What Is SS-31 (Elamipretide)?
SS-31 is a mitochondria-targeted peptide discussed for energy, endurance, and recovery. Here is how it works, what the evidence covers, and who should be careful.
By Pacific RX editorial team · Published
At a glance
SS-31, known by its drug name elamipretide, is a small peptide that concentrates in the inner membrane of the mitochondria, the parts of each cell that turn food and oxygen into usable energy.
What it is
SS-31, known by its drug name elamipretide, is a small peptide that concentrates in the inner membrane of the mitochondria, the parts of each cell that turn food and oxygen into usable energy.
It binds to cardiolipin, a fat that holds the energy-producing machinery together. The idea is that stabilizing this membrane helps mitochondria work more efficiently and produce less oxidative stress.
What the evidence covers
Elamipretide has been studied in people with rare inherited mitochondrial diseases, heart failure, and age-related decline in muscle function. Results have been mixed: some studies showed improvements in specific measures, others missed their main goals.
In the United States it is FDA-approved only for Barth syndrome, a rare genetic disorder. Using SS-31 for general energy, endurance, or longevity goals is off-label, and the human evidence for those uses is limited.
Side effects and who should be careful
In clinical studies, the most common side effect was an injection-site reaction: redness, itching, or pain where the shot was given. Headache and dizziness were also reported.
SS-31 is cleared mainly by the kidneys, so your clinician will want to know about kidney disease and may ask for recent creatinine or eGFR results. Anyone with Barth syndrome should stay on the approved product with their specialist rather than a compounded version.
Fatigue deserves a real workup
Fatigue has many causes, from thyroid disease and anemia to sleep disorders and depression. Fatigue that comes with unintended weight loss, fevers, night sweats, or worsening weakness should be evaluated before starting any peptide.