--- title: "MOTS-c: what sources report" url: https://humanpeptides.fyi/peptides/mots-c site: humanpeptides.fyi last_reviewed: 2026-10-11 --- # MOTS-c > humanpeptides.fyi makes no claims of its own. Every statement below reports what a cited source says, with its link. Not medical advice. 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. ## At a glance - **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 ## 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); research compound, not FDA-approved. Sources: , **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. Source: ## What is MOTS-c researched for? ### 1. Insulin sensitivity, animal - Improves insulin sensitivity and glucose uptake in skeletal muscle and prevented diet-induced obesity and insulin resistance in mice (animal study) Sources: , - Goals: [Fat Loss & Metabolism](https://humanpeptides.fyi/objectives/fat-loss), [Energy & Endurance](https://humanpeptides.fyi/objectives/energy) ### 2. Exercise capacity, animal - Improves exercise capacity/endurance: old mice treated with MOTS-c ran ~2x longer and farther; late-life treatment improved grip strength and gait (animal study) Sources: , - Goals: [Energy & Endurance](https://humanpeptides.fyi/objectives/energy), [Muscle & Tone](https://humanpeptides.fyi/objectives/muscle) ### 3. Endurance, anecdotal - Users report better cardio endurance, workout duration, recovery and steadier energy when dosed pre-exercise; others notice nothing (anecdotal Reddit) Sources: , , - Goals: [Energy & Endurance](https://humanpeptides.fyi/objectives/energy) ## What do researchers and users say about MOTS-c? > "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." > > Reynolds JC, et al., MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis (Nature Communications, 2021). Context: Abstract of a mouse study; the human part of the paper measured natural MOTS-c levels after exercise, not administered MOTS-c. > "FDA has not identified any human exposure data on drug products containing MOTs-C administered via any route of administration." > > US Food and Drug Administration, Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks. Context: 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." > > Anonymous user, r/Biohacking, MOTS-c, what's your experience with it?. Context: 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 reported (anecdotal Reddit/forum) Sources: , - No human safety trials of exogenous MOTS-c Sources: - Faster heart rate or palpitations, insomnia, fever, and local or whole-body immune reactions reported by people buying MOTS-c online. (anecdotal, summarized by USADA) Sources: - Risk of immune reactions against the peptide (immunogenicity) and uncertain impurity content in compounded or research-grade products. (FDA assessment) Sources: - Possible low blood sugar when combined with insulin, metformin or other glucose-lowering drugs. (theoretical, education site) Sources: ## 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. - **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. - **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. - **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. - **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. ## What does the research say, system by system? ### Body & tissues - Primarily targets skeletal muscle (glucose uptake, muscle homeostasis) and fat tissue (animal) Sources: - Endogenous MOTS-c rises in human skeletal muscle and blood with exercise (human observational) Sources: ### Hormones & physiology - Activates AMPK and increases GLUT4 expression, improving insulin action (animal/cell) Sources: - Circulating MOTS-c relates to lipids and insulin in PCOS and healthy women (human observational) Sources: ### Cells & mitochondria - Mitochondrial-encoded signaling peptide involved in mitohormesis; translocates to nucleus under metabolic stress (review) Sources: - Regulator of age-dependent physical decline in mice Sources: ### Weight & metabolism - Reduced high-fat-diet weight gain and insulin resistance in mice (animal) Sources: - Human weight-loss data lacking; 8-week exercise trial did not change plasma levels in women (human) Sources: ### Muscle - Improved grip strength, physical capacity and muscle homeostasis in aged mice (animal) Sources: - Single dose improved acute exercise performance in mice; long-term activity raises muscle MOTS-c (animal + human) Sources: ### Also notable - Late-life treatment trended toward longer median (6.4%) and max (7%) lifespan in mice, not statistically significant (animal) Sources: ## How strong is the evidence for MOTS-c? **Preclinical** (2 of 5). Mostly animal + cell studies and human observational data on endogenous levels; exogenous use anecdotal _Mostly cell and animal studies. Human effects unknown._ ## Street names and stacks - Street names: [The Exercise Mimetic](https://humanpeptides.fyi/street-names#nick-mimetic) ## 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. --- Family: [Longevity & Mitochondria](https://humanpeptides.fyi/peptides?cat=longevity). HTML version: . Disclaimer: