reta-stacker said:
One more factor worth keeping in mind, and perhaps you're already aware of it: it seems that peptides involved in mitochondrial repair and genesis tend to work better in older individuals, whose mitochondria have declined with age and no longer perform the way they did earlier in life. For younger people, there might be no benefit whatsoever, given that their mitochondria are probably already operating at full capacity. There could be additional situations (beyond aging) in which mitochondria stand to gain from the boost these peptides offer, though my grasp of the science isn't strong enough to say. On top of that, even among older users, the effects might not be especially obvious, because all of the repair happens beneath the surface.