Discover what SS-31 peptide is used for in research: mitochondrial function, heart health, and more. Learn how elamipretide works and what clinical trials show.
SS-31 peptide, also called elamipretide, is a synthetic tetrapeptide used in research to target mitochondrial dysfunction. It works by binding to cardiolipin on the inner mitochondrial membrane, which helps stabilize the electron transport chain and reduce oxidative stress. SS-31 is not FDA-approved for human use, and it is legally sold only as a research chemical for laboratory studies.
What Is SS-31 Peptide and How Does It Work?
SS-31 is a four-amino-acid peptide with the sequence D-Arg-dimethylTyr-Lys-Phe-NH2. Its unique structure allows it to penetrate cell membranes and concentrate in mitochondria, where it interacts with cardiolipin.
Cardiolipin is a phospholipid found almost exclusively in the inner mitochondrial membrane. When cardiolipin becomes oxidized, mitochondrial function declines. SS-31 binding protects cardiolipin from oxidation and helps maintain the shape of mitochondrial cristae.
The ability to preserve cristae structure and lower oxidative stress makes SS-31 a valuable research tool. Scientists use it to study conditions rooted in mitochondrial impairment, from heart disease to rare genetic disorders.
What Is SS-31 Peptide Used For in Research?
Scientists use SS-31 to investigate a wide range of mitochondrial-related conditions. The table below summarizes the main research areas and what studies have found so far.
| Research Area | What Studies Suggest | Development Status |
|---|---|---|
| Heart failure and cardiac ischemia | May reduce reperfusion injury and improve mitochondrial efficiency | Mixed results in clinical trials |
| Barth syndrome | Improved some functional measures in the TAZPOWER trial | Not approved; under review |
| Primary mitochondrial myopathy | Failed to meet primary endpoint in MMPOWER-3 | Not approved |
| Dry age-related macular degeneration | ReCLAIM trial showed potential visual improvements | Under investigation |
| Neurodegenerative conditions | Preclinical data suggest neuroprotective effects | Early research only |
| Kidney injury | Animal studies show reduced oxidative stress | Preclinical |
Beyond these areas, researchers also study SS-31 for exercise performance, aging, and metabolic disorders. However, no large human trial has proven SS-31 to be an effective treatment for any condition.
Clinical Trial Results for SS-31 (Elamipretide)
Several clinical trials have tested elamipretide in humans, with mixed outcomes. Understanding these results is essential for anyone evaluating what SS-31 peptide is used for.
The EMBRACE-STEMI trial tested elamipretide in patients after a heart attack. It did not meet its primary endpoints for reducing heart damage. A later trial, MMPOWER-3, studied the peptide in primary mitochondrial myopathy. Elamipretide failed to improve the six-minute walk test, the primary endpoint, though some secondary measures showed trends toward benefit.
The TAZPOWER trial for Barth syndrome reported improvements in some functional and cardiac measures. Based on these results, the manufacturer submitted a New Drug Application to the FDA. The FDA has not approved elamipretide for Barth syndrome as of 2025.
The ReCLAIM trial explored elamipretide for dry age-related macular degeneration. It showed potential improvements in visual acuity and retinal structure. Larger trials are needed to confirm these findings.
How SS-31 Compares to Other Research Peptides
SS-31 is just one of many peptides studied for mitochondrial, cognitive, or metabolic effects. Researchers often compare it to other compounds based on their mechanisms and targets.
- SS-31 targets cardiolipin in mitochondria, focusing on cellular energy.
- Semax is a synthetic peptide studied for cognitive enhancement and neuroprotection. If you are curious about what is semax peptide used for, it is primarily researched for stroke recovery and attention.
- PT-141 (bremelanotide) is FDA-approved for hypoactive sexual desire disorder in premenopausal women. Learning what is pt 141 peptide used for reveals a completely different pathway involving melanocortin receptors.
- IGF-1 LR3 is a long-acting insulin-like growth factor analog studied for muscle growth and repair. Understanding what is igf-1 lr3 used for helps clarify its anabolic versus mitochondrial focus.
Many lab protocols also require proper solvents. Knowing what is bacteriostatic water for injection used for is important because it is commonly used to reconstitute lyophilized peptides for research.
If you search for ss 31 peptide for sale online, you will find numerous vendors claiming high purity. However, the FDA has not approved SS-31 for human use, and products labeled for research are not intended for consumption.
Safety and Legal Status of SS-31 Peptide
SS-31 is not FDA-approved for any human medical condition. It is available only as a research chemical, and vendors typically sell it with a "for research use only" label. This means it has not undergone the rigorous safety and efficacy testing required for prescription drugs.
In clinical trials, elamipretide has been generally well tolerated. Common side effects included injection site reactions, headache, and nausea. However, long-term safety data are limited.
Anyone considering SS-31 for personal use should consult a healthcare professional. Self-administering research peptides carries risks, including unknown purity, incorrect dosing, and potential allergic reactions.
Legal status varies by country. In the United States, possessing SS-31 for personal use is not explicitly illegal, but selling it as a drug or supplement is prohibited without FDA approval.
Where to Find SS-31 Peptide for Research
Researchers can purchase SS-31 from specialized chemical suppliers. These vendors should provide a certificate of analysis (COA) and third-party purity testing. Reputable suppliers will also state the peptide is for laboratory use only.
Because SS-31 is not a dietary supplement, it cannot be legally sold for human consumption. Any website claiming SS-31 is a safe treatment for mitochondrial disease is making unproven claims.
If your research involves cell culture or animal models, follow institutional guidelines for peptide handling and storage. Lyophilized SS-31 should be stored at -20°C and reconstituted according to published protocols.
Frequently Asked Questions
Is SS-31 peptide FDA approved?
No, SS-31 (elamipretide) is not FDA-approved for any human condition. It is sold as a research chemical for laboratory use only. Clinical trials have shown mixed results, and the FDA has not granted approval for Barth syndrome or other conditions as of 2025.
What does SS-31 peptide do in the body?
SS-31 binds to cardiolipin in mitochondria, helping to stabilize the inner mitochondrial membrane and improve energy production. It also reduces oxidative stress. These effects are being studied in conditions like heart failure, mitochondrial myopathy, and dry age-related macular degeneration, but no proven human benefits are established.
Can I buy SS-31 peptide online for personal use?
SS-31 is sold online by research chemical vendors, but these products are labeled for research use only and are not intended for human consumption. The FDA has not approved SS-31 for human use, so buying it for personal use carries legal and safety risks. Always consult a healthcare professional before using any unapproved peptide.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.