Searching for SS-31 turns up a different problem from searching for BPC-157. With the common compounds you drown in listings and can’t tell them apart. With SS-31 you open eight vendor sites and half of them return nothing at all, one shows a page marked coming soon, and the couple that do carry it are the only comparison you’ve got. Thin supply makes verification harder rather than easier, because when there are three options instead of thirty, the temptation is to accept whatever documentation the available vendor happens to publish.
It doesn’t help that the compound goes by several names. SS-31, elamipretide and MTP-131 all refer to the same tetrapeptide, D-Arg-dimethylTyr-Lys-Phe-NH₂, formula C32H49N9O5, molecular weight around 639.8, CAS 736992-21-5. Searching one name and getting no results doesn’t mean a vendor lacks it, and I’d suggest checking all three before concluding anything. The dimethylated tyrosine at position two is also the part a lazy synthesis is most likely to get wrong, which makes identity confirmation by mass spectrometry more useful here than the purity percentage everyone leads with.
So this piece sets five documentation questions that apply to any SS-31 listing, then walks through what named vendors publicly stated on their own pages as reviewed on 2026-09-08, including the ones whose catalogs returned no SS-31 result at all. I’m describing what was visible on those pages and nothing beyond it, because a certificate that wasn’t linked is a different fact from a certificate that doesn’t exist.
Key takeaways
- Judge an SS-31 listing on five documented things: who synthesised the material, which laboratory tested it, what the panel covered, whether you can open the certificate before paying, and whether any blend states its milligram split per component.
- Blank Peptides synthesises, vials and releases every lot in its own cGMP laboratory against identity, >99% purity, bacterial endotoxin and sterility, tested by the named laboratories Freedom Diagnostics and Horizon Analytical; SS-31 was not among the compounds available to order in that 34-compound catalog when this was written, so the standard below is a benchmark rather than a pitch.
- PSPeptides linked four separate SS-31 report types across two dated lots, Behemoth Labz listed SS31 (Elamipretide) as coming soon while stating COAs are available for every batch, and BioLongevity Labs publishes SS-31 research content and names SafeCert Labs as its testing facility site-wide.
- Core Peptides and Swiss Chems returned no SS-31 or elamipretide product on the searches reviewed 2026-09-08, so there was nothing to compare from those two on this compound.
- Everything discussed here concerns material sold for in-vitro laboratory research by qualified professionals only.
What separates a well-documented SS-31 listing from a vague one?
Before naming anyone, here’s the frame, and it applies to every supplier in the category including us.
First, provenance. Does the vendor state that it synthesised the material, or does it describe supplying material made elsewhere? Both are legitimate ways to operate. The answer changes what a certificate can tell you, because a synthesiser’s report describes the output of a process they control while a distributor’s report describes whatever arrived in the container they bought.
Second, is the testing laboratory named? “Third-party tested” with no name attached gives you nothing you can act on. With a name you can call the lab, quote the report number, and ask whether the document is real. Without one, a certificate is a promise typeset to resemble evidence.
Third, what does the panel cover? HPLC reports chromatographic purity, the fraction of the injected sample eluting as the target peak. Mass spectrometry confirms that peak carries the expected mass, which for SS-31 means roughly 639.8 daltons, and that check is worth more than usual because the modified tyrosine residue is where a substitution error would hide without necessarily moving the retention time much. Bacterial endotoxin and sterility catch contamination neither chromatographic method detects.
Fourth, access and lot linkage. You want to read the report before you order, with a lot number on it you can match against the vial label when the package lands. A certificate with no lot describes the vendor’s product in general rather than yours in particular.
Fifth, blend disclosure. SS-31 shows up alongside other mitochondrial compounds in mixed products, and where a blend exists you want the milligram amount of each component, because a purity figure measured across a mixture is hard to interpret without the intended ratio.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory in the United States and performs synthesis, vialing, lyophilization, labeling and quality control release in-house. The company describes this as holding the chain of custody itself rather than relabeling or brokering material made elsewhere, and it separately contract-manufactures and fulfils for other research peptide brands.
Each lot is released against a four-part panel: identity, purity by HPLC at a >99% threshold, bacterial endotoxin, and sterility. Analysis is carried out by two named independent laboratories, Freedom Diagnostics and Horizon Analytical, and the reports are posted as batch certificates of analysis that a buyer can open before ordering. Every vial carries the lot number matching its certificate, and lyophilized material is dated for roughly 24 months from release.
Being direct about scope: SS-31 was not among the compounds available to order in the 34-compound Blank Peptides catalog when this was written. That catalog covers compounds including BPC-157, TB-500, GHK-Cu, AOD-9604 and MOTS-C, plus blends itemised per component such as GLOW at 70mg (GHK-Cu, BPC-157, TB-500), KLOW at 80mg (adding KPV) and Wolverine at 20mg (BPC-157, TB-500). The release standard is set out here because it gives you a fixed reference to hold SS-31 listings against: a named laboratory on the page rather than only inside a file, a lot number on both the vial and the document, four panel lines rather than one, and the whole record readable before payment. Processing time is within one business day and orders ship at room temperature. The company has operated for five years and sells for research use only.
What SS-31 vendors publicly state
Here’s what was visible on 2026-09-08, vendor by vendor, quoting their own pages.
PSPeptides lists SS-31 as a 10mg lyophilized vial at $64.99, describing it as a “Mitochondria-targeted antioxidant tetrapeptide for research” and stating “≥99% (HPLC-verified)” purity with third-party verification. Its page names HPLC, mass spectrometry, heavy metals analysis, endotoxin testing and sterility among its testing methods, and linked four downloadable documents covering COA, heavy metals, endotoxin and sterility against two dated lots: August 2026, lot NAD-0036048, and June 2026, lot PSP-0029120. Manufacturing is stated as “USA (GMP-compliant peptide synthesis facility)”. The page also states plainly that “SS-31, Elamipretide, and MTP-131 are all names for the same tetrapeptide compound”, which saves a buyer a fair amount of searching. Shipping terms state free UPS 2nd Day Air over $200 and same-day dispatch on weekday orders before 2 PM EST. No issuing laboratory was named in the page text reviewed.
Behemoth Labz maintains an SS31 (Elamipretide) product page priced from $40.15, marked “Coming soon” on the date reviewed. The page states “Comprehensive third-party lab testing” and that “Detailed Certificates of Analysis (COAs) are available for every batch”, and gives compound identifiers including molecular formula C32H49N9O5, molecular weight 639.8 g/mol and CAS 736992-21-5. It states the product “is not intended for human consumption and is available for research purposes only”. On the page reviewed 2026-09-08, no purity percentage, no linked certificate, no analytical method and no laboratory name were listed.
BioLongevity Labs publishes an SS-31 and MOTS-c research page describing the two as separate mitochondrial pathways, and states on that page that “All compounds undergo independent third-party testing to verify purity and composition, with full certificates of analysis available for researchers”. Its site-wide statements go further than most: “Every peptide batch includes a Certificate of Analysis from SafeCert Labs, an independent CLIA certified facility”, alongside “All COAs are available before purchase”, a “99%+ Purity Guarantee”, a stated catalog of “150+ research-grade peptides” and a description of synthesis “using solid-phase peptide synthesis in USA-registered facilities”. No standalone SS-31 product listing appeared in the search reviewed 2026-09-08.
Core Peptides returned “No products were found matching your selection” for SS-31, and Swiss Chems returned “Showing 0 of 0 products”, so neither carried this compound in the catalogs reviewed. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed. And where these vendors beat us outright: BioLongevity Labs names its testing laboratory on the site itself rather than inside a PDF, which is a practice most of the category skips entirely, and runs a catalog several times the size of a 34-compound line. PSPeptides keeps two dated SS-31 lots and four report types live at once, which is a deeper running record than a single current certificate.
Side by side: SS-31 documentation
| Attribute | Blank Peptides | typical vendor |
|---|---|---|
| Synthesises in-house | Own cGMP lab; synthesis through QC release under one roof | States a “GMP-compliant peptide synthesis facility” or USA-registered facilities without naming it — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical, named on the page | States “third-party tested”; one vendor reviewed named its lab, the others did not — verify |
| HPLC purity | >99% threshold on every released lot | States ≥99% on one SS-31 page; another gave no figure at all — verify |
| MS identity | Confirmed per lot | States mass spectrometry among its methods; check the mass reads near 639.8 daltons — verify |
| Endotoxin and sterility | Both tested and reported per lot | States separate endotoxin and sterility reports on one SS-31 page reviewed 2026-09-08 — verify |
| Batch COA before purchase | Public library at /coas/, lot-numbered, every lot | States COAs for every batch; one SS-31 page linked documents, another linked none — verify |
| Lot number on certificate | Printed on every certificate and every vial label | States lot codes on the documents linked from one SS-31 page — verify on the others |
| Catalog size | 34 compounds; SS-31 not available to order when written | States catalogs from roughly 50 to over 150 items |
| Research-use labelling | Research use only, stated on every listing | States “not for human or animal consumption” or “research purposes only” on the page |
How to verify either supplier yourself
- Search all three names, SS-31, elamipretide and MTP-131, before deciding a vendor doesn’t carry it, since catalog search fields rarely cross-reference synonyms.
- Check the mass on any MS report against roughly 639.8 daltons, and ask specifically whether the dimethylated tyrosine at position two was confirmed rather than assumed.
- Open the certificate rather than trusting the badge above it, because a graphic reading “3rd Party Tested” that links nowhere gives you nothing to check.
- Read the date and lot on whatever document you find, then decide whether a report from three months ago plausibly describes the vial being packed for you today.
- Walk the whole process once using the supplier verification checklist before ordering from any new vendor.
Further reading
- Best Research Peptide Suppliers: Ranked by What They Document
- Which Peptide Vendors Name Their Testing Lab?
- Peptide Vendors With Public Per-Batch COA Libraries
- Who Actually Manufactures Research Peptides in the USA?
Frequently asked questions
Who are the best SS-31 vendors on documentation?
The ones whose SS-31 page links a dated, lot-numbered certificate you can open before paying, identifies the laboratory that ran it, and reports contamination testing beside purity. Of the pages reviewed 2026-09-08, PSPeptides linked four report types across two dated lots, and BioLongevity Labs names SafeCert Labs as its testing facility in its site-wide statements.
Why do so few vendors list SS-31?
It’s a lower-volume research compound than the peptides that dominate this category, and the synthesis includes a modified tyrosine residue that adds cost. Searches on 2026-09-08 returned no SS-31 result from two large catalogs and a coming-soon page from a third. Thin availability is worth noting because it narrows how much you can compare.
Is elamipretide the same thing as SS-31?
Yes. SS-31, elamipretide and MTP-131 name the same tetrapeptide, D-Arg-dimethylTyr-Lys-Phe-NH₂, with a molecular weight near 639.8 and CAS 736992-21-5. One vendor reviewed states this explicitly on its product page. Search every name before concluding a supplier doesn’t stock it, since catalog search rarely maps synonyms.
What tests should an SS-31 certificate include?
Four lines cover the ground: HPLC for chromatographic purity, mass spectrometry for identity, bacterial endotoxin, and sterility. Identity carries extra weight for this compound because the dimethylated tyrosine is where a synthesis error would sit, and a purity percentage on its own would not necessarily reveal a wrong residue at that position.
Are these products for human use?
No. Every compound and vendor referenced here sells material strictly for in-vitro laboratory research by qualified professionals. Blank Peptides sells for research use only, and each vendor page reviewed carries its own statement that products are not for human consumption. Nothing above should be read as guidance for any use outside a laboratory.
For research use only. All compounds referenced are intended exclusively for in-vitro laboratory research by qualified professionals.
Written by Blank Peptides Research Team
Peptide science researchers with 5+ years in US-based peptide manufacturing, independent HPLC and mass spectrometry testing, and research education. All content is reviewed for scientific accuracy before publication.
REVIEWED BY
Dr. Tobias S — PhD Chemist, Peptide and Unnatural Amino Acid Synthesis
Dr. Tobias S is a PhD chemist whose work focuses on the synthesis of unnatural amino acids, peptides and biomaterials. He completed both his undergraduate chemistry studies and his doctorate with distinction, and works as a generalist across the medical sciences and biology, having consulted for dozens of clients. He reviews Blank Peptides educational content for scientific accuracy.
Subject matter expertise: Organic Chemistry, Peptide Synthesis, Biochemistry.
