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    SS-31 Peptide: A Provider's Guide to Identity and Sourcing

    Short answer: SS-31 is a synthetic tetrapeptide amide with the sequence D-Arg-Dmt-Lys-Phe-NH2 (Dmt = 2′,6′-dimethyl-L-tyrosine), molecular formula C32H49N9O5, and a molecular weight of about 639.8 g/mol (PubChem CID 11764719). It is also known by the nonproprietary name elamipretide (USAN/INN) and by research codes such as MTP-131 (FDA UNII 87GWG91S09; CAS 736992-21-5). Clinics receive the SS-31 peptide as a lyophilized vial, and Biomed Peptides supplies it only to verified licensed providers.

    This guide covers identity facts your purchasing team needs, how SS-31 appears in our catalog, and how provider access works. It does not cover clinical use.

    What is the SS-31 peptide?

    Chemical identity

    PubChem and the FDA substance registry list the following for SS-31 / elamipretide (PubChem CID 11764719; UNII 87GWG91S09):

    Attribute Value
    Common research code SS-31
    Nonproprietary name Elamipretide (USAN/INN)
    Other codes MTP-131, RX-31
    Sequence D-Arg-Dmt-Lys-Phe-NH2
    Length 4 residues, C-terminal amide
    Molecular formula C32H49N9O5
    Molecular weight ≈639.8 g/mol
    CAS 736992-21-5
    UNII 87GWG91S09

    Non-standard residues

    Two features matter when staff read a COA:

    • D-Arg at position 1 (D-arginine, not the standard L-isomer)
    • Dmt at position 2: 2′,6′-dimethyl-L-tyrosine, not unmodified tyrosine

    Mass spectrometry should land near 640 Da for the free base. A listing that quotes a mass near 611 Da is describing a different tetrapeptide (plain Tyr instead of Dmt)—not SS-31.

    Zhao, Szeto, and colleagues described this Szeto–Schiller peptide series in the Journal of Biological Chemistry in 2004 (Zhao et al., 2004).

    How SS-31 is supplied to clinics

    Lyophilized vial format

    SS-31 comes freeze-dried in sealed vials. Lyophilized powder is more stable in storage and transit than peptide in solution (Bachem). Our lyophilized peptides guide explains the format and reconstitution workflow.

    The Biomed Peptides lyophilized catalog lists SS-31 in 10 mg and 50 mg vials. Pricing appears only after a provider account is approved.

    Storage and diluent

    • Keep vials sealed, cold, dry, and away from light; follow the label first (Bachem).
    • Let a cold vial reach room temperature before opening, so condensation doesn't wet the cake.
    • Limit freeze-thaw cycles.
    • Reconstitute only with the sterile diluent named on the labeling.

    SS-31 peptide buy: how provider access works

    Searches like "ss 31 peptide buy" and "where to buy ss 31 peptide" mostly surface consumer storefronts. Biomed Peptides works differently: we supply physician-use product only to licensed healthcare providers, and we don't sell to patients or consumers.

    1. Apply. Submit the provider application with clinic details and license information.
    2. Verification. Credentials are typically checked within 24–48 hours.
    3. Portal access. Approved accounts see catalog, wholesale pricing, and quality documentation.
    4. Fulfillment. Order for office use or patient-specific fulfillment, with shipping to all 50 states.

    Who can order and prescribe depends on licensure and state rules. See who can prescribe peptides. For compounding-channel background, see what a 503A pharmacy is.

    Documentation to request for SS-31

    • Lot-specific COA: MS identity ≈640 Da, HPLC purity, and peptide content
    • Endotoxin report where applicable
    • Labeled storage conditions and expiration

    Confirm the COA names SS-31 or elamipretide (or an equivalent synonym that maps to CAS 736992-21-5) and does not describe a Tyr-for-Dmt lookalike. Our wholesale peptide supplier guide walks through how to vet that paperwork.

    Source SS-31 for your practice

    Licensed practices can apply for provider access to view SS-31 pricing and lot documentation, or browse the lyophilized catalog.

    FAQ

    What is the SS-31 peptide?

    SS-31 is a synthetic tetrapeptide amide, D-Arg-Dmt-Lys-Phe-NH2 (C32H49N9O5, about 639.8 g/mol). It is also known as elamipretide.

    Is SS-31 the same as elamipretide?

    Yes. Elamipretide is the USAN/INN; SS-31 and MTP-131 are research codes for the same structure (CAS 736992-21-5).

    How is SS-31 supplied to clinics?

    As a lyophilized powder in sealed vials. Biomed Peptides lists 10 mg and 50 mg strengths.

    Where can a practice buy SS-31 peptide?

    From a provider-only supplier that verifies licensure. Biomed Peptides supplies SS-31 to approved providers through /apply.

    Can patients buy SS-31 online from Biomed Peptides?

    No. Biomed Peptides does not sell to consumers. Orders go through a licensed healthcare provider.

    Sources

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