Fat Loss / Anti-Aging
MOTS-c
mitochondrial open reading frame of the 12S rRNA-c
What it is
MOTS-c is a 16-amino-acid peptide encoded inside your mitochondrial DNA (rather than your nuclear DNA). It was discovered in 2015 and is part of a class called "mitochondrial-derived peptides." Its primary role is metabolic regulation — mitochondria use it to talk to the rest of the cell about energy status. MOTS-c levels naturally decline with age.
How it works
MOTS-c activates AMPK (AMP-activated protein kinase), the same energy-sensing pathway activated by exercise, fasting, and metformin. This shifts cellular metabolism toward burning fat for fuel and improving glucose uptake. It's been called "exercise in a syringe" because it mimics many of the metabolic adaptations to endurance training.
Benefits
- Improved metabolic flexibility — better at burning fat AND glucose
- Increased insulin sensitivity
- Nutrient partitioning toward muscle, away from fat
- Increased exercise capacity and endurance
- Reduced visceral fat
- Cellular energy support (mitochondrial health)
- Anti-inflammatory effects
- Longevity / healthspan implications (animal data)
Timeline
- Week 1–2
- Subtle changes; possible improvement in workout recovery.
- Week 4–6
- Better endurance; improved blood glucose stability.
- Week 8–12
- Visible body composition changes; reduced visceral fat.
Dosing & titration
Standard dose5–10 mg subQ, 2–3x per week
Cycle length8–12 weeks on, 4 weeks off
TimingPre-workout if exercising; otherwise AM
When to titrate upIf 5 mg twice weekly produces no change after 4 weeks, increase to 10 mg or add a third weekly dose. Many users do well at the lower end.
Side effects & risks
- Generally well tolerated
- Mild injection site reactions
- Headache (rare)
- Fatigue in first few doses (transient)
- Limited long-term human safety data
Best results when paired with exercise. MOTS-c amplifies what your body already does in response to training — sedentary use produces weaker results.
Typical price
$120–$220/mo10–25 mg vial from a 503A compounding pharmacy.
Studies
- Lee C et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance — Foundational discovery paper. PubMedCell Metabolism, 2015
- Reynolds JC et al. MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline — Showed exercise-mimetic and longevity effects. PubMedNature Communications, 2021
- Search PubMed for MOTS-c — PubMed searchLive PubMed search
Educational reference only. Not medical advice.