u/JustBacWater

GHK-Cu is one of the most searched compounds in the space, mostly for skin and hair research, and it works differently from every other skin ingredient it gets compared to. It's also one of the few here with real dermatology data behind it. Research framing throughout, so here's the rundown.

What sets it apart from retinoids and vitamin C is the target. Those push tissue to produce more collagen. GHK-Cu doesn't. It signals tissue to organize the collagen already present. That distinction matters, because aging skin isn't only short on collagen, the collagen it has is disorganized, microcirculation is reduced, and cells sit in a defense state rather than a repair one. GHK-Cu shifts that balance. Microarray work shows it moving expression across more than 4,000 genes, pulling cells out of damage response and into organized repair. The reported result is tissue that reads structurally firm rather than temporarily plumped.

Part of why it behaves this way is that it isn't foreign. GHK is a tripeptide the body produces on its own for tissue maintenance, and plasma levels fall roughly 60% between age 20 and 60. That decline parallels the age-related drop in wound healing capacity, which is why it's studied as a compound that restores a signal lost over time rather than one that introduces something new.

There are two routes in the research, and they reach different depths. Topical formulations reach the epidermis and shallow dermis, the layer relevant to fine lines, texture, and the surface of scar tissue, and topical is typically applied daily or nightly. Injectable reaches the deeper dermis and soft tissue, the layer relevant to structural firmness, lax zones, and thicker scars, and injectable protocols run 2 to 3 times weekly rather than daily. The cheat sheet reflects that split. The reasoning given for the lower injectable frequency is a narrow signaling window, where the remodeling phase happens between applications and constant stimulation can bias tissue back toward inflammation.

Phase	Dose	Frequency
Weeks 1 to 2, assess	1 mg	2x per week
Weeks 3 to 8, active	1.5 to 2.5 mg	2 to 3x per week

On reconstitution, 4 mL of bacteriostatic water into the 100 mg vial yields 25 mg/mL, so 1 mg is 0.04 mL, 2 mg is 0.08 mL, and 2.5 mg is 0.1 mL. A 50 mg vial takes 2 mL for the same concentration. The reconstituted solution turns blue from the copper complex, which is the expected appearance and not a sign of anything wrong. Application is subcutaneous into the deeper dermis, not intramuscular, and a regional grid pattern around a target area is used rather than a single site. Topical research concentrations run 0.1 to 0.3% for facial work and 0.5 to 2% for scar or scalp work over 8 to 12 week courses, with hair timelines closer to 3 to 6 months.

A substrate note that comes up throughout the research: GHK-Cu functions as an organizing signal, and a signal can't build matrix without raw material. Adequate protein supplies the collagen building blocks, vitamin C serves as a cofactor, and stable sleep supports the repair environment. Protocols that ignore substrate tend to underperform regardless of dose.

On timelines, the observed sequence is texture and hydration shifts by weeks 2 to 4, fine line softening by weeks 4 to 8, and structural firming and mature scar changes by weeks 8 to 12. Hair endpoints run longer at 3 to 6 months and pair better with minoxidil or microneedling than as a standalone. On evidence, GHK-Cu sits on firmer ground than most cosmetic peptides, supported by gene expression data, decades of study, and its status as an endogenous compound, which is a stronger footing than the mouse only data behind much of the sheet.

Contraindications worth noting in any protocol: copper handling disorders such as Wilson's disease, since the compound adds copper load, active malignancy in the treatment area, and pregnancy, where safety data is absent. Total copper load should be accounted for when other copper containing products are in use.

GHK-Cu remains a research compound and everything above is research context only.

curious how people are approaching GHK-Cu in their research, injectable or topical, and what the timeline looked like

Full doses and the topical breakdown are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

Epitalon is the one people run for longevity and telomeres, and it also has the widest gap in this whole space between what's genuinely proven and what gets claimed about it. The mechanism is real and now independently confirmed. The dramatic lifespan numbers are not. Both of those are true at the same time, so here's the honest rundown.

It's a tiny four amino acid peptide built off an old bovine pineal extract, developed by the Russian gerontologist Vladimir Khavinson. It goes after two aging mechanisms at once: telomere shortening, by switching on telomerase, and circadian breakdown, by restoring your pineal melatonin production. That second one is why the first thing people notice is sleep, usually better sleep quality inside the first week or two. Set expectations here though, you won't see or feel anything dramatic, no skin or hair transformation. Better sleep is the near term signal that it's doing something, and the rest is a long bet.

The interesting part is how it works, and why the dosing looks so strange. Epitalon is small enough to slip into the cell nucleus and bind DNA right at the telomerase gene, turning up hTERT, the catalytic engine of telomerase. In cell studies that produced real telomere lengthening, around a third longer in cultured human cells. And the dose response runs backwards from what you'd expect. It works best at extremely low concentrations, and piling on more does nothing. That's the tell that it's an epigenetic signal, it flips a switch that stays flipped rather than a drug you keep topped up. Which is exactly why you run it in short courses instead of daily. Ten to twenty days triggers changes that last months.

Here's the part to be straight about, because it's where this compound lives or dies. The mechanism is real and, as of 2025, confirmed outside Russia for the first time, a Brunel University study reproduced the telomerase activation in human cells. That matters, because for 40 years nearly all the research came from Khavinson's own institute. What has not been confirmed is the big stuff, the famous longevity figures like a four fold drop in mortality. Those come from that single group, they've never been replicated, and the institute holds close to 200 patents on this class, so there's real commercial motivation sitting behind the claims. So the honest position is simple: the cellular mechanism is proven, the human life extension is not. Run it knowing you're making a mechanism based bet, not following settled science.

Protocol	Daily dose	Duration	Cycle
Standard	10 mg	10 days	every 4 to 6 months
Extended	5 mg	20 days	every 4 to 6 months
Khavinson original	10 mg every 3rd day	5 doses	every 4 to 6 months

Both the 10 day and 20 day options add up to the same 100 mg per cycle, so pick whichever you'd rather run. Dose it in the evening, 1 to 2 hours before bed, because it works through your pineal and melatonin rhythm and morning dosing throws that timing away. For the draw, mix the 10 mg vial with 1 mL of bac water for 10 mg/mL, so 10 mg is 1 mL and 5 mg is 0.5 mL. That 1 mL is a biggish subcutaneous (SC) shot, which is part of why a lot of people run the 5 mg for 20 days version instead, since it halves the nightly volume. Most people do 2 to 4 cycles a year, and going higher doesn't help, it was tested up to 50 mg a day with no added benefit, which fits the low concentration mechanism.

One thing to address head on, since it always comes up. Switching on telomerase sounds alarming, because telomerase is exactly what lets cancer cells become immortal. Fair concern. The wrinkle from that 2025 study is that Epitalon seems to do the opposite in cancer cells, inhibiting telomerase there and pushing a different pathway, which may be why animal studies saw fewer tumors despite the telomerase activation elsewhere. That's genuinely promising, but it hasn't been validated in humans, so the rule holds: do not run it with active or suspected cancer. Same for pregnancy, breastfeeding, and known immune issues, since none of that has safety data behind it.

Side effects are mild in practice, some injection site reactions, occasional fatigue or drowsiness that passes in a few days, and sometimes vivid dreams from the melatonin and REM effect, which most people take as a good sign. The bigger caveat is at the system level: it's FDA Category 2 as of 2024, so it can't be legally compounded here, it's research only, and a 2025 review flagged that the core safety data, long term effects, immunogenicity, drug interactions, simply hasn't been studied properly. So the near term tolerability looks fine and the long term picture is honestly unknown.

if you've run Epitalon, did your sleep change in the first couple weeks, since that's supposed to be the tell, or did you run it purely on the telomere theory and feel nothing. curious which camp people land in

Full doses and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

So I feel like this quietly splits everybody in here. Half of you pull a full panel before and after every cycle and won’t touch anything blind. And then the other half have been running stuff for years going purely off feel and have never once looked at a lab. And nobody thinks the other side is doing it right.

So where do you actually land. Labs every time, or you feel it out and adjust as you go. And if you’re in the by feel camp, has it ever caught up to you, or has winging it just been fine so far.

I go by feel more than I probably should, so I’m genuinely curious how the split looks.

5-Amino-1MQ gets filed under fat loss, but it pulls a completely different lever than everything else in that category, and there's one sourcing detail that decides whether it does anything at all. Worth saying up front too: it's a small molecule, not a peptide, and it's oral first, so no needle required. Here's how it works and how to run it.

Everything popular for fat loss right now works on appetite. GLP-1s, tirzepatide, all of it turns down how much you eat. 5-Amino-1MQ does none of that. It doesn't touch your appetite. It changes what your fat cells do with the energy they're holding. So it's a different tool aimed at a different part of the problem, and it stacks with the appetite compounds instead of competing with them.

The target is an enzyme called NNMT that sits inside your fat cells and gets more active the more fat you carry. NNMT quietly drains nicotinamide, which your cells need to make NAD+, the fuel that runs your mitochondria. When fat cells are starved of NAD+, their mitochondria stall and the cell defaults to storage mode, holding fat instead of burning it. 5-Amino-1MQ blocks NNMT, which lets that nicotinamide flow back into NAD+ production inside the fat cell, restarts the mitochondria, and flips the cell from storing energy to spending it. That's also why it's not the same as NMN or NR. Those add more raw material into the system, this one stops the leak of the material you already have, which is why people run them together.

Here's the detail that decides whether your vial does anything, and it's behind a huge share of the "this did nothing" posts. 5-Amino-1MQ comes in two salt forms, chloride or iodide, and they are not equal. The chloride form is about 83% active compound per mg. The iodide form is only about 58%. So a 150 mg iodide dose is really only about 87 mg of active, while 150 mg of chloride is about 125 mg. That's a 44% gap between two things labeled the same dose. Buy the iodide form, run a normal dose, and you're quietly underdosed the whole time. Confirm your source is the chloride salt before you worry about anything else.

Weeks	Daily dose	Timing
1 to 2, tolerance	50 mg	Morning only
3 to 6, active	100 to 150 mg	Morning only

Oral capsules, once in the morning, and only the morning. Dose it late in the day and you'll get insomnia, but that one isn't a side effect to fear, it's the mechanism working, your cells have more energy because NAD+ and mitochondrial activity are up. The fix is earlier timing, not a lower dose. Cycle 4 to 6 weeks on, then 8 to 12 weeks off, because NNMT lives in your liver too and there's no long term human safety data, so the cautious cycling is on purpose. There's an injectable version if you'd rather, running roughly 500 mcg to 3 mg a day, but it's less common and less documented than the oral, and oral is the primary route here anyway, so most people just take the capsule.

Be realistic about who it works for, because the response is polarized. In community reports it splits into rough thirds: about 40% get a clear benefit, about 40% feel nothing, and about 20% get a strong response. The people who respond tend to already be leaner, under about 15% body fat, with training and nutrition dialed in, and running the chloride salt. Higher body fat and the iodide form line up with the people who get nothing. So this isn't a rescue for a rough starting point, it targets a bottleneck that only matters once the basics are handled. When it does work, energy and endurance show up first in the first week or two, since that's the upstream mitochondrial effect, and the body composition change is downstream and shows up around weeks 4 to 6.

On the evidence, here's the straight version. There are no published human trials, none, all of it is preclinical. The mouse data is genuinely interesting. One Nature paper knocked down NNMT and the mice resisted getting fat on a diet built to make them obese, without eating less or losing muscle, and a later study showed 5-Amino-1MQ itself cut fat mass in obese mice by raising fat cell energy expenditure. But that's mice, and long term human safety is simply unknown. It hasn't been approved for human use and it's research only, so purity and salt form ride entirely on your source.

Side effects are mostly mild. Headaches in the first week are the most common and usually pass, some irritability at higher doses, and the insomnia if you dose too late. The injectable can sting a bit from the compound's structure. The real caution is the unknowns, so it's an avoid in pregnancy, breastfeeding, active cancer, or if your liver is compromised, since NNMT sits in the liver too.

if you ran 5-Amino-1MQ, did you check whether it was the chloride or iodide salt, and were you in the third that felt it or the third that got nothing. curious how the split looks in here

Full doses and the injectable protocol are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

If you've watched vendors quietly pull Reta from their catalogs this week, this is why. On August 12 Eli Lilly filed six federal lawsuits and made a public push to choke off the whole gray market retatrutide supply chain. Here's what happened past the panic.

What Lilly did:

• Filed six federal lawsuits in one shot, and the mix is the tell. Four of the six are research peptide sellers running the "research use only" model, alongside a med spa and a compounding pharmacy.
• Took the research supply channel to court by name for the first time, instead of just referring sellers to regulators like before.
• Went after the infrastructure too, publicly calling on payment processors, credit card companies, shipping carriers, and the online platforms to cut these sellers off.
• Flagged over 14,000 listings across 100+ countries and referred 200+ people and entities to the FDA, DOJ, and state attorneys general, with customs already seizing far more than it used to.

The core of the lawsuits is the claim that "research use only" is a fig leaf. Lilly's argument is that vendors put RUO on the label while selling it knowing full well it's going into people, and that the label doesn't make the sale legal when the intent is human use. The FDA already said back in June that unapproved retatrutide sold to consumers is illegal and can't be compounded. So the RUO shield the whole market leans on is being tested in a courtroom for the first time.

And none of this means Reta is junk, it's the opposite. Lilly's own trials have people losing around 28% of their body weight, it might be the strongest thing in the class, and they plan to file for FDA approval in early 2027. The crackdown is happening because it works and demand is running years ahead of approval. They're clearing the field before they launch a blockbuster.

What it means if you research Reta:

• Supply tightens and prices move. More vendors will drop it the way the first ones already have.
• The quality and legal risk is real, and it's Lilly's own main point, that nobody is checking what's in an unregulated vial.
• The "research use only" framing everyone leans on is now live in court, so it's worth sitting with no matter where you land.

You can read Lilly's motive two ways and both are probably true at once. They've got a real safety argument, since no regulator has cleared this and nobody vets a gray market vial, and they've got an obvious financial motive in protecting a drug about to be worth billions. Those don't cancel each other out.

So where do you land. Is this Lilly protecting patients, protecting profit, or just the end of the window before approval that everyone knew was closing. And if you research Reta, does any of this change what you do.

If you read the BPC-157 post, this is the other half of the pair. TB-500 is what most people stack with BPC, but it solves a different problem, it's dosed completely differently, and there's a labeling quirk that means the vial in your fridge is probably not the exact molecule on the label. None of that is a problem once you know it, so here's the rundown.

The clean way to think about the two: BPC-157 builds the roads. It restores blood flow and gets circulation back into damaged tissue. TB-500 handles the traffic on those roads. It gets the repair cells to migrate into the injury and organize into proper tissue instead of scar. Perfusion plus movement. That's why they get run together as the Wolverine stack, and why either one alone leaves half the job done: blood flow with no cells showing up, or cells with no supply lines. They also inject together in one syringe fine.

The way it works is what changes the whole dosing approach. TB-500 grabs onto actin, the protein cells use to physically move and reshape themselves. It ties up a reserve pool of actin that cells can pull from to migrate, divide, and rebuild quickly. The important part is that this is a one to one binding job, not a catalyst, so you need a big milligram dose to bind enough actin to matter. Once that reserve is built, the effect lasts for days even though the peptide itself is gone from your blood in a couple hours, because the actin pool just sits there until the cell draws on it.

So here's the consequence, and it's the single most common way people run it wrong. Unlike BPC-157, which you pin in small doses every day, TB-500 is not a daily peptide. You run 2 to 4 mg two or three times a week. Small daily doses never hit the binding threshold and mostly just waste the compound.

Phase	Dose	Frequency	Weeks
Loading	2 mg	Mon and Thu	1 to 4
Loading, big acute injury	4 mg	Mon and Thu	1 to 4
Maintenance	2 to 4 mg	1 to 2x weekly	5 to 8

For drawing it, mix the 10 mg vial with 1 mL of bac water for a clean 10 mg/mL, so 2 mg is 0.2 mL and 4 mg is 0.4 mL. It goes in subcutaneous (SC) or intramuscular, near the injury when you can reach it. It doesn't stay local, it enters circulation within minutes no matter where you put it, but injecting near the injury gives a higher concentration spike right where you want it before it dilutes out, and that first pass matters. In repair studies, the same total dose delivered systemically came up empty where targeted delivery worked. For a deep injury you can't reach, belly or thigh is the fallback. Run 6 to 8 weeks, then take 4 to 8 weeks off. This is a repair signal, not a maintenance compound, so grinding it forever just gives you diminishing returns.

Now the part almost nobody tells you. The name TB-500 originally meant a small 7 amino acid fragment. But most vials sold as TB-500 are the full length parent molecule, TB-4 (thymosin beta-4), which is 43 amino acids. Doping labs have tested commercial vials and confirmed it. This mostly doesn't matter, both heal tissue, but there's one real difference: the full TB-4 molecule carries an extra segment that fights scar tissue (the antifibrotic part) that the short fragment simply doesn't have. So if reducing scar is the goal, you want the full TB-4, which, conveniently, is what's usually in the vial anyway. If you want to know which one you've got, check the certificate of analysis. Around 4,900 daltons or 43 amino acids means it's TB-4. If the COA doesn't say, assume TB-4.

It's slower to work than BPC-157. The first week or two you'll notice morning stiffness and first step pain easing off, weeks 3 to 4 your range of motion opens up, and weeks 5 to 8 you can start tolerating real loading again. On the evidence, the strongest human data point is a Phase 3 trial in corneal healing where it beat placebo hard, around 60% complete healing versus about 12% on placebo, and that one carries weight because the cornea has no blood vessels, so the healing had to come from direct cell action rather than improved blood flow. There's also a Phase 1 safety trial that turned up no serious adverse events. Fair caveat though, those trials used pharmaceutical recombinant TB-4, not the synthetic material in most vials, so it's the closest reference we have, not direct proof of what you're buying.

Side effects are mild, occasional injection site reactions and some people get a bit of lethargy for a day, so hydrate and pin it before a rest day. The hard stops are the same as BPC and for the same reason: no active cancer or cancer in the last couple years, since it promotes blood vessel growth and cell migration, no pregnancy, and stay cautious around surgery. It's WADA banned under S0 and it's detectable, so anyone tested for sport should stay off it.

if you've run TB-500, did you check the COA to see whether it was TB-4, and are you dosing it twice a week or did you fall into pinning it daily like BPC. curious how people are running it

Full doses and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

IGF-1 LR3 is about as direct as anabolic signaling gets, which is exactly why it's both effective and one of the more serious tools on the list. Most growth compounds work upstream and ask your body to make more of its own signal. This one is the signal, engineered to stick around. So the upside is real, and the two big risks are real too. Here's the straight version.

Normally your growth hormone tells your liver to make IGF-1, and IGF-1 is what drives a lot of the actual muscle growth. Native IGF-1 only lasts minutes in your blood. LR3 is IGF-1 with a modification that stops it from getting mopped up by its binding proteins, which stretches its life from minutes to hours and lets it circulate freely. So it skips the whole growth hormone to liver step and puts the growth signal straight onto the IGF-1 receptor, all day long. That direct, all day signal is why it's potent, and it's also the root of both problems below.

The first real risk is your blood sugar. IGF-1 is close enough to insulin that it acts on your glucose like a mild insulin would, and it can pull your blood sugar down. The symptoms sneak up on you, shaky, sweaty, foggy, dizzy. That's why the rule is to always dose it with food, never fasted, and keep fast carbs like glucose tabs or juice within reach during a cycle, especially while you're titrating up. This isn't a maybe. It's the single most reported issue and the one that lands people in actual trouble.

The second one people underrate. IGF-1 is a general growth and cell proliferation signal, and it doesn't only find muscle. A strong, sustained IGF-1 signal acts on other tissues too, and because it pushes cells to grow and divide broadly, running it high or forever is where the real long term concern lives, organ growth and the proliferation risk that comes with any potent growth factor. That's the whole reason the dosing stays capped. It's not that 50 mcg is a magic number, it's that above roughly 50 to 60 mcg you leave what little research exists behind and pile on risk for not much more return.

Weeks	Daily dose
1 to 2	20 mcg
3 to 4	40 mcg
5 to 8	50 mcg

For drawing it, mix the 1 mg vial with 1 mL of bac water. That's 1 mg/mL, or 1000 mcg/mL, so 20 mcg is 0.02 mL, 40 mcg is 0.04 mL, and 50 mcg is 0.05 mL. It goes in subcutaneous (SC), once a day, with food, in the morning or post workout. Titrate up over the first few weeks instead of starting at the top. These are small volumes, so if you want them easier to read you can mix with 2 mL instead, which makes it 500 mcg/mL and turns 50 mcg into 0.10 mL, just remember the water only changes the volume, never the dose.

Run it 8 weeks on, then 4 to 8 weeks off. Past about 6 to 8 weeks the receptor starts tuning out and the effect fades, so there's no point grinding it nonstop, and the time off doubles as a break from the risk load.

On whether it's worth it, IGF-1 LR3 has genuine firepower, but it only pays off if the rest is dialed in, hard resistance training and enough protein, because it amplifies the growth response to mechanical loading rather than building muscle out of nothing. Sit on the couch and run it and you get all the risk and none of the reward. It's also never been approved for human use in this form, so it's research only and purity comes down entirely to your source. Between the blood sugar management, the growth signal that doesn't discriminate, the short useful window, and the no-approval status, this is a serious tool, not a casual add-on. Respect it and it's powerful. Get cavalier with the dose and it's the kind of thing that bites.

if you've run LR3, where did you keep the dose, and did the blood sugar drop ever catch you off guard. curious how people handled the hypo side

Full doses and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

I currently have the FX3 and FX6. I don’t do any video editing. I mainly use these cameras to broadcast to a live stream. It was wondering if the FX5 would be a great add-on or just not necessary or should I upgrade that fx3.

Kisspeptin gets talked about like a natural test booster you can run without shutting yourself down, and the mechanism behind that reputation is real. But it comes with a big condition almost nobody mentions: it only works if your hormone axis is already intact. Here's what it does and who it does nothing for.

To get why it's different you have to know where it sits. Your testosterone runs on a chain. Your hypothalamus releases GnRH, GnRH tells the pituitary to put out LH and FSH, and LH and FSH tell your testes to make testosterone. Kisspeptin sits at the very top of that chain. It binds a receptor called GPR54 on the GnRH neurons in your hypothalamus and tells them to fire. So instead of adding testosterone from outside the way TRT does, or poking the testes directly the way hCG does, it turns up your own signal at the source. That's the entire appeal. It raises your testosterone and estrogen by amplifying your own LH and FSH, and because it works through your system instead of overriding it, it doesn't suppress the axis the way TRT does.

Here's the part that gets left out. Kisspeptin is completely dependent on the rest of that chain working. It does not make testosterone. It sends a signal down a line, and if the line is broken, nothing comes out the other end. Block GnRH and kisspeptin does nothing at all. So if your problem is downstream, blown out testes, a pituitary that won't answer, primary hypogonadism, this is the wrong tool, because you're pressing a button wired to nothing. Where it makes sense is when the machinery is fine but the signal has gone quiet: a hypothalamus dialed down by stress, very low body fat, or overtraining, that kind of functional suppression. It's a nudge for a working system that's underperforming, not a repair for a broken one.

One more thing worth knowing, because it's the real open question with daily use. Your body doesn't release this signal in a steady stream, it pulses it. And receptors that get hit by a constant signal tend to adapt and stop listening, which is a known issue across this whole GnRH area. The protocol below is once daily, and the acute stimulating effect is well documented, but how well a steady daily dose holds up over weeks, versus the receptor slowly tuning it out, isn't settled. Cycling it and not running it forever is the sensible hedge until that's clearer.

Weeks	Daily dose
1 to 2	100 mcg
3 to 8, or 3 to 12	200 mcg

It goes in subcutaneous (SC), once a day, rotating sites. Start at 100 mcg for the first two weeks to see how you respond, then step to 200 mcg. Courses run 8 to 12 weeks.

For drawing it, mix the 10 mg vial with 1 mL of bac water. That gives you 10 mg/mL, which keeps the math easy: 0.01 mL is 100 mcg and 0.02 mL is 200 mcg. If you like a bigger, easier to read volume you can use more water, just remember it only changes the concentration, not the dose. Whatever you mix, the dose in mcg is the only thing that matters.

On the evidence, here's where the real human data lives: reproductive medicine. It's been used to restart cycles in women whose periods stopped from hypothalamic suppression, and as an ovulation trigger in IVF, where it carries a lower risk of ovarian hyperstimulation than the standard hCG trigger. It reliably raises LH, FSH, and the sex hormones downstream in humans. The male performance use, running it to bump testosterone or libido, is a reasonable read of that same mechanism, but it's an extrapolation, not a pile of male muscle or testosterone trials. Set expectations there accordingly.

Side effects are mild in the trials, mostly just injection site stuff, some redness or itch. The bigger thing to respect isn't really a side effect, it's the responder question from earlier: matching the tool to whether your axis is actually the thing that's intact.

if you've run kisspeptin, did your bloodwork move, LH and total T, or did it read like nothing. curious how it went for people using it for T versus the fertility side

Full doses and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

MOTS-c gets sold as exercise in a syringe, and that's half true in a way that trips people up. It copies the metabolic signal your body sends during a hard workout, but not the physical work itself, so it's a training amplifier, not a substitute for one. And it's picky about who it helps, which is the part almost nobody sets expectations around. Here's the rundown.

It's a strange one to start with. MOTS-c is a 16 amino acid peptide your own mitochondria make. Most peptides are coded in your nuclear DNA, this one comes out of mitochondrial DNA, which puts it in a small class called mitochondrial derived peptides. Your cells naturally release it when they sense demand, meaning hard exercise or fasting, and it travels to the nucleus and reprograms gene expression: burn more fat, spare glycogen, pull glucose in without needing extra insulin, and build new mitochondria over time. The key word is reprogram. A stimulant whips a tired system for more output. MOTS-c tells the system to run differently. Your own levels fall with age and sit lowest in people with insulin resistance.

Now the part that decides whether it's worth your money. MOTS-c does the most for people whose metabolism is already struggling, insulin resistant, sedentary, older, or on a GLP-1 and dragging with fatigue. If you're already lean and metabolically dialed in, the signal shows up to a system that's already doing what it's being told, and you might feel close to nothing. It fills a metabolic gap. It's not a bonus for people who don't have one.

Here's the single most reported problem, and it's a dumb one to get burned by, literally. You have to reconstitute MOTS-c with isotonic bac water, the kind with 0.9% saline in it. Mix it with plain bac water and you get sharp burning, welts, and lumps at the injection site that last for hours, nearly every time. Isotonic fixes it completely. This catches more first timers than anything else about the compound, so sort the water out before you sort anything else.

Timing matters because it acts over hours, not weeks. The move is a morning dose 60 to 90 minutes before Zone 2 cardio, so the exercise mimetic signal lands right when you're training. That's where the synergy actually shows up.

Phase	Dose	Frequency	Timing
Assess, week 1	5 mg	Once weekly	Morning, fasted
Standard	5 to 10 mg	1 to 3x weekly	60 to 90 min pre-cardio
MTHFR carriers	2 to 3 mg	Once weekly	With methyl donors
Long course	10 mg	Once weekly	up to 10 weeks

Reconstitute 3 mL of isotonic bac water into the 10 mg vial and you're at 3.33 mg/mL, so 5 mg is 150 units, or 1.5 mL, which runs past a standard insulin pin so you either use a bigger syringe or split it. It goes in subcutaneous (SC). Run it 4 to 6 weeks on, 2 to 4 weeks off, because that mirrors how your body uses it, in pulses tied to demand rather than constant. And more is not better here, higher doses don't scale the effect up.

One real safety wrinkle. MOTS-c works partly by jamming the folate cycle, which is what drives the AMPK activation you want, but that same block drops your methylation side. If you carry an MTHFR variant, C677T or A1298C, you can crash harder than most people. If that's you, start low at 2 to 3 mg once a week and run methylfolate, methyl B12, and glycine alongside it starting a week early. If the crashes keep coming, just stop.

On the evidence, keep the hype in check. Most of the human data is correlation: athletes carry higher MOTS-c, higher levels track with better insulin sensitivity, levels fall with age. The intervention data in actual humans is thin. And the flashy number you'll see quoted, someone going from 18% to 15% body fat in 15 days with no change in diet or training, is a single unverified anecdote with nothing behind it, so don't set your expectations there. Same goes for the claim that it degrades 50% two hours after mixing, single source, unverified, most people refrigerate and run it normally without an obvious drop-off.

Side effects are mild. The injection burning is the big one, and it's a water problem, not a MOTS-c problem, fixed by isotonic. Some people feel a little fatigue or a crash on the first few doses as the metabolism shifts. Don't draw it into the same syringe as a GLP-1, they precipitate together, so inject them separately at different sites. And it's WADA banned as of 2025, so anyone tested for sport should stay off it.

if you've run MOTS-c, did you use isotonic from the start or learn the hard way. and did you feel much, or were you already too dialed in for it to do anything

Full doses and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

DSIP (delta sleep inducing peptide) is the one people reach for when they want a peptide for sleep, and it's also the one most people misread. It is not a sleeping pill. It will not knock you out. If you're expecting an Ambien in a vial you'll be let down and probably decide it's junk. What it does is a different thing, and whether it works for you comes down to conditions most people never bother to check.

Unlike the Ambien class of sleep drugs and benzos, which force GABA receptors open and drop you while chewing up your REM, DSIP nudges your brain toward deeper slow wave sleep without sedating you, without suppressing REM, and without overriding your ability to wake up if you need to. It moves the quality of sleep, how deep and restorative it is, more than the quantity. A lot of responders say it doesn't make them sleep longer, it makes the sleep they already get hit harder, and they wake up with better stress tolerance the next day.

Here's the part that makes or breaks it. DSIP is circadian dependent. It amplifies sleep pressure that's already building, it doesn't manufacture sleepiness out of nothing. Take the same dose in the middle of the afternoon and basically nothing happens. So it's useless as a take it whenever knockout, but genuinely useful when your sleep depth has been trashed by stress, travel, or a wrecked schedule while your basic day and night timing is still roughly intact. If your circadian rhythm itself is the problem, shift work, a fully flipped schedule, fix that first, because DSIP has nothing to grab onto.

Which leads to the other rule: this is a layer on top of the basics, not a replacement for them. Morning light soon after waking, caffeine gone by early afternoon, a cool dark room, no big meal right before bed. If those aren't handled there's no sleep pressure for DSIP to deepen and you're wasting the vial. Foundations first, peptide second.

Nights	Dose	Units	Timing
1 to 3, assess	100 mcg	6 units	30 to 60 min pre-bed
Standard	150 to 200 mcg	9 to 12 units	30 to 60 min pre-bed
Max, only if needed	300 mcg	18 units	60 to 90 min pre-bed
2 nights a week	off		keeps it responsive

Reconstitute 3 mL of bac water into the 5 mg vial and you're at 1.67 mg/mL, so 100 mcg is 6 units. It goes in subcutaneous (SC), 30 to 60 minutes before bed. Start at 100 and only climb if you're still taking more than 30 minutes to fall asleep. Most people settle at 100 to 200, and 300 is the ceiling. Run it 5 nights on, 2 off, because back to back nightly use loses its edge, which reads like desensitization, and the two off nights keep it working. Courses go 8 to 12 weeks, then 4 to 8 weeks off. Nobody has studied running it nonstop.

Now the part you won't get from a vendor. Roughly half the people who try DSIP get nothing from it. That's a practitioner estimate that keeps turning up, and nobody knows whether it's dosing, timing, individual neurochemistry, or bad product. The human research is thin and old, small European trials from the 80s and 90s, some of them positive with deeper slow wave sleep and fewer night wakeups, and at least one solid double blind trial that found no change at all. And after 40 years of study, nobody has even confirmed which receptor it binds. So this is a genuinely interesting compound that also has a real chance of doing nothing for you specifically. Go in with that expectation and you won't feel scammed if you're in the half it skips.

Side effects are mild. The most common one is morning grogginess at higher doses, and the fix is to either drop the dose or take it earlier, 60 to 90 minutes before bed instead of 30. Some people get vivid dreams, which are harmless, the occasional headache, and if you're sedated and foggy the next day that's your signal you took too much, so pull it back 50 to 100 mcg. Two hard rules. Don't stack it with the Ambien class, benzos, or alcohol, the mechanisms overlap and you're just adding risk. And it does nothing for sleep apnea or restless legs, those are structural and movement problems that need their own fix, not a sleep architecture peptide.

if you've run DSIP, are you one of the people it worked for or one of the coin flips that got nothing. curious how the responder split looks in here

Full doses and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

What is the best travel bag? I know there isn't truly a best one because that's all personal preference, but what is a bag that you personally like and think is the best for the FX6 to travel with? I have seen two that I personally like, but I am not sure how they hold up on a plane. One of them was the schlep dr. Bag. The other one was the sakk pack do any of you have any of these? How do you like them? I haven't traveled with my FX6 yet. Normally, I use my FX3 in a Pelican. As a carry on

ARA-290 (cibinetide) is one of the more interesting ones once you know where it came from. It's built out of EPO, the same hormone endurance guys dope with to pump up red blood cells, but engineered to keep only the tissue repair half and throw away the blood cell half completely. So you get EPO's protective, anti-inflammatory side with none of the blood thickening. And it's specific in a way most of these aren't. It's a nerve pain tool, not a general healing peptide, and that distinction is the whole thing.

The way it works is what makes it stand out. It activates the innate repair receptor, which is a receptor that basically only shows up where tissue is injured, inflamed, or under metabolic stress. In healthy tissue that receptor is mostly not there, so ARA-290 has nothing to grab onto and does nothing useful. It needs damage to act on. That's why it's pointless as a general feel-good peptide and only earns its keep when there's actual nerve injury to work on. Where there is, it calms the inflammation and pushes small fiber nerve regeneration.

Then there's the weird part. It clears your blood in about 20 minutes off a subcutaneous shot. But the effects last for months. It behaves like a switch, one dose flips the repair program on and the cell keeps running it long after the drug is gone. In the sarcoidosis trials, benefit was still measurable nine months after the last dose. So you're not holding a blood level like most peptides, you're triggering a process and letting it run.

Here's the part people get wrong, so read this before you buy it. This is for nerve pain, full stop. Good fit is the nerve stuff: burning, tingling, electric or shooting pain, touch sensitivity where light contact hurts, numbness in a nerve territory, weird temperature or sweating changes. Bad fit is mechanical pain: deep ache, soreness, joint pain, swelling, stiffness. That mechanical stuff is BPC-157 and TB-500 territory. Aim ARA-290 at the wrong kind of pain and you've burned a whole course for nothing.

Dosing is refreshingly simple:

Course	Daily dose	Route	Length
Standard	4 mg	SC, rotating thigh sites	28 days
Extended	4 mg	SC	up to 12 weeks
Repeat, if it comes back	4 mg	SC	28 days, months later

The dosing data is unusually clean. 1 mg was too low to do anything, 4 mg worked, and 8 mg added nothing over 4. More is not stronger here, so there's genuinely no reason to climb past 4 mg. Reconstitute 5 mL into the 16 mg vial and you're at 3.2 mg/mL, which puts 4 mg at 125 units, or 1.25 mL. That runs past a standard insulin pin, so either split it into two shots or use a 1 mL syringe. Use isotonic bac water, the kind with saline in it, because it stings less. And give it its own syringe, don't mix it with other peptides.

On the evidence, here's the honest state of it. The real human data is Phase 2 in sarcoidosis small fiber neuropathy and in painful diabetic neuropathy. It showed objective nerve regeneration, actual corneal nerve fiber measurements going up, not just people saying they felt better, along with symptom improvement. It holds FDA Fast Track and Orphan Drug status for sarcoidosis. What it never did is reach Phase 3, and the developer has been dormant since 2020, so this is a compound that stalled commercially, not one that failed in the lab. Being straight though: in one trial the pain score got washed out by a big placebo response even while the nerve markers improved, total human exposure is small, and there's no approved product anywhere, so purity comes down entirely to your source.

Safety reads well. Side effects are mild, some injection site irritation, the occasional headache or fatigue, running about the same as placebo across trials. The real payoff of the design is that hemoglobin, hematocrit, and platelets didn't budge in any human trial, so you don't get the clotting risk that comes with actual EPO. The honest caveats are one possibly related kidney marker worsening in the diabetic trial and one case of suicidal ideation in the high dose arm. Small numbers, but they belong in the accounting.

Set expectations right too. Nerve regeneration is slow. People tend to notice symptom change in the first week or two, most of the measurable improvement builds over the month long course, and it can keep improving for a while after you stop.

if you've run it, what were you aiming it at, and did the nerve pain shift or was it a wash. curious how it did outside the sarcoidosis and diabetic cases it was actually studied in

Full doses and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

Reta is the one everyone's watching right now, and for good reason, the weight loss numbers out of the trials are the biggest anyone's ever published. It's also the newest of the bunch and the least understood, and the part almost nobody explains right is that the dose doesn't just make it stronger. It changes which part of the drug is doing the work. Once that clicks the whole thing makes more sense, so here's the rundown.

Retatrutide is one molecule that hits three receptors: GIP, GLP-1, and glucagon. Tirzepatide hits the first two. That third one, glucagon, is the entire difference, and it's the reason liver fat, triglycerides, and heart rate all move harder on reta than on semaglutide or tirzepatide. So it's less a stronger GLP-1 and more a GLP-1 with a whole extra system bolted onto it.

Here's the dose thing. At a low dose, reta is mostly working the GIP receptor and throwing off a liver fat signal, with barely any appetite effect and basically no heart rate cost. As you climb, the GLP-1 side takes over and that's when the appetite suppression kicks in. Only near the top does the glucagon arm fully engage, and that's where you get the biggest liver fat reduction, but it's also where the heart rate cost lives. So a 1 mg dose and a 12 mg dose aren't the same drug turned up louder. They're doing genuinely different jobs.

You don't jump between these doses week to week. You pick a rung, sit on it for a few weeks so your body settles into it, then step up. That last column is how long to stay on each dose before moving up.

Weekly dose	What it's mostly doing	Stay here before moving up
0.5 mg	GIP plus a light liver signal, no HR cost	4 weeks
1 mg	GIP near saturated, glucagon still quiet	4 weeks
2 mg	Appetite suppression establishes	4 weeks
4 mg	GLP-1 climbing, glucagon crosses threshold	4 weeks
8 mg	around 94% of the full effect	4 weeks
12 mg	max glucagon, biggest loss, highest HR cost	top dose, nowhere left to go

Reconstitute 2 mL into the 10 mg vial and you're at 5 mg/mL, so 1 mg is 20 units and 8 mg is 160 (split that one up). That table is the trial group obese ladder. If you're lean and metabolically healthy you run a lower one, roughly 0.3 to 4 mg, and I'll come back to why.

The number most people should care about is 8 mg. Half the maximum effect is already there by 4 mg, and 8 mg gets you about 94% of what 12 mg does. Past 8 you're paying a lot more drug and a lot more side effect for a small bump. Chasing 12 makes sense for the deepest responders, but most people leave very little on the table by stopping at 8.

The single rule that keeps people out of trouble is that hold time in the table: stay on each dose at least 4 weeks before stepping up. It hangs around about six days in your blood, which means a new dose doesn't even reach steady levels for roughly three weeks, so if a step is going to give you problems it usually shows up after you've already moved to the next one. Climb faster than the four weeks and that's how people end up nauseous the entire cycle. Go slow and the nausea fades a couple months in. How fast you climb matters more than where you end up. And once you reach the dose you're going to run, whether that's 8 mg or the full 12, you just stay there. That's the maintenance dose, the one you hold long term instead of stepping up from.

Now the lean warning, because this is the part that gets glossed over. The glucagon arm raises your resting heart rate. In the trial group it ran about 6 to 9 bpm up at 12 mg. If you're already lean and healthy, two things stack against you: your cardiovascular system reads that glucagon signal harder, and you don't have a big pile of weight loss to bring the rate back down the way an obese trial participant does. On top of that, lean users sit completely outside the trial population, so the dosing logic there comes from receptor pharmacology and single dose studies, not chronic trials in lean people. If that's you and you're climbing, track your resting heart rate every week, especially past 4 mg.

Couple more honest ones. This is still investigational. The Phase 3 program runs into 2026 and 2027 and there's no FDA approval yet, so every vial out there is sold for research use. Muscle matters too: around a quarter of the weight you lose on this class isn't fat, it's lean tissue including muscle, so slow titration, real protein, and lifting are what keep that from getting eaten. And stopping hits harder than sema or tirz. Appetite comes back over about a month and the metabolic rate defense fades within weeks, so don't just yank it, step down over a couple months. If you're coming off tirzepatide, do not carry your dose across, you've got tolerance to the GIP and GLP-1 side but none to glucagon, so restart around 1 to 2 mg.

if you're running reta, where'd you settle, and did you stop at 8 or push to 12. curious how the heart rate treated people at the top

Full doses, the lean ladder, and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

BPC-157 is the peptide most people try first, usually because a joint or a tendon won't cooperate and they heard this fixes everything. It does real things through real mechanisms. But there's a gap between how it gets talked about and what the human data supports, and the way you use it matters more than most people realize, so here's the straight version.

It works on two bottlenecks that stall an injury. First, blood flow. It drives new capillary growth through the VEGF pathway to get circulation back into tissue that isn't getting enough, which is why people report an injured area feeling warmer in the first week. Second, inflammation, but it turns it down instead of shutting it off. That's the part that separates it from NSAIDs and steroids. Those kill inflammation but also wreck collagen quality, because the same signals that hurt are the ones driving repair. BPC-157 quiets the noise while letting the rebuild keep going.

Now the honest part. The preclinical case is genuinely the broadest of any healing peptide. A 2025 review screened 544 studies across gut, tendon, muscle, blood vessels, and nerve tissue. That's a lot of smoke. The catch is almost all of it is animal work. Human clinical trials are still thin. So it's not snake oil, but it's also not the sure thing in people that some vendors imply. Somewhere in between, leaning promising.

The thing people get wrong most is the route. For a muscle or tendon injury you want it subcutaneous and close to the injury, within a couple centimeters if you can reach it, because you get a higher local concentration before it dilutes into the whole body. Injecting your belly for a bad knee still does something, but it's the weaker version. The exception is gut stuff. For IBD, leaky gut, that kind of thing, oral is the move, because BPC-157 is weirdly stable in stomach acid and survives long enough to hit the intestinal lining directly. So SC near the injury for joints and tendons, oral for the gut. Don't mix those up.

Use	Dose	Route	Length
Acute injury	500 to 750 mcg daily	SC near the injury	4 to 8 weeks
Gut (IBD, leaky gut)	500 mcg twice daily	Oral	4 to 6 weeks
Chronic or tendon	500 mcg daily	SC near the injury	8 to 12 weeks
Maintenance	250 to 500 mcg	SC, 2 to 3x a week	as needed

3 mL of bac water in the 10 mg vial puts you at 3.33 mg/mL, so 500 mcg is 15 units. Pain and swelling usually drop in the first week or two, full effect builds over 4 to 8 weeks. Run it in defined blocks, not forever. No tolerance builds, but the protocols are meant to close out.

What it won't do is replace the work. It speeds up repair that's already happening, it doesn't rebuild something you're still actively wrecking. Go right back to loading the injury with no rehab and you're fighting your own peptide.

Safety wise it's mild, occasional injection site irritation, some GI upset on the oral, nothing systemic in the published reports. The one real hard stop is active cancer, because the same mechanism that grows blood vessels to heal tissue is not something you want feeding a tumor. Skip it if that's in the picture, and be cautious right around surgery, since too much new vessel growth can mess with wound timing. It's also FDA Category 2 since 2023 and WADA banned, so anyone getting tested for sport should stay away entirely.

One more, since it comes up constantly. After the 2023 ruling, PDA (pentadeca arginate) showed up as the "legal" version. Same exact peptide sequence, just the arginate salt, and it does have better gastric stability on paper. But the 90% oral absorption number that gets thrown around has no study behind it, and there's zero peer-reviewed research on PDA specifically. Same molecule, better stability story, and a lot of marketing running ahead of the data. Not a scam, just don't pay a premium expecting proof that isn't there.

anyway that's the real rundown. if you've run it, did you inject near the injury or just belly it. curious whether people notice the difference

Full doses and bloodwork are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

These two get lumped together constantly as "the Russian nootropic peptides," and people treat them like two flavors of the same thing. They're not. One is a focus tool and one is an anxiety tool, and the reason they always come up in the same breath is that the standard move is to run them together, not pick between them.

Semax first. It's a synthetic analog of an ACTH fragment with a little stabilizer tail, registered as a real pharmaceutical in Russia since 1994 and used over there for stroke recovery and getting your head back after illness or heavy mental work. What it does is push BDNF, the growth factor your brain uses to build and repair connections. So it's not a stimulant. It doesn't spike dopamine and hand you a caffeine jolt. It shifts your brain toward growth mode over a few days, and what people report is clarity, the mental static dropping, easier task initiation, less procrastination. There's even a 110 patient stroke study showing it raised BDNF in actual humans, which is more than most things in this space can claim.

Two things about Semax you have to respect. It's morning only, because it's mildly activating and dosing it late will wreck your sleep. And cycling isn't optional, 10 to 14 days on then a few days off, because the receptors desensitize and the same dose quietly stops working if you never break. The other thing people hit is grumpiness at higher doses. That irritability on the comedown is your cue to drop the dose, and it's also the exact reason Selank shows up next to it in the stack.

Selank is the calm side. It's an anxiolytic, but not the benzo kind. Instead of forcing GABA channels open like Xanax does, which gets you calm but also foggy, slow, and dependent, Selank props up the genes and receptors that hold your inhibitory tone on their own. So you get a lower anxiety floor without a lower cognitive ceiling. Russian trials ran it head to head against phenazepam, a serious benzo, and it matched the anxiety relief with none of the sedation or dependence. Registered pharmaceutical over there since 2009.

The one thing Selank is not is a panic button. The onset is too slow to stop a panic attack already in progress, that's still benzo territory. Selank is the daily floor raiser that makes panic less likely to start in the first place. And unlike Semax, the timing is flexible, it won't fog your day or ruin your night, so you can run it whenever.

Side by side:

	Semax	Selank
For	Focus, clarity, BDNF	Anxiety, calm, no sedation
How	Pushes BDNF and TrkB	Props up your own GABA tone
Feel	Mildly activating	Calm, no drowsiness
Dose	200 to 600 mcg, morning only	250 to 500 mcg, 1 to 3x daily
Recon	3 mL in the 10 mg vial	2 mL in the 5 mg vial
Timing	AM only	Flexible, AM or PM
Cycling	10 to 14 on, 2 to 3 off	Courses of 2 to 4 weeks, breaks for sensitivity

Why they pair so well is simple once you see the two profiles. Semax pushes you forward and can leave you a little wired or short tempered. Selank takes that edge off without dulling the focus Semax is handing you. Run together you get the clarity and drive with the anxiety smoothed underneath it. Focus without the jitter, basically.

Couple things they share. Neither hits like a stimulant, both build over 3 to 5 days as gene expression shifts, so if you're waiting on a caffeine style kick you'll write them off as duds. Both want cycling for receptor sensitivity, not because they're dangerous, there's no dependence with either. Both lean on a solid Russian clinical record but zero Western RCTs, since neither is patentable enough for anyone here to fund the studies. And both come in N-acetyl versions that last longer per dose if you'd rather not inject as often, same molecule, just harder to break down.

if you run these, are you stacking them or riding one solo. curious how the combo versus single shakes out in here

Full doses and bloodwork for both are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

Since I brought it up in the melanotan post, figured PT-141 earned its own writeup, because it might be the most misunderstood one in this whole category.

Quick background. PT-141 (bremelanotide) is basically the cleaned up child of melanotan 2. Somebody noticed MT-2 was throwing erections as a side effect, isolated that part, and turned it into a real drug. It got FDA approved in 2019 as Vyleesi for low sexual desire in women. So unlike most of what we run, this one has an actual approval and real trials sitting behind it.

Here's the part that trips people up. It's not viagra. Viagra and the rest of the PDE5 stuff work on blood flow, they're plumbing. PT-141 works up in your brain instead. It hits MC4R and bumps dopamine in the reward and arousal regions, so what it moves is desire, the wanting, not just the mechanics. That's why it works on women too, and why a guy with no physical problem who just feels flat still gets something out of it. If the issue is blood flow, this isn't your tool. If the issue is that the drive isn't there, this is the one built for it.

Dosing, the community injectable version runs titrated up slow:

Weeks	Daily dose	Units
1 to 8	500 mcg	15 units
9 to 12	1,000 mcg	30 units
13 to 16	1,500 mcg	45 units

That's 3 mL of bac water in a 10 mg vial, which puts you around 3.33 mg/mL. Subcutaneous, abdomen or thigh, once a day. The FDA version is an on demand shot, 1.75 mg before sex up to 8 times a month, so the slow daily titration above is the more conservative research approach. Sub q gets you near 100% absorption and is a lot easier on you than the nasal sprays, which are all over the place on dosing.

Side effects are mostly nausea, and it's common, around 40% feel it, but it fades with use. Flushing and headache turn up too. Two worth respecting: it can raise your blood pressure temporarily, so if you've got uncontrolled hypertension or heart issues, sit this one out. And with repeated use you can pick up some skin darkening from the MC1R crossover, same family trait as melanotan, though it usually reverses.

One thing people get wrong, do not stack it with melanotan 2 or any other MC4R compound at the same time. They stack on top of each other and you're begging for the blood pressure and nausea to spike. Pick one.

That's PT-141. One of the few in this space with a genuine FDA approval, it treats desire instead of blood flow, and the two things to actually respect are the blood pressure note and not doubling up with melanotan.

if you've run it, did it move the needle on desire or just give you the physical side. curious how that splits in here

Full doses and bloodwork for everything are in the pinned cheat sheet: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

Someone asked me about melanotan 2 last week so I went down the rabbit hole, figured I'd put it here instead of typing it twice.

The thing that gets left out of most explanations is that it doesn't just tan you. It lights up four of the five melanocortin receptors, and a couple of those sit in your brain, so the appetite drop and the surprise erections come along whether you wanted them or not. Same drug, same broad activation, just landing in different places. That's why you can't really get the tan without flirting with the rest of it.

What a lot of people don't realize is there's an approved version of basically this. Melanotan 1 (afamelanotide) is the linear one. It only hits the skin receptor, stays out of your brain, and has more than a decade of clean data behind it. MT-2 is the cyclic one that hits everything and never finished trials. It's Category 2 and illegal to sell for human use in the US, UK and Australia, so treat all of this as research framing.

Community dosing looks like this:

Phase	Dose	How often	When
Day 1 tolerance test	250 mcg	Once	Evening
Loading, fair skin	500 mcg	Daily, 3 to 4 weeks	Evening, before bed
Loading, medium to dark	500 mcg	Daily, 1 to 2 weeks	Evening
Maintenance	500 mcg	Weekly to biweekly	Evening

Put 2 mL in a 10 mg vial and you're at 5 mg/mL, so 500 mcg is 10 units. Evening shots because the nausea peaks 30 to 90 minutes in and you'd rather be asleep for that. And you still need UV, sun or a bed, or the whole thing is pointless. The peptide builds the capacity to tan, UV is what pulls it out.

Here's the part I care about and the reason I bothered writing this. The mole stuff is real. Across the case reports you get moles darkening, new ones showing up, dark bands under the nails. The receptor activation itself isn't the cancer driver, the big cohorts are reassuring there, but the mole changes are documented enough that a full body dermatology check before, during and after is not optional. And if melanoma runs in your family or you've already got a pile of odd moles, this is a hard no, not a proceed with caution.

Source is the other one. It's a gray market compound and the quality problems are genuinely bad. There's testing out there that found tanning kits with over 100 unidentified ingredients in them. You can dose it perfectly and still get wrecked by what's in the vial, so where it comes from matters more than the number on your pin.

And if the reason you were curious was the libido effect, that one got pulled out and turned into PT-141, same effect isolated and approved for exactly that. Use the thing built for the job.

Anyway, that's the rundown. If you've run it, are you keeping up with the derm visits or is that the part everyone quietly drops.

Full doses and bloodwork for everything are in the pinned cheat sheet if you want them: https://www.reddit.com/r/NTNPerformance/comments/1tht5o3/the_only_peptide_cheat_sheet_youll_need_doses/

Tesamorelin and CJC-1295 (No DAC) are both synthetic GHRH analogs. Both act on the pituitary to stimulate your own growth hormone release, and because they sit in the same family, people assume they do the same job. They don't. They're built differently and they suit different research goals. Here's where they split.

The molecule

Tesamorelin is the full 44 amino acid GHRH sequence with a trans-3-hexenoic acid modification on the front end that shields it from DPP-IV, the enzyme that chews up natural GHRH in minutes. CJC-1295 (No DAC) is a shortened 29 amino acid fragment (Mod GRF 1-29) with four amino acid swaps for stability. So one is the whole hormone stabilized, the other is a modified fragment. That structural difference is where everything else comes from.

The evidence gap, and it's a big one

This is the part most side-by-sides skip. Tesamorelin is FDA approved. It went through two Phase III trials totaling 816 patients and showed a 15 to 20% reduction in visceral fat over 26 weeks. It is the strongest evidence base of any GH secretagogue by a wide margin.

CJC-1295 (No DAC) has zero published human trials. Its case rests on animal work and mechanism. That doesn't make it useless, but if someone tells you the two are equivalent, this is the line that ends that.

What each is for

	Tesamorelin	CJC-1295 (No DAC)
Molecule	Full 44 aa GHRH, hexenoic acid modified	29 aa fragment (Mod GRF 1-29), 4 substitutions
Human evidence	FDA approved, 816 patient Phase III	Zero published human trials
Best known for	Visceral fat reduction (15 to 20%)	General GH and IGF-1 support
Typical research dose	1 to 2 mg nightly	100 to 300 mcg, usually with ipamorelin
Half-life	Short, minutes	Short, minutes
Tolerability	Histamine welts build over weeks 4 to 8	Generally mild (flushing, headache)
FDA status	Approved (Egrifta, 2010)	Never approved, regulatory limbo
WADA	Prohibited	Prohibited

Tesamorelin hits visceral fat specifically because visceral fat cells carry more GH receptors and respond harder than subcutaneous fat. That's the whole point of it. CJC-1295 (No DAC) is a general GH and IGF-1 tool, and it's almost always run alongside a GHRP like ipamorelin, which is why it usually shows up as a blend. One is a visceral fat instrument, the other is a GH-optimization instrument.

Don't confuse No DAC with DAC

Quick one, because it trips people up constantly. No DAC is the short-acting version, pulsatile, dosed daily. The DAC version carries a drug affinity complex that stretches its half-life to 6 to 8 days for sustained elevation. Same base name, completely different behavior. If you're comparing to Tesamorelin, you want the No DAC version, since both are short and pulsatile.

The catch nobody markets

Tesamorelin's fat loss reverses when you stop. In the Phase III extension, patients who came off at week 26 regained about a quarter of their visceral fat by week 52. It adjusts the set point while you run it; your body doesn't learn a new baseline. So it's an ongoing intervention, not a reset. Worth knowing before anyone treats it as a one-and-done.

Practical side

Tesamorelin is the bigger commitment. It doses in the mg range, it needs isotonic water, and it comes with histamine welts that build progressively from around week 4 (real, and manageable with a pre-dose antihistamine, but not fun). It also wants an IGF-1 check around week 8. CJC-1295 (No DAC) doses in micrograms and is generally mild. Both go in at night to ride the natural GH pulse, both keep the somatostatin brake intact, and both are WADA prohibited, so no one testing for competition should touch either.

So which one

If the goal is visceral fat with actual human evidence behind it, that's Tesamorelin. If the goal is general GH support and you're already building a stack around a GHRP, that's CJC-1295 (No DAC). They aren't competitors. They're different tools that happen to share a last name.

If you're running one of these, which one and for what. Curious how the split looks in here, tesa for the visceral fat data or CJC for general GH support.