The exercise-mimetic hypothesis

Exercise raises it, and giving it copies some of exercise, in mice

This is the unit where the hype lives, so it is the unit that needs the most discipline. The real finding, from a 2021 Nature Communications paper, is genuinely striking: MOTS-c is exercise-induced, it rises with physical activity, and chronic treatment improved physical performance in old mice. From that grew the "exercise in a molecule" headline.

But a mouse running farther after weeks of injections is not the same as a peptide replacing exercise in a healthy person. This unit separates what was actually measured from what gets claimed, and lands on a careful phrasing: an exercise-responsive mitochondrial peptide with mimetic features in preclinical models. Promising, and unproven in humans.