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What it is
MOTS-c is a 16-amino-acid peptide, unusual because it is encoded not in the cell's main nucleus but inside the mitochondrial genome (specifically a short reading frame within the 12S ribosomal RNA gene). It was first described by Lee and colleagues in 2015 as one of a small family of 'mitochondrial-derived peptides' that act as signaling molecules between the mitochondria and the rest of the body.
Researchers often frame MOTS-c as an 'exercise mimetic' because exercise naturally raises its levels and, in animals, giving MOTS-c reproduces some benefits of physical training. Levels of the peptide in blood and muscle appear to decline with age, which has fueled interest in it for metabolism and healthy aging.
Important caveat: nearly all of this understanding comes from cell and mouse experiments. MOTS-c is sold only 'for laboratory research use,' is not a medicine, and its effects in humans are largely unproven.
What people research it for
Better insulin sensitivity and glucose control
Animal studiesIn mice, MOTS-c improved insulin-stimulated glucose uptake and helped prevent high-fat-diet-induced insulin resistance, largely via AMPK in skeletal muscle.
Exercise-mimetic effects on physical capacity
Animal studiesInjected MOTS-c increased running capacity and physical performance in young, middle-aged and old mice, and exercise raises the body's own MOTS-c in people.
Reduced obesity and fat accumulation
Animal studiesMOTS-c reduced diet-induced obesity and hepatic fat in rodents by promoting fat oxidation.
Metabolic/liver markers in a human analog trial
Early human dataCB4211, a modified MOTS-c analog (not native MOTS-c), lowered liver enzymes and glucose in a small Phase 1 obesity/NASH study.
How it works
The best-studied action of MOTS-c is activation of AMPK, a master 'energy sensor' enzyme. When cellular energy runs low, AMPK switches on fat burning and glucose uptake. In mouse studies MOTS-c interferes with the folate–purine biosynthesis pathway, which raises AMPK activity and improves how skeletal muscle takes up and uses glucose—broadly the same metabolic shift that exercise triggers.
A second, more surprising mechanism: under metabolic stress, MOTS-c physically moves from the mitochondria into the cell nucleus, where it helps turn on stress-defense and antioxidant genes. This lets a mitochondria-encoded peptide directly influence which nuclear genes are expressed—a form of communication from the mitochondria back to the cell's control center.
What the research actually shows
The foundational work is Lee et al. (Cell Metabolism, 2015), which identified MOTS-c, showed it activates AMPK, improves insulin sensitivity in skeletal muscle, and protects mice from high-fat-diet obesity and insulin resistance. A 2018 follow-up in the same journal showed the peptide translocates into the nucleus to regulate stress-response genes.
Reynolds et al. (Nature Communications, 2021) established the 'exercise mimetic' story: acute exercise increases MOTS-c in human skeletal muscle and blood, and MOTS-c injections improved physical performance and healthspan even in old mice. Both mouse and human data suggest circulating MOTS-c falls with age.
Human intervention data, however, are minimal. There are no published controlled trials of native MOTS-c in people. The only human dosing evidence comes from CB4211, an engineered MOTS-c analog, which passed a small early-phase safety study—so claims about MOTS-c benefits in humans remain largely extrapolated from animals.
Handling & storage
Storage at a glance
Vendor consensus- Lyophilized
- -20°C long term; 2 to 8°C for short periods
- 24+ months at -20°C is claimed by one vendor; not independently validated
- Keep dry, dark, and sealed.
- Reconstituted
- 2 to 8°C
- Use within 14-28 days
- Vendor range for bacteriostatic-water preparations. Some laboratory protocols instead freeze aliquots.
- Light
- Protect from light.
- Room temperature
- Vendor guidance limits dry-powder room-temperature exposure to roughly 1-4 weeks for shipping only.
- Reconstitution
- bacteriostatic water or study-specific buffer
- Do not repeatedly freeze and thaw the same aliquot.
Basis: Vendor consensus. Sources: PX1 MOTS-c shelf-life ranges, MOTS-c refrigerated guidance, Palmetto MOTS-c aliquot guidance
Vendor guidance calls for dry MOTS-c at -20°C long term, with 2 to 8°C used only for short periods. After mixing, published vendor windows range from 14 to 28 days at 2 to 8°C. Some laboratory protocols instead freeze single-use aliquots.
Keep MOTS-c protected from light and avoid repeated freeze-thaw cycles. It contains oxidation-sensitive residues, so minimize oxygen and warm exposure. The quoted windows are vendor guidance, not a public formulation-specific assay.
Safety & cautions
There is very little human safety data for MOTS-c. Native MOTS-c has no completed published human safety trials; the closest evidence is the CB4211 analog, which was reported as generally well tolerated in a small Phase 1 study. Anecdotal reports mention heart palpitations and increased heart rate, but these are not from controlled trials.
MOTS-c is not approved by the FDA for any use and is sold strictly for laboratory research. It was added to the WADA Prohibited List effective January 1, 2024, so it is banned in competitive sport. Because long-term effects in humans are unknown, it should be treated as an experimental compound.
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Frequently asked questions
Is MOTS-c FDA approved?
No. MOTS-c is not FDA approved for any medical use and is sold only for laboratory research. It is not a medicine or dietary supplement.
Is there human evidence that MOTS-c works?
Very little. Almost all findings are from cell and mouse studies. The only human dosing data come from CB4211, a modified MOTS-c analog, in a small early-phase trial—not from native MOTS-c.
Why is MOTS-c called an 'exercise mimetic'?
Because exercise naturally raises MOTS-c levels, and in animals giving MOTS-c reproduces some exercise-like benefits such as improved metabolism and running capacity. This does not mean it replaces exercise in humans.
Does MOTS-c decline with age?
Studies in both mice and humans suggest circulating MOTS-c tends to fall with age, which is part of why it's studied in the context of metabolism and aging.
Is MOTS-c banned in sports?
Yes. The World Anti-Doping Agency (WADA) added MOTS-c to its Prohibited List effective January 1, 2024, so it is banned for competitive athletes.
Sources
- Lee et al., MOTS-c Promotes Metabolic Homeostasis and Reduces Obesity and Insulin Resistance — Cell Metabolism (2015)
- MOTS-c Translocates to the Nucleus to Regulate Gene Expression in Response to Metabolic Stress — Cell Metabolism (2018)
- Reynolds et al., MOTS-c is an exercise-induced regulator of age-dependent physical decline and muscle homeostasis — Nature Communications (2021)
- MOTS-c research overview — NCBI PMC full text (Reynolds et al., 2021)
Last reviewed July 7, 2026. This guide is educational and research-focused, not medical advice. MOTS-c products referenced on PeptidePub are sold by third parties as materials for laboratory research use only, not for human or animal consumption.
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