The structure
"SS" comes from Szeto-Schiller, the researchers who designed this family of peptides. SS-31 is four amino acids long and includes two unusual building blocks: a D-arginine (the mirror-image form of arginine) and Dmt, a modified tyrosine.
Those unusual parts make it harder for the body's enzymes to break down than a peptide made only of natural amino acids.
A research chemical and a licensed medicine
Under the name elamipretide, it was developed by Stealth BioTherapeutics. On 19 September 2025 the FDA granted it accelerated approval, as Forzinity, for Barth syndrome, a rare genetic condition. It is the first approved treatment for that condition, and the approval requires a further confirmatory trial.
That approval covers the licensed, prescription product made to pharmaceutical standards. Material sold online as "SS-31" for research is not that product and is not approved for any use. It is not approved in the UK or EU.
Educational information only. Nothing here is medical advice, dosing guidance or a recommendation to use any substance. Research peptides are not approved medicines and are not for human or animal consumption. Speak to a qualified professional and follow the law where you are.
