Search for a MOTS-c dose and you will find confident numbers: milligrams per kilogram, injection schedules, cycle lengths. Trace any of them back and the trail ends in a rodent study, or nowhere at all.
That is the honest state of this compound. The biology is genuinely interesting and the human dosing literature does not exist.
What MOTS-c actually is
MOTS-c is unusual before you get anywhere near dosing. A 2015 paper reported a short open reading frame within the mitochondrial 12S rRNA encoding a 16-amino-acid peptide, establishing that it is written into mitochondrial DNA rather than the nuclear genome.[1]
Most peptides you can buy are fragments or analogues of hormones your body already circulates. This one is encoded by your mitochondria, which is a different kind of thing entirely.
Its mechanism is specific. MOTS-c regulates insulin sensitivity and metabolic homeostasis, acting primarily on skeletal muscle by inhibiting the folate cycle and its tethered de novo purine biosynthesis.[1] A review describes it as translocating under stress conditions, which is the sort of behaviour that makes a molecule worth studying.[2]
It also belongs to a family. Mitochondria-derived peptides are a recently discovered group encoded by short open reading frames within mitochondrial DNA, now being examined across cardiovascular and metabolic disease.[3]
The finding everyone cites
The animal result is real and it is striking. MOTS-c significantly enhanced physical performance in young mice at 2 months, middle-aged mice at 12 months, and old mice at 22 months.[4]
Three age groups, one consistent effect. That is why this compound has a following.
Note what that sentence does not contain: a dose. Not in the abstract, not anywhere this research could retrieve.
Where the numbers come from
Here is the uncomfortable part.
While researching this article, the sourcing pass looked specifically for the milligram-per-kilogram figure administered in the mouse studies. No retrievable abstract states it. The claim was dropped rather than guessed at.
That does not mean the studies used no dose. Of course they did, and it will be in the methods sections behind paywalls or in supplementary files. It means the numbers circulating on forums and vendor sites are not being carried forward from an accessible citation. Somebody read it somewhere, or converted it, or invented it, and it propagated.
Why a mouse dose would not help you anyway
Suppose you had the exact figure. It still would not give you a human dose.
Converting between species is not arithmetic on body weight. Interspecies dose extrapolation requires a formal conversion, and the published practice guides exist precisely because researchers get this wrong when starting new animal or human experiments.[5]
And the output of that conversion is not what people think it is. Appropriate translation determines the maximum recommended starting dose for a first-in-human trial.[6] That is the dose at which you cautiously begin testing in people who have signed consent forms, under supervision, with bloods being drawn. It is a floor for investigation, not a recommendation.
Taking a scaled rodent dose because it converted cleanly is a category error. The number answers a question nobody asked you.
What has actually been measured in people
Human MOTS-c research exists. It just does not involve injecting anyone.
Exercise raises it. Acute endurance exercise stimulates circulating levels of the mitochondrial-derived peptides humanin and MOTS-c in humans.[7] Your own MOTS-c responds to training.
It tracks with metabolic health. Circulating MOTS-c levels are decreased in obese male children compared with controls.[8] An association in a specific group, not a treatment result.
So the human literature tells you MOTS-c is a real biomarker that moves with exercise and metabolic status. It does not tell you what happens when you inject synthetic MOTS-c, because nobody has published that.
What this article could not establish
Two claims were investigated and removed for want of a source:
The mouse dose, discussed above.
That circulating MOTS-c declines with age in humans. Widely stated, and plausible given the aging research, but no retrievable source in this search says it.
The second one matters, because “levels fall with age, so replace them” is the entire logic of the anti-aging pitch for this compound. That premise is not established here.
The practical read
If you want more MOTS-c and you want it evidenced, exercise. That is the one intervention with human data showing the peptide actually rises.
If you are considering injecting it, understand what you are buying: a compound with genuinely interesting mitochondrial biology, a striking mouse performance result across three age groups, no published human dosing protocol, no human safety data this research could locate, and a dosing figure whose origin nobody can point to.
That is not an argument that it does not work. It is an argument that nobody currently knows, including whoever sold you the vial and printed a number on it.
This article is for research and informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. The peptides discussed here are sold for research use only and are not for human consumption. Nothing in this article constitutes medical advice. Consult a qualified clinician before making changes to a health, training, or supplementation protocol.
References
The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance.. Cell metabolism, 2015.
MOTS-c, the Most Recent Mitochondrial Derived Peptide in Human Aging and Age-Related Diseases.. International journal of molecular sciences, 2022.
Mitochondrial-derived peptides in cardiovascular disease: Novel insights and therapeutic opportunities.. Journal of advanced research, 2024.
MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis.. Nature communications, 2021.
A simple practice guide for dose conversion between animals and human.. Journal of basic and clinical pharmacy, 2016.
Dose translation between laboratory animals and human in preclinical and clinical phases of drug development.. Drug development research, 2018.
Acute endurance exercise stimulates circulating levels of mitochondrial-derived peptides in humans.. Journal of applied physiology (Bethesda, Md. : 1985), 2021.
Circulating MOTS-c levels are decreased in obese male children and adolescents and associated with insulin resistance.. Pediatric diabetes, 2018.
