SS-31 (Elamipretide)
A peptide that goes directly to your mitochondrial inner membrane — the exact place where cellular energy is made. SS-31 is further along in clinical development than most peptides, with Phase II/III trials for rare mitochondrial diseases.
SS-31 (also called elamipretide or Bendavia) is a synthetic tetrapeptide that concentrates in the inner mitochondrial membrane — specifically binding to cardiolipin, a phospholipid critical for energy production. It stabilises the electron transport chain, reduces oxidative stress at the source, and has actual clinical trial data behind it.
Who's interested: People with mitochondrial dysfunction, those interested in cellular energy optimisation, and longevity enthusiasts following the mitochondrial theory of aging.
Dive deeper into the researchPotential side effects
- Injection site reactions (most common in trials)
- Mild headache reported in some trial participants
- Generally well-tolerated in clinical studies
What does SS-31 do?
Your mitochondria generate energy through a process called oxidative phosphorylation — a chain of protein complexes in the inner mitochondrial membrane that pass electrons to generate ATP (your cellular fuel). This process is incredibly efficient but also produces reactive oxygen species (ROS) as a byproduct.
As you age, this system becomes leakier — producing more ROS and less ATP. SS-31 targets this exact problem. It binds to cardiolipin, a phospholipid found only in the inner mitochondrial membrane, and stabilises the electron transport chain. Less leakage means less oxidative damage and more efficient energy production.
What sets SS-31 apart from most peptides: it has actual clinical trial data. It's been tested in humans for Barth syndrome (a genetic mitochondrial disease), heart failure, and age-related macular degeneration.
Who uses it?
- Mitochondrial disease patients — clinical trials for Barth syndrome and primary mitochondrial myopathy
- Heart failure research — studied for improving cardiac mitochondrial function
- Longevity biohackers — interested in reversing age-related mitochondrial decline
- Athletes — some use it for enhanced cellular energy and recovery
What to know before trying
SS-31 has more clinical data than most experimental peptides — Phase II/III trials with safety and efficacy data. However, it's not approved for general use. Its clinical development is focused on rare mitochondrial diseases, not longevity per se.
- Developed by Stealth BioTherapeutics — a legitimate pharmaceutical company, not a grey-market compound
- Clinical trial doses are high — 40 mg/day in trials; biohacker doses are often lower (5–20 mg)
- Mechanism is well-understood — cardiolipin binding and ETC stabilisation are well-characterised
- Sourcing is challenging — pharmaceutical-grade SS-31 is not widely available; research-grade quality varies
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Get early accessFrequently Asked Questions
What makes SS-31 different from other mitochondrial supplements?
Most mitochondrial supplements (CoQ10, NMN, PQQ) work indirectly — providing cofactors or precursors. SS-31 goes directly to the inner mitochondrial membrane and binds cardiolipin, physically stabilising the electron transport chain where energy is actually made. This targeted mechanism is unique among available compounds.
Has SS-31 been tested in humans?
Yes. SS-31 (elamipretide) has been through Phase II and III clinical trials for Barth syndrome, primary mitochondrial myopathy, heart failure, and age-related macular degeneration. It showed improvements in exercise capacity and cardiac function in some trials, though results have been mixed.
Is SS-31 available in India?
SS-31 is available as a research peptide from some online vendors, though fewer carry it compared to more popular peptides. It is not approved as a drug or supplement in India. Quality varies significantly — pharmaceutical-grade is preferred but difficult to obtain outside of clinical trials.
Can SS-31 reverse aging?
In animal studies, SS-31 reversed some age-related mitochondrial changes — improving cardiac function, skeletal muscle performance, and kidney function in aged mice. Whether this translates to meaningful anti-aging effects in humans is unknown. It addresses one aspect of aging (mitochondrial dysfunction) but aging is multi-factorial.
How it works in your body
- Cardiolipin binding — SS-31 has a high affinity for cardiolipin, a phospholipid unique to the inner mitochondrial membrane that's essential for ETC complex organisation
- ETC stabilisation — by stabilising cardiolipin-dependent interactions between complexes III and IV, it reduces electron leakage and ROS production
- ATP recovery — improved ETC efficiency means more ATP per oxygen molecule consumed
- Membrane permeability — the peptide's alternating aromatic-cationic structure allows it to cross cell membranes and concentrate 5000x in mitochondria
Clinical trial results
- Barth syndrome: Improved 6-minute walk distance and cardiac stroke volume in Phase II (TAZPOWER trial)
- Heart failure: Phase II data showed improved left ventricular volumes but primary endpoints not met in larger trials
- Aged mice: Reversed age-related declines in cardiac function, skeletal muscle, kidney, and vascular elasticity
- Safety: Generally well-tolerated across trials; most common AE was injection site reaction
Side effects & safety
SS-31 has better safety data than most experimental peptides thanks to clinical trials:
- Injection site reactions — the most frequently reported adverse event (redness, pain, itching)
- Headache — reported by some trial participants
- Generally well-tolerated — no serious drug-related adverse events in published trials
- Long-term unknown — trials ran weeks to months; chronic use data is limited
Who should avoid it: People with active cancer, pregnant or breastfeeding women, and those on medications that affect mitochondrial function without consulting a doctor.
Which labs to monitor
- Lactate — elevated lactate suggests mitochondrial dysfunction; should improve
- CoQ10 levels — complementary marker of mitochondrial health
- CK (creatine kinase) — marker of muscle damage and mitochondrial myopathy
- Exercise capacity testing — 6-minute walk test is the functional outcome used in trials
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