SS-31 is the research-chemical name for elamipretide, a four-amino-acid peptide that concentrates more than 1,000-fold inside the inner mitochondrial membrane. In September 2025 the FDA granted its clinical version accelerated approval for one ultra-rare disease. The version on peptide vendor sites is not that drug, and almost no buyer's guide tells you the difference.
If you've been searching where to buy SS-31, this guide cuts through the marketing. You'll learn exactly what is being sold, who sells it credibly, what it should cost in 2026, how to read a real certificate of analysis, and which red flags quietly separate a clean batch from an underdosed vial. SS-31 (elamipretide) sits in an unusual spot: a genuine approved medication exists, but the "SS-31 for sale" you find online is research-grade material sold for laboratory use only.
Key Takeaways
- SS-31 and elamipretide are the same molecule, but they are not the same product. The FDA-approved version (Forzinity) is prescription-only for Barth syndrome. Research-grade SS-31 is sold "for research use only" and is not approved for any other purpose.
- Ascension Peptides is our top-rated source: batch-specific third-party COAs, ≥98% HPLC purity, lyophilized format, and US domestic shipping.
- Always demand a batch-specific COA that matches the lot number on your vial, not a generic product certificate. Purity should read ≥98% by HPLC.
- Expect roughly $50–$130 for a 10mg vial. Anything far below that range usually means skipped testing, not a real bargain.
- No prescription exists for research SS-31. It ships as a freeze-dried powder you reconstitute with bacteriostatic water.
What SS-31 (Elamipretide) Actually Is
SS-31 is a synthetic tetrapeptide from the Szeto-Schiller family, originally developed by researchers Hazel Szeto and Peter Schiller. Its sequence is D-Arg-2',6'-dimethyltyrosine-Lys-Phe-NH₂, and the inclusion of a D-amino acid and a non-natural tyrosine residue is what makes it cell-permeable and resistant to rapid breakdown. Once inside a cell it selectively binds cardiolipin, a phospholipid unique to the inner mitochondrial membrane, where it concentrates more than a thousandfold. The research interest centers on whether stabilizing cardiolipin helps preserve mitochondrial structure and energy production under stress.
Under the development codes SS-31 and MTP-131 (and the older name Bendavia), the compound has been studied in human trials for primary mitochondrial myopathy, heart failure, dry age-related macular degeneration, and other conditions. Most of those programs did not reach approval. The one that did is Barth syndrome, a rare inherited mitochondrial disorder: in September 2025 the FDA granted elamipretide accelerated approval under the brand name Forzinity, a subcutaneous injection for eligible patients. That approval is narrow and does not make grey-market SS-31 a medicine.
Where to Buy SS-31 in 2026
There is no general pharmacy counter for SS-31. Forzinity is prescription-only and restricted to Barth syndrome, so unless you qualify for that specific indication, the realistic sourcing options are research-chemical peptide vendors. These companies sell SS-31 as a lyophilized powder labeled "for research use only," and they do not require a prescription.
That convenience comes with a catch: the market is unregulated, and quality ranges from genuinely lab-verified to mislabeled and underdosed. Dozens of vendors list SS-31. A handful test every batch through an independent lab and publish the results; many recycle a single generic certificate or publish nothing at all. So the honest answer to "where to buy SS-31" is less about which website has the product and more about which vendor can prove what is in the vial. That verification step is where the entire decision lives.
Best Place to Buy SS-31: Ascension Peptides
Ascension Peptides is the vendor we recommend for SS-31, and not because of commission. They do the parts of this that most vendors skip.
Batch-specific third-party testing. Ascension publishes COAs tied to the actual lot you receive, from independent labs, rather than a single product-level certificate that may predate your batch by months.
Purity standards. Their SS-31 tests at ≥98% by HPLC. For a tetrapeptide that has to fold and bind correctly, the gap between 98% and an unverified "99%" claim matters for accurate research dosing.
Lyophilized and in stock. It ships as a freeze-dried powder with clear storage guidance, and stock status is transparent rather than perpetually "back soon."
US domestic shipping and honest pricing. You pay for the lab work that separates a clean vial from cheap material, not for marketing. Check current pricing and availability at Ascension Peptides.
How to Verify SS-31 Quality: The COA
Most guides say "look for third-party testing" and stop there. Here is what actually separates a real certificate from a decorative one.
Batch-specific, not product-level. A product-level COA covers a product line and could reflect a synthesis run from six months ago. A batch-specific COA references the exact lot number printed on your vial, with a testing date and results that correspond to what you received. The lot on the vial should match the lot on the certificate. If it doesn't, or there's no lot number at all, treat it as unverified.
HPLC for purity, MS for identity. High-Performance Liquid Chromatography (HPLC) tells you what percentage of the sample is actually SS-31. Look for ≥98%; 95% is borderline, and lower is a red flag. Mass spectrometry confirms the molecular weight matches the tetrapeptide's structure, so you know it's the right compound and not just a pure something-else. The best COAs include both, and the strongest also add amino acid analysis.
Verifiable labs. Names like Janoshik and Colmaric Analyticals run public portals where you can cross-check a certificate ID. If the "lab" has no website and the certificate has no chromatogram image, it proves nothing.
What SS-31 Costs in 2026
Price tracks vial size and whether the vendor actually pays for testing.
- 5mg vials: roughly $40–$75. A low-commitment way to verify a vendor before buying larger.
- 10mg vials: roughly $50–$130. The most common size; quality vendors sit in the middle of this band.
- 25mg–50mg vials: roughly $100–$200, better per-milligram value but only worth it once you trust the vendor's COAs.
- Bacteriostatic water: $8–$15, needed separately for reconstitution.
Several vendors list 10mg around $50, and 50mg around $150, with multi-vial boxes (for example, ten-vial cases) bringing the per-vial cost down. Be skeptical of anything dramatically under range. The most common corner to cut is the testing, which is exactly the part you're paying for.
Red Flags to Avoid
- No COA, or a generic one only. A product-level certificate with no lot number is a non-answer. No batch-specific COA, no sale.
- Prices that seem too good. A verified 10mg vial costs money to synthesize and test. A $20 vial with free shipping cut something out of that chain.
- Pre-mixed "ready to use" solutions with no batch date. SS-31 should arrive lyophilized; a pre-dissolved product with no documentation is a stability and labeling risk.
- Human-use or cure claims. A vendor that sells a "research chemical" while telling you how to dose it for anti-aging or athletic performance is talking out of both sides of its mouth.
- False approval language. Any site implying SS-31 itself is "FDA-approved" is misrepresenting things. Only the narrow Barth syndrome indication for Forzinity is approved.
- No track record. Vendors with zero presence in research and peptide communities, positive or negative, deserve caution.
How to Get SS-31 (and Reconstitute It)
For research-grade SS-31 there is no prescription step. You order online from a vetted vendor, and it arrives as a freeze-dried powder. Before any research use it is reconstituted with bacteriostatic water (the benzyl alcohol preserves the solution for weeks); plain sterile water doesn't offer the same shelf life.
Storage matters because degraded peptide is wasted money. Keep the unreconstituted powder refrigerated at 2–8°C (it tolerates brief room-temperature shipping), store reconstituted solution at 2–8°C and use it within about 3–4 weeks, never freeze the reconstituted vial, and keep it out of direct light. Buying decisions follow from dosing: research literature commonly references low single-digit milligram daily amounts, so a 10mg vial doesn't last long, which is why per-milligram pricing and verified purity are worth getting right before you order.
SS-31 Vendor Comparison
Top Vendors
Ranked by purity, third-party testing, COA availability, and price.
≥99% HPLC/MS · COA + AAA · US
99%+ (lot tracked) · HPLC per batch · US
99%+ · COA included · US
Listed · Claimed · US/intl
Prices are approximate and change frequently. Always confirm current pricing and batch-specific COA availability before purchasing.
Related Buying Guides
Use these next if you are comparing adjacent research-peptide sourcing decisions:
Frequently Asked Questions
Where can I buy SS-31?
Research-grade SS-31 (elamipretide) is sold by peptide vendors as a lyophilized powder for research use only. Our top recommendation is Ascension Peptides, which provides batch-specific third-party COAs, ≥98% HPLC purity, and US domestic shipping. The FDA-approved version, Forzinity, is prescription-only and limited to Barth syndrome.
Is SS-31 legal to buy?
SS-31 sold as a research chemical is not a scheduled substance, and buying it for laboratory research from a domestic vendor carries low legal risk in practice. It is not approved for human use outside the narrow Barth syndrome indication, so you are operating outside the standard pharmaceutical system. Laws vary by jurisdiction, so check local rules before ordering, especially internationally.
How much does SS-31 cost?
Expect roughly $40–$75 for a 5mg vial, $50–$130 for a 10mg vial, and $100–$200 for 25–50mg sizes in 2026. Bacteriostatic water for reconstitution runs $8–$15 separately. Prices well below these ranges usually signal skipped testing rather than a genuine discount.
How do I know my SS-31 is real and high purity?
Demand a batch-specific certificate of analysis whose lot number matches your vial. It should show ≥98% purity by HPLC with a chromatogram, and ideally mass spectrometry confirming identity. Verify the testing lab exists and has a public portal (Janoshik and Colmaric are examples). No lot number or an unverifiable lab means the certificate is unproven.
Do I need a prescription for SS-31?
Not for research-grade SS-31, which vendors sell without a prescription for research use only. A prescription only applies to the approved drug elamipretide (Forzinity) for Barth syndrome, which is dispensed through normal pharmaceutical channels.
Are SS-31 and elamipretide the same thing?
Chemically, yes, they are the same tetrapeptide. The distinction is regulatory and practical: "elamipretide/Forzinity" refers to the FDA-approved, manufactured, prescription medication for Barth syndrome, while "SS-31" on a vendor site refers to research-grade material sold for laboratory use that has not gone through that approval and manufacturing process.
The Bottom Line on Where to Buy SS-31
SS-31 is one of the more scientifically interesting peptides on the market, and the September 2025 approval of elamipretide for Barth syndrome shows the underlying mechanism is real, not marketing. But the vial in a research vendor's catalog is not that approved drug, and the market around it rewards buyers who verify rather than trust. The order of operations is simple: COA first, vendor reputation second, price last.
Ascension Peptides clears all three. Batch-specific testing, ≥98% HPLC purity, and pricing that's competitive without being suspiciously cheap. If you're ready to buy SS-31, that's where I'd start.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Research-grade SS-31 is sold for laboratory research use only and is not approved to diagnose, treat, cure, or prevent any disease. The approved drug elamipretide (Forzinity) is limited to its labeled indication and requires a prescription. Always consult a qualified healthcare provider before beginning any new compound or protocol. The purchase and use of research peptides carries legal and health risks that vary by jurisdiction and individual circumstances.
