The reality is that boosting endurance with any sort of intervention -except of course specific exercise regimens- is extremely hard. If only you guys saw how little benefit such famous doping substances as EPO or cortisol provide, you'd be shocked (strength output BTW is a little different and can be elevated relatively more easily in the short term -albeit the results will likely not be long-lasting).
A healthy criticism is good and since the post by sub7 is addressed specifically to Turnbuckle I will limit my post to the quoted sentence. When I first tried NMN without any other changes to my regular activities, absolutely no exercise regimens for me, I saw a significant difference in boosting endurance and many other factors. This boost stayed permanent so far for a couple of years already. This was replicated with my older relatives too.
Edited by mike20g, 26 February 2021 - 03:21 PM.