MOTS-c
MOTS-c (mitochondrial open reading frame of the 12S rRNA-c)
What is MOTS-c?
MOTS-c: 16-amino-acid mitochondrial-derived peptide encoded in the mitochondrial 12S rRNA gene that acts as an exercise-mimetic metabolic regulator (AMPK activation, GLUT4). The sources cited here most often discuss it for: Insulin sensitivity, animal; Exercise capacity, animal; Endurance, anecdotal. Evidence label: Preclinical.
- Type
- Peptide
- Family
- Longevity & Mitochondria
- Evidence label
- Preclinical (2 of 5)
- Regulatory status
- Not approved by the US FDA for use in humans or in compounded medications, and an FDA briefing for its compounding advisory committee highlighted the lack of clinical data on efficacy or safety; it is prohibited at all times in sport under WADA's AMPK activator class.
- Goals discussed
- Fat Loss & Metabolism, Energy & Endurance, Muscle & Tone
- Also called
- mitochondrial open reading frame of the 12S rRNA-c, Mitochondrial Open Reading Frame of the 12S rRNA Type-C, MOTs-C, Motsc, Mots, exercise mimetic
- Last reviewed
- 2026-10-11
- 16-amino-acid mitochondrial-derived peptide encoded in the mitochondrial 12S rRNA gene that acts as an exercise-mimetic metabolic regulator (AMPK activation, GLUT4); research compound, not FDA-approved.12
Regulatory status Not approved by the US FDA for use in humans or in compounded medications, and an FDA briefing for its compounding advisory committee highlighted the lack of clinical data on efficacy or safety; it is prohibited at all times in sport under WADA's AMPK activator class. 3
Names as used in gyms, forums and gray-market listings. Reported, not endorsed; stacks have not been studied as combinations.
Here, we report that mitochondrial-encoded MOTS-c can significantly enhance physical performance in young (2 mo.), middle-age (12 mo.), and old (22 mo.) mice.
Abstract of a mouse study; the human part of the paper measured natural MOTS-c levels after exercise, not administered MOTS-c.
What is MOTS-c researched for?
The three outcomes most discussed for MOTS-c in the sources below, as those sources report them. humanpeptides.fyi makes no claims of its own: a listed benefit can be unproven or can have failed in trials, and the label on each line says which.
What do researchers and users say about MOTS-c?
FDA has not identified any human exposure data on drug products containing MOTs-C administered via any route of administration.
FDA safety assessment written during its review of a nomination to use MOTS-c in pharmacy compounding.
MOTS-C is one of those peptides that some people get an immediate response, some people feel nothing, and others experience the fatigue you are talking about.
Forum reply summarizing mixed user experiences; anecdotal, uncontrolled.
What side effects of MOTS-c are reported?
- Injection-site welts/itching, fatigue, crashes, dizziness, occasional histamine-like reactions reportedanecdotal Reddit/forum1011
- No human safety trials of exogenous MOTS-c12
- Faster heart rate or palpitations, insomnia, fever, and local or whole-body immune reactions reported by people buying MOTS-c online.anecdotal, summarized by USADA3
- Risk of immune reactions against the peptide (immunogenicity) and uncertain impurity content in compounded or research-grade products.FDA assessment9
- Possible low blood sugar when combined with insulin, metformin or other glucose-lowering drugs.theoretical, education site13
What do peptide guides say about MOTS-c?
- NCBI PMC The discovery paper describes a 16 amino acid peptide encoded in mitochondrial 12S rRNA that mainly targets skeletal muscle, inhibits the folate cycle to activate AMPK, and prevented diet- and age-related insulin resistance in mice. 14
- NCBI PMC In people, exercise raised natural MOTS-c levels in muscle and blood, while intermittent treatment started late in life improved physical capacity and healthspan in old mice. 5
- Dr. Axe Dr. Axe's peptide library rates MOTS-c as preclinical, studied only in cells and animals for metabolism and insulin sensitivity, research-only, and flagged by FDA for unresolved safety concerns. 15
- PepEdHub PepEdHub describes MOTS-c as the first mitochondria-encoded peptide shown to act like a hormone, signaling from mitochondria to the nucleus to change gene expression, while acknowledging limited human clinical data. 16
- Seek Peptides Seek Peptides warns of possible additive effects with other AMPK activators such as metformin, and a risk of low blood sugar when combined with insulin or other glucose-lowering drugs. 13
What does the research say, system by system?
Body & tissues2
Hormones & physiology2
Cells & mitochondria2
Weight & metabolism2
Muscle2
Also notable1
- Late-life treatment trended toward longer median (6.4%) and max (7%) lifespan in mice, not statistically significantanimal4
How strong is the evidence for MOTS-c?
Mostly animal + cell studies and human observational data on endogenous levels; exogenous use anecdotal
Mostly cell and animal studies. Human effects unknown. How tiers work
Questions about MOTS-c
What is MOTS-c?
16-amino-acid mitochondrial-derived peptide encoded in the mitochondrial 12S rRNA gene that acts as an exercise-mimetic metabolic regulator (AMPK activation, GLUT4).
Is MOTS-c FDA-approved?
Not approved by the US FDA for use in humans or in compounded medications, and an FDA briefing for its compounding advisory committee highlighted the lack of clinical data on efficacy or safety; it is prohibited at all times in sport under WADA's AMPK activator class.
What is MOTS-c researched for?
The sources cited on this page most often discuss three outcomes: Insulin sensitivity, animal; Exercise capacity, animal; Endurance, anecdotal. Each line above shows what the source reports and how strong that evidence is.
What side effects of MOTS-c are reported?
Reported in the cited sources: Injection-site welts/itching, fatigue, crashes, dizziness, occasional histamine-like reactions reported; No human safety trials of exogenous MOTS-c; Faster heart rate or palpitations, insomnia, fever, and local or whole-body immune reactions reported by people buying MOTS-c online. The list is not complete, and few listed risks does not mean a compound is safe.
How strong is the evidence for MOTS-c?
Evidence label: Preclinical. Mostly animal + cell studies and human observational data on endogenous levels; exogenous use anecdotal.
What else is MOTS-c called?
Names used for it include mitochondrial open reading frame of the 12S rRNA-c, Mitochondrial Open Reading Frame of the 12S rRNA Type-C, MOTs-C, Motsc, Mots, exercise mimetic.
Does humanpeptides.fyi recommend MOTS-c?
No. humanpeptides.fyi makes no claims and no recommendations of its own. It summarizes and links to what others have published and posted. Nothing here is medical advice; talk to a licensed clinician.