MOTS-c
Mitochondrial ORF of the 12S rRNA type-c, mitokine
A peptide encoded by mitochondrial DNA rather than the nucleus. Genuinely novel biology, marketed far ahead of the human evidence.
Preclinical only
Not approved. No completed human efficacy trial. Sold exclusively as research-grade material.
What it is
Nearly every protein in your body is encoded by nuclear DNA. MOTS-c is one of a small set encoded by mitochondrial DNA - a 16-amino acid peptide read out of the 12S rRNA gene. It is described as a "mitokine": a signal the mitochondria send to the rest of the cell and the rest of the body about their metabolic state.
That is legitimately interesting biology, and it is the reason MOTS-c attracts attention out of proportion to its evidence.
Mechanism
MOTS-c translocates to the nucleus under metabolic stress and regulates nuclear gene expression - mitochondria talking back to the genome. It activates the AMPK pathway, the same energy-sensing switch that exercise and metformin act on, promoting glucose utilisation and fatty acid oxidation.
What the evidence actually shows
In humans, MOTS-c is an observed biomarker, not a tested therapy.
Exercise raises endogenous MOTS-c: skeletal muscle levels increased roughly 12-fold after exercise in human subjects, with circulating levels rising during and after. Levels decline with age. That is the human dataset - it is observational, and it describes the body's own peptide.
In mice, injected MOTS-c improves physical capacity in young, middle-aged and old animals, and late-life intermittent treatment increased both physical capacity and healthspan. This is the source of every performance claim you will read.
Nobody has run the obvious next study: give MOTS-c to humans and see if anything happens. Until that exists, the honest summary is that MOTS-c is a real signal your body produces when you exercise, and injecting it has not been shown to reproduce the effects of exercising.
Practical notes
- The exercise-mimetic framing is backwards. MOTS-c rises because you exercised. Injecting it does not establish the reverse.
- Cycled dosing is copied from the mouse protocols, where intermittent administration was what produced the healthspan result.
- Of everything on this site, MOTS-c has among the widest gap between the sophistication of the underlying science and the thinness of the human evidence.
Side effects and warning signs
Commonly reported
- Injection-site irritation
- Flushing or warmth after dosing
- Fatigue in some reports
- No human safety dataset exists
Stop and get medical help
- Unexpected systemic reaction - with no human safety study, there is no baseline for what is normal
Sources
From the community
Discussion for this compound concentrates in r/Peptidesource and r/Biohackers.
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