I've been trying some of the David Sinclair NMN + resveratrol stuff for a couple of months. I think I can safely state there has been no noticeable effect in my case. There's a guy on the internet been trying it for 6 months with seemingly some positive effects https://www.youtube.com/watch?v=yWx77ARQ9lo And it seems to do stuff in mice.
https://khn.org/news/a-fountain-of-youth-pill-sure-if-youre-...