MOTS-c Peptide: Benefits, Dosage and Evidence
Almost every peptide in research use is derived from a hormone encoded in nuclear DNA. MOTS-c is not. It is encoded inside the mitochondrial genome — the small, separate set of DNA that mitochondria carry from their bacterial ancestry — which makes it part of a genuinely different class of signalling molecules called mitochondrial-derived peptides.
How MOTS-c works
The name stands for "mitochondrial open reading frame of the 12S rRNA type-c." Its central documented action is activation of AMPK, the enzyme that acts as the cell's energy sensor. When AMPK is activated, the cell shifts toward burning fuel rather than storing it: glucose uptake rises, fatty acid oxidation increases, and anabolic processes are dialled down.
MOTS-c does this by interfering with the folate cycle and purine biosynthesis, which raises AICAR — an endogenous AMPK activator. Under metabolic stress it also translocates to the nucleus and influences gene expression directly, which is unusual for a peptide of this size and is why it is described as a mitochondrial-to-nuclear signalling molecule.
What the research shows
Insulin sensitivity and metabolic health
The foundational 2015 work in Cell Metabolism showed that MOTS-c administration in mice improved insulin sensitivity and prevented diet-induced obesity despite a high-fat diet. Subsequent studies replicated improved glucose handling and reduced fat accumulation, and identified skeletal muscle as a primary site of action.
Exercise capacity and physical function
A 2021 study in Nature Communications reported that MOTS-c treatment improved physical performance in young, middle-aged and old mice, including running capacity. The same body of work found that circulating MOTS-c increases in humans after exercise, suggesting it functions as part of the normal adaptive response to physical activity rather than as an external stimulant.
Ageing
Circulating MOTS-c declines with age in humans, and a mitochondrial DNA variant affecting the MOTS-c sequence has been associated with longevity in a Japanese cohort. This is association, not demonstrated causation — but it is the reason MOTS-c appears in longevity research rather than only in metabolic research.
Dosing references
Rodent studies use 0.5–15 mg/kg, and allometric scaling from mouse to human is unreliable for peptides. There is no established human dose. Protocols in circulation typically reference 5–10 mg weekly, sometimes divided into two or three administrations, occasionally run in 4–8 week blocks. That is community practice, not trial evidence, and it should be read that way.
| Vial | Water | Concentration | 2.5 mg | 5 mg | 10 mg |
|---|---|---|---|---|---|
| 10 mg | 2 ml | 5 mg/ml | 50 units | 100 units | — |
| 10 mg | 2.5 ml | 4 mg/ml | 62.5 units | — | — |
| 40 mg | 4 ml | 10 mg/ml | 25 units | 50 units | 100 units |
Enter your own vial and dose below:
Formula: concentration = peptide (mcg) ÷ water (ml). Volume = dose ÷ concentration. One unit on a U-100 insulin syringe = 0.01 ml. Values are for laboratory reference only.
Safety
Animal studies have not reported significant toxicity at the doses used, and because MOTS-c is an endogenous peptide the theoretical risk profile is more favorable than for a synthetic novel compound. Human safety data does not exist. One consideration that follows from the mechanism: a molecule that activates AMPK and alters glucose handling is not neutral for anyone taking medication that affects blood sugar.
MOTS-c — 10 mg / 40 mg — American Peptides
Available in 10 mg and 40 mg vials. Batch-tested with HPLC and mass spectrometry, COA provided. Research use only.
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Frequently asked questions
What is MOTS-c?
MOTS-c is a 16-amino-acid peptide encoded by mitochondrial DNA rather than nuclear DNA. It belongs to a class called mitochondrial-derived peptides and acts as a signalling molecule between mitochondria and the rest of the cell, primarily influencing metabolism through the AMPK pathway.
What are the researched benefits of MOTS-c?
Animal studies report improved insulin sensitivity, resistance to diet-induced obesity, increased exercise capacity, and improved metabolic markers in aged mice. Human data is limited to observational work showing MOTS-c levels rise with exercise and decline with age.
What MOTS-c dose is used in research?
Rodent studies commonly use 0.5 to 15 mg/kg, which does not translate directly to humans. Protocols circulating among researchers typically reference 5–10 mg per week, often split into smaller injections, but no published human dosing trial establishes this.
Does MOTS-c cause weight loss?
In mice fed a high-fat diet, MOTS-c prevented obesity and improved insulin sensitivity. No human trial has tested it for weight loss, so the honest position is that the metabolic mechanism is documented in animals and the human effect is unproven.
How does MOTS-c differ from other peptides?
Most research peptides are fragments or analogues of hormones that act on cell-surface receptors. MOTS-c is encoded inside the mitochondrion and acts largely inside the cell, on metabolic enzymes and gene expression — a different mechanism class entirely.
Sources
- Lee C et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metabolism, 2015;21(3):443–54. PubMed
- Reynolds JC et al. MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. Nature Communications, 2021;12(1):470. PubMed
- Fuku N et al. The mitochondrial-derived peptide MOTS-c: a player in exceptional longevity? Aging Cell, 2015;14(6):921–3. PubMed
- Kim KH, Son JM, Benayoun BA, Lee C. The Mitochondrial-Encoded Peptide MOTS-c Translocates to the Nucleus to Regulate Nuclear Gene Expression in Response to Metabolic Stress. Cell Metabolism, 2018;28(3):516–524. PubMed