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MOTS-c vs SS-31 (Elamipretide)

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The key difference

Both target mitochondria in different ways. MOTS-c is a peptide encoded in mitochondrial DNA that acts as a metabolic signal, activating AMPK. SS-31 (elamipretide) is a synthetic peptide that binds cardiolipin in the inner mitochondrial membrane, and it has been tested in human trials for mitochondrial disease.

Side by side

What it is
MOTS-cMOTS-c is a mitochondrial-derived peptide encoded within the 12S rRNA region that acts as a regulator of metabolism. It is studied for improving insulin sensitivity, metabolic flexibility, and exercise capacity.
SS-31 (Elamipretide)SS-31 (elamipretide) is a mitochondria-targeted tetrapeptide studied for protecting mitochondrial function in conditions involving oxidative stress and energy failure. It has been investigated clinically for mitochondrial myopathy and heart and kidney disease.
Research status
MOTS-cResearch chemical
SS-31 (Elamipretide)Preclinical
Category
MOTS-cLongevity & Anti-aging, Weight & Metabolic
SS-31 (Elamipretide)Longevity & Anti-aging, Healing & Recovery
Half-life
MOTS-cShort, estimated in the range of minutes to a few hours
SS-31 (Elamipretide)Approximately 2-3 hours in humans for the parent compound
Routes
MOTS-csubcutaneous
SS-31 (Elamipretide)subcutaneous, intravenous
Reported dosing
MOTS-cFor research use only and not personal medical advice: published and lab protocols commonly reference 5-10 mg per administration with frequency varied across study designs. Not approved for human use.
SS-31 (Elamipretide)Research-use only and not medical advice; clinical trials of elamipretide have used roughly 40 mg subcutaneously once daily, with intravenous protocols in some acute settings. These are research figures, not personal guidance.
Studied for
MOTS-c
  • Activates AMPK to improve metabolic flexibility in study models
  • Enhances insulin sensitivity and glucose uptake
  • Studied for reduced fat accumulation and weight regulation
  • Investigated for increased exercise capacity and endurance
SS-31 (Elamipretide)
  • Stabilizes cardiolipin and improves mitochondrial bioenergetics
  • Reduces mitochondrial reactive oxygen species production
  • Studied for mitochondrial myopathy and exercise capacity
  • Investigated for protection of heart and kidney tissue under stress
Side effects
MOTS-c
  • Injection-site irritation or redness
  • Possible transient fatigue or lightheadedness
  • Potential changes in blood glucose
  • Unknown long-term safety in humans
SS-31 (Elamipretide)
  • Injection-site reactions are commonly reported in trials
  • Headache
  • Gastrointestinal upset
  • Limited long-term human safety data
Cited studies
MOTS-c4 on its page
SS-31 (Elamipretide)4 on its page

How MOTS-c works

MOTS-c is a 16-amino-acid peptide encoded by the mitochondrial 12S rRNA gene that translocates to the nucleus under metabolic stress to regulate adaptive gene expression. It activates the AMPK energy-sensing pathway, enhancing glucose uptake, fatty-acid oxidation, and metabolic flexibility while reducing reliance on the folate-purine-AICAR pathway. By influencing nuclear transcription factors such as NRF2, MOTS-c modulates antioxidant and stress-response programs implicated in aging and insulin resistance. These mechanisms underlie its preclinical effects on weight, glucose homeostasis, and physical performance.

Full MOTS-c profile →

How SS-31 (Elamipretide) works

SS-31 is a cell-permeable aromatic-cationic tetrapeptide (D-Arg-dimethylTyr-Lys-Phe-NH2) that selectively concentrates in the inner mitochondrial membrane, where it binds the phospholipid cardiolipin. By stabilizing cardiolipin and its interaction with cytochrome c and respiratory-chain supercomplexes, SS-31 improves electron-transport efficiency, increases ATP production, and reduces electron leak and reactive oxygen species generation. This preservation of cristae structure and mitochondrial bioenergetics underlies its studied protective effects in tissues with high energy demand such as heart, skeletal muscle, kidney, and retina.

Full SS-31 (Elamipretide) profile →

Dosing shown is what research and community sources report, not a recommendation. For educational and research purposes only; not medical advice. How we source this

PeptideChat is for educational and research purposes only. Nothing on this site constitutes medical advice. Peptides are sold as research chemicals only and are not intended for human use. These statements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. PeptideChat is an independent educational resource — not a pharmacy, compounding, or 503A/503B outsourcing facility — and does not sell products or provide medical advice.