What it is
SS-31 is a small synthetic tetrapeptide that concentrates in the inner mitochondrial membrane. In clinical development it is known as elamipretide (also MTP-131/Bendavia). Unlike many research peptides, SS-31/elamipretide has been the subject of registered human clinical trials, though it has not received general regulatory approval as a marketed drug.
What researchers are studying
- Binding to cardiolipin, a lipid of the inner mitochondrial membrane, studied for its effect on mitochondrial structure.
- Investigated support of electron-transport-chain efficiency and cellular energy (ATP) production.
- Reduction of mitochondrial reactive-oxygen-species in preclinical models.
Areas studied
- Primary mitochondrial diseases (human clinical trials)
- Heart failure and cardiac function (clinical investigation)
- Age-related eye conditions such as dry AMD (clinical investigation)
Evidence summary
Human research
As elamipretide, SS-31 has been evaluated in human clinical trials (including later-phase studies) for conditions such as primary mitochondrial myopathy and certain cardiac and ophthalmic indications. Trial results have been mixed, and it is not an approved therapy; it remains investigational.
Preclinical & animal research
Extensive preclinical work has examined SS-31's cardiolipin binding and its effects on mitochondrial bioenergetics, oxidative stress, and organ protection in animal models of ischemia, heart failure, and aging.
Limitations & uncertainties
- Despite clinical trials, efficacy results have been mixed and it is not approved.
- Findings vary by indication; positive preclinical data has not always translated to trial success.
- Research-market SS-31 is not the regulated clinical formulation.
Safety & research considerations
Elamipretide has been administered in monitored clinical trial settings, but it is not an approved medicine and should not be considered established therapy. Safety data outside controlled trials is limited. This page does not provide dosing guidance.
Frequently asked questions
- Is SS-31 the same as elamipretide?
- Yes. SS-31 is the research designation for the mitochondria-targeting peptide developed clinically as elamipretide (also called MTP-131 or Bendavia).
- Has SS-31 been tested in humans?
- Yes — as elamipretide it has been studied in registered human clinical trials for mitochondrial and cardiac/ophthalmic conditions. Results have been mixed and it is not approved for general use.
References & further reading
Curated literature searches on PubMed and clinical-trial registries. A formal, per-study citation list is being expanded during ongoing editorial review.