My verdict on NMN (personal experience)
I find that my sleep gets real shallow on this stuff. I actually had an attack off the shingles while on it. When I got off it, my energy levels crashed hard, like sleeping trough the entire weekend hard.
I mean I gave it another shot this time very brief and straight away I notuced those shallow sleeps, initial headaches and the nerves that flared up during my shingle episode started getting sore again(nerve pain is something else). Verdict this stuff has no long term safety data 6 months at most is what I heard, no 5, 10, 20 year data.
I mean if it disturbs sleep, I mean you do sleep less for sure and that makes you more "productive". But sleep is very important for immune function from what I heard and shingles rises when immune system gets compromised. Considering what else the immune system does I would watch this stuff with caution.
I mean yeah sure it would be nice to be in your 20s energy wise again. But we are one complex biological biochemical machine and to say we can fix that with a couple of unprooven compounds(at least NMN) is a bit of a pipe dream. I think we need to wait for the medical community to work out proper anti aging treatmants that are scientifically and clinically prooven.