SS-31 (Elamipretide): What the Research Actually Shows

SS-31, also called elamipretide or MTP-131, is a lab-made peptide built to reach the inside of mitochondria, the tiny power plants that run your cells. It has real human clinical-trial data behind it, which is rare in this category, so this page walks through what researchers actually studied.

A quick note on framing. The trials use the name elamipretide, and most of them ran in people with rare mitochondrial or heart conditions, not in healthy adults. We cite that literature below as research. None of it is a suggestion to use anything.

What researchers have studied

Early dose trial in mitochondrial myopathy (Neurology, 2018). A phase 1/2 randomized, placebo-controlled trial in 36 adults with a genetically confirmed mitochondrial myopathy. Researchers gave the compound by IV at rising doses and measured walking distance on a 6-minute walk test after 5 days. The highest-dose group walked about 64.5 meters farther, compared with about 20.4 meters in the placebo group. PMID 29500292. https://pubmed.ncbi.nlm.nih.gov/29500292/

MMPOWER-3, the large follow-up trial (Neurology, 2023). A phase 3 randomized, double-blind, placebo-controlled trial in 218 people with primary mitochondrial myopathy. They took 40 mg a day by injection or placebo for 24 weeks. This trial did not meet its two main goals (walking distance and a fatigue score). A later subgroup look found a walking-distance signal only in people with one specific genetic variant type. PMID 37268435. https://pubmed.ncbi.nlm.nih.gov/37268435/

TAZPOWER long-term extension in Barth syndrome (Genetics in Medicine, 2024). Barth syndrome is a rare genetic disorder that affects the heart and energy metabolism. In this open-label extension, a small group (10 entered, 8 reached the end) took 40 mg a day by injection for 168 weeks. Researchers recorded improvements in walking distance, fatigue scores, and some heart-function measures over that stretch. Injection-site reactions were the most common side effect logged. PMID 38602181. https://pubmed.ncbi.nlm.nih.gov/38602181/

PROGRESS-HF, a heart-failure trial (Journal of Cardiac Failure, 2020). A phase 2 randomized, placebo-controlled trial in 71 people with heart failure and reduced pumping strength. They took placebo, 4 mg, or 40 mg a day by injection for 28 days. Researchers measured heart volume on MRI and found no meaningful difference versus placebo at 4 weeks. The trial reported it was well tolerated in that group. PMID 32068002. https://pubmed.ncbi.nlm.nih.gov/32068002/

How it works

Mitochondria make most of the energy your cells run on. Inside each one sits a fatty molecule called cardiolipin, which helps hold the energy-making machinery in the right shape.

SS-31 is built to bind to cardiolipin on the inner mitochondrial membrane. In the models studied, that binding helped keep the energy machinery stable, which researchers tied to steadier energy output and less oxidative stress (the cell-level wear that comes from leftover reactive molecules). Because it works down inside the mitochondria, researchers class it as a mitochondria-targeting peptide, not a hormone or a stimulant.

What the research does not establish

Read this part twice. The honest limits matter more than the headlines.

• Nearly all the human trials ran in people with rare mitochondrial or heart disease. Researchers have not established these results in healthy adults, athletes, or the general public.
• The record is mixed, not a clean win. The two larger trials (MMPOWER-3 and PROGRESS-HF) did not hit their main goals. The positive readouts came from a short 5-day trial and a very small long-term group.
• The studies tracked specific markers over weeks to a few years. They were not built to show broad “longevity” or anti-aging outcomes in people.
• Side effects like injection-site reactions were logged within these groups. That record is not a statement about safety for any one person, and nothing here is a claim that the compound is safe to use.
• This page is a research summary only. It does not say the compound does anything “for you.”

For Research Use Only. Not for human consumption. Etched Research supplies compounds for laboratory and research use only. Independent identity and purity testing by Janoshik. Nothing on this page is medical advice, a health claim, or a recommendation to use.