MOTS-c is a genuinely interesting piece of biology. Mitochondria carry their own small genome, separate from the DNA in the cell nucleus, and MOTS-c is a short peptide encoded within it. It appears to be involved in how cells manage energy and respond to metabolic stress, and human studies have found that levels rise with exercise, which is a real finding. That finding is also the entire foundation of the marketing, and it does not say what the marketing implies. Observing that a molecule increases naturally when you exercise is a completely different claim from demonstrating that injecting it produces benefits. No trial has ever administered MOTS-c to a human being. The distance between those two statements is the whole story here.