There are whole threads and countless articles online answering these questions. Hate to say it but, Google is your friend, and there's a search bar on the upper right. There's a lot of reading you'll have to do and it will take a long time to absorb. If you want a straight answer right now, there isn't one. There's a mouse study (mouse not human) starting soon for NMN that will run for 2 years. We'll know more about mice after that, but probably not so much about how these precursors help humans. Dumb as hell I know, but I helped fund the study so.
If you want a simple, one sentence recommendation from a random person on this board like me, I would say do this: Buy Tru Niagen NR for 32 bucks on their website, take it on the days you exercise, 4 to 6 hours prior to exercise, preferably 4 times a week, then tell me what happens.
Additional sentences: If you have a sauna at the gym, use that as well. If you have a Polar heart rate monitor strap, put that on and ensure your HR hits 150+ when exercising. Also, download the Elite HRV app and run a morning readiness with the Polar HRM each day starting before you begin taking NR to establish a baseline HRV for a few days. Then start taking the NR on exercise days and tell me what happens to your HRV over that time period. Even better would be to not exercise while establishing a baseline, start exercising while establishing a baseline, then start the NR and see if there's any difference.
Edited by Nate-2004, 05 December 2018 - 09:22 PM.