SS-31 peptide (elamipretide) is a mitochondria-targeted research compound studied for heart failure and mitochondrial disease. Learn about benefits and safety.
SS-31 peptide, also known as elamipretide, is a synthetic four-amino-acid molecule designed to concentrate inside mitochondria and support cellular energy production. Researchers study it mainly for heart failure, rare mitochondrial diseases, and age-related conditions linked to mitochondrial dysfunction. SS-31 is not FDA-approved for general human use, and it is sold to laboratories as a research chemical only.
What Is the SS-31 Peptide?
SS-31 belongs to the Szeto-Schiller family of cell-penetrating peptides. Its structure is a short tetrapeptide — D-Arg-dimethylTyr-Lys-Phe-NH2 — with an alternating aromatic-cationic pattern that helps it cross cell membranes.
The compound has also been studied under code names such as MTP-131 and Bendavia. Unlike many peptides that work by binding to receptors, SS-31 targets a lipid called cardiolipin on the inner mitochondrial membrane.
That unusual mechanism is the reason SS-31 has attracted more academic attention than most research peptides.
How SS-31 Peptide Works in the Mitochondria
- Binds cardiolipin on the inner mitochondrial membrane.
- Stabilizes cristae, the folded membrane structures where energy production takes place.
- Supports electron transport chain efficiency and ATP synthesis.
- Reduces reactive oxygen species generated during oxidative stress.
Because mitochondria power nearly every cell, researchers argue that improving mitochondrial efficiency could matter most in tissues with high energy demands — heart muscle, skeletal muscle, kidneys, and the retina.
SS-31 Peptide Benefits Explored in Research
Most reported ss-31 peptide benefits come from laboratory work and clinical trials, not from consumer use.
- Heart failure: Early studies examined left ventricular function and exercise tolerance.
- Barth syndrome: A rare X-linked mitochondrial disorder; a phase 2/3 trial did not meet its primary endpoint.
- Primary mitochondrial myopathy: The MMPOWER-3 phase 3 trial missed its primary endpoint, though some secondary signals were reported.
- Dry age-related macular degeneration: The ReCLAIM studies evaluated retinal function.
- Kidney injury: Preclinical models of ischemia-reperfusion injury.
Results have been mixed. Some studies show improvements in mitochondrial markers, while larger phase 3 trials failed to reach statistical significance for their main goals. That mixed record is worth remembering when reading any online review that promises dramatic results.
SS-31 Peptide Dosage Used in Studies
There is no established ss-31 peptide dosage for humans outside of clinical trials. Dosing has varied widely by condition and study design.
| Study Area | Reported Dose | Route |
|---|---|---|
| Heart failure | 0.05–0.25 mg/kg/day | Intravenous infusion |
| Barth syndrome | ~40 mg/day | Subcutaneous injection |
| Primary mitochondrial myopathy | 40 mg/day | Subcutaneous injection |
| Ophthalmology research | Topical eye drop formulations | Topical |
These figures are for research reference only and are not a recommendation for self-use. Anyone considering a research peptide should speak with a licensed healthcare professional first.
SS-31 Peptide Side Effects and Safety
In published trials, ss-31 peptide side effects were generally mild and short-lived. Commonly reported issues included:
- Injection site reactions such as redness, pain, or swelling
- Headache
- Nausea
- Fatigue or dizziness
Serious adverse events were uncommon in the trial populations studied. The long-term safety of chronic SS-31 use in healthy adults is unknown, and no large trial has tested the peptide for performance or longevity purposes in healthy people.
SS-31 is not FDA-approved for any human condition, so any use outside a clinical trial is unregulated and unmonitored.
SS-31 Peptide and Bodybuilding
Much of the ss-31 peptide bodybuilding discussion focuses on mitochondrial efficiency rather than muscle growth directly. The theory is that better mitochondrial function could support endurance, recovery, and cellular energy during training.
That theory remains unproven. No controlled human trial has shown that SS-31 builds muscle, increases strength, or improves athletic performance. People who use it for training typically stack it with other research compounds, often without evidence that the combination is safe.
SS-31 Peptide Reviews and Buying Online
SS-31 is sold as a research chemical, not as a supplement or prescription drug. That means it is not held to the same purity, labeling, or manufacturing standards as FDA-approved medicines.
- Look for a third-party certificate of analysis with HPLC and mass-spectrometry data.
- Check that stated purity is at least 98%.
- Understand that "research use only" labeling means the product is not intended for human consumption.
Search results for ss-31 peptide buy online return many vendors with widely different quality standards. Buying from an unverified source carries real risks, including contamination, incorrect concentration, and unknown safety.
What Researchers Still Need to Know
Several open questions remain about SS-31:
- Which patients are most likely to benefit from mitochondrial-targeted therapy.
- Whether benefits seen in animal models translate reliably to humans.
- What long-term dosing and safety look like beyond short trials.
- How SS-31 interacts with other compounds.
SS-31 remains one of the most-studied mitochondria-targeted peptides in academic research. SS-31 is not FDA-approved for human use in the United States, and phase 3 results so far have been mixed.
Anyone with a mitochondrial condition should discuss treatment options with a physician rather than self-treating with a research peptide.
Frequently Asked Questions
Is SS-31 peptide FDA-approved?
No. SS-31 (elamipretide) has not been approved by the FDA for any human indication. It is available only as a research chemical or through clinical trials, and it is not a legal prescription drug in the United States.
What does SS-31 peptide do in the body?
SS-31 binds to cardiolipin on the inner mitochondrial membrane, which helps stabilize mitochondrial structure and supports ATP production. Research has focused on heart failure, mitochondrial myopathy, Barth syndrome, and dry macular degeneration, with mixed results across phase 2 and phase 3 trials.
What are the side effects of SS-31 peptide?
In clinical trials, reported side effects were generally mild and included injection site reactions, headache, nausea, fatigue, and dizziness. Long-term safety in healthy adults is unknown because no large trial has studied chronic use in that population.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.