u/General-Barnacle-553

Going through a period of pretty significant weight loss right now and trying to be smart about supplementation. Not interested in the take everything approach. Want to understand what actually has decent evidence behind it for the specific things that happen during fast weight loss.

Main concerns:

Hair. I've read about telogen effluvium and how it's triggered by physiological stress from rapid weight loss. Found a 2026 study showing it affects the majority of people losing weight quickly. For this specifically I keep seeing biotin, zinc, and iron come up. Is zinc actually evidence based here or is it one of those things people just repeat? And iron, I've read you need to test first before supplementing, ferritin specifically. Is that accurate?

Muscle. I know protein is the main lever here but what about creatine during a weight loss phase? I've seen conflicting things about whether it's useful when you're in a deficit or whether it's more of a maintenance and building tool.

Collagen. 10g hydrolyzed daily is what I keep seeing. Is there a meaningful difference between types? Marine vs bovine? Does the vitamin C cofactor thing actually matter in practice?

Not looking for a full supplement stack. Just trying to understand what has actual research behind it vs what's just popular. Appreciate anyone who's gone through this and actually tracked what made a difference.

Started looking into this a few weeks ago after noticing some changes I wasn't expecting and honestly the research is more interesting than I thought it would be.

The face thing has a name. There are fat compartments in your cheeks and under your eyes that give your face its structure and they deplete as you lose weight. A 2025 study found up to 9% volume loss in the midface per 22 pounds lost. That number surprised me. You can see 9%.

The hair thing is apparently extremely common too. A 2026 paper found 76% higher odds of hair shedding in GLP-1 users at 12 months. The mechanism isn't the drug directly, it's the physiological stress of losing weight fast. Which makes sense but also raises a question I haven't found a good answer to yet. Is the effect proportional to the rate of loss or the total amount lost? Because that would change how you think about it pretty significantly.

And the lean mass piece from the STEP 1 trial is one I think doesn't get discussed enough. Up to 40% of weight lost can be lean mass without specific intervention. That has real implications for what happens when people eventually come off these medications.

Curious whether anyone has come across research on the skin adaptation side of this. That's the piece I've found least documented. How fast does collagen production actually respond to rapid volume loss and is there a threshold where it just can't keep up?

Not looking to debate whether the medications are worth it. They clearly work. Just find the aesthetic and compositional side of the literature genuinely interesting and don't see it discussed much.

I know how this sounds. I've lost 40 pounds over the last 7 months and logically I know that's a good thing. My health markers improved, I can move better, clothes fit differently.

But I look in the mirror and something is just off. I look more tired than I did before I started. My face looks kind of deflated? Like the weight came off but whatever was giving my face its shape came with it.

I've been trying to figure out if this is just my brain not catching up to the physical change or if something is actually happening. Started reading about something called midface volume loss. Apparently when you lose weight fast the fat compartments in your face deflate before your skin can adapt. Found a study that said up to 9% volume loss per 22 pounds lost which honestly kind of shocked me.

Is this a thing other people have experienced? Did it get better as you hit maintenance? I'm still losing so maybe it'll settle but I genuinely wasn't prepared for this part.

I'm at month 3.5 on Wegovy, down 27 pounds, and the past few weeks the hair in the shower has been noticeably more than usual.

Not alarming amounts but enough that I googled it at 11pm and ended up reading research papers until 1am which is probably not the healthiest response.

What I found was actually reassuring in a weird way. it has a name (telogen effluvium), it's extremely common (one study found 76% of GLP-1 users develop it), and it's caused by the rapid weight loss rather than the medication itself. Basically your follicles respond to the physiological stress by entering a resting phase, and then they shed simultaneously a few months later. Mine are apparently right on schedule.

The part that stressed me out a bit: apparently there's a window where intervention changes how bad it gets and how fast you recover. I'm not totally sure I knew I was in that window.

For people who went through this: did it get worse before it got better? How long did the shedding phase last for you? And did anything actually help?

I'm at month 3.5 on Wegovy, down 27 pounds, and the past few weeks the hair in the shower has been noticeably more than usual.

Not alarming amounts but enough that I googled it at 11pm and ended up reading research papers until 1am which is probably not the healthiest response.

What I found was actually reassuring in a weird way. it has a name (telogen effluvium), it's extremely common (one study found 76% of GLP-1 users develop it), and it's caused by the rapid weight loss rather than the medication itself. Basically your follicles respond to the physiological stress by entering a resting phase, and then they shed simultaneously a few months later. Mine are apparently right on schedule.

The part that stressed me out a bit: apparently there's a window where intervention changes how bad it gets and how fast you recover. I'm not totally sure I knew I was in that window.

For people who went through this: did it get worse before it got better? How long did the shedding phase last for you? And did anything actually help?

So I'm down 41 pounds which is genuinely life changing. I feel better than I have in years and I don't regret starting for a second.

But there's a list of things that have happened to my body that my prescriber never once mentioned and that I only figured out by falling down a research rabbit hole at 1am.

The face thing hit me hardest. Around month 3 I started looking more tired in photos. Not thinner but older somehow. Hollow under my eyes in a way I'd never had before. I figured it was just part of losing weight and tried to push through it.

Turns out it has a clinical name. Midface volume loss. There are fat compartments in your cheeks that give your face its structure and when you lose weight fast, they deflate before your skin can adapt. Research published last year found up to 9% volume loss in the midface per 22 pounds lost. That's not subtle. You can see 9%.

The hair thing hit month 4. Shower drain, pillow, brush, way more than normal. Again, nobody told me this was coming. It's called telogen effluvium. 76% of GLP-1 users develop it. Peaks around month 3-4. The frustrating part is there's apparently a window where intervention actually changes the outcome and I had no idea I was in it until I was already past it.

And the muscle thing I'm still processing. The STEP 1 trial in NEJM found up to 40% of weight lost on semaglutide can be lean mass without specific intervention. I've lost 41 pounds. If even a fraction of that was muscle rather than fat that explains a lot about why I feel weaker than I expected to.

Anyway. Has anyone else had any of these? Especially curious about the face changes, whether it improved for anyone and what actually helped.