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    Selank Peptide: A Provider's Guide to Identity, Vial Format, and Access

    Short answer: Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP). PubChem lists it as CID 11765600, molecular formula C33H57N11O9, molecular weight ≈751.9 g/mol, CAS 129954-34-3, with the synonym TP-7 (PubChem). The literature describes it as an analogue of tuftsin, the tetrapeptide Thr-Lys-Pro-Arg (PubChem: Tuftsin; Kolomin et al., 2013). Biomed Peptides lists SELANK in 5 mg and 10 mg lyophilized vials for verified, licensed providers only.

    This guide covers identity, regulatory context, supply format, documentation, and how practices buy the Selank peptide. Clinical decisions stay with the prescribing clinician.

    What is the Selank peptide?

    Sequence and structure

    Selank is short: seven amino acids, three of them proline.

    Attribute Value
    Name Selank (also Selanc; TP-7)
    Sequence (3-letter) Thr-Lys-Pro-Arg-Pro-Gly-Pro
    Sequence (1-letter) TKPRPGP
    Length 7 amino acids
    Molecular formula C33H57N11O9
    Molecular weight ≈751.9 g/mol
    CAS (as listed in PubChem) 129954-34-3
    PubChem CID 11765600

    PubChem also lists a "TP-7 (diacetate)" synonym, and FDA's compounding pages name the substance "Selank acetate (TP-7)" (FDA). That matters when you read a COA. The salt form (here, acetate) changes the weight of the powder in the vial but not the peptide sequence. That's why manufacturers report peptide content separately from purity (Bachem).

    The tuftsin connection

    Tuftsin is a tetrapeptide with the sequence Thr-Lys-Pro-Arg (TKPR) (PubChem: Tuftsin, CID 156080). Tuftsin and its many synthetic derivatives are surveyed in a 2017 review (Siebert et al., 2017). Selank's first four residues are the same TKPR, followed by a Pro-Gly-Pro extension. That's why research papers refer to Selank as a "tuftsin analog" (Kolomin et al., 2013). When staff ask what Selank is, the accurate one-line answer is that it's a synthetic seven-residue peptide built on the tuftsin sequence with a Pro-Gly-Pro tail.

    Regulatory context: FDA's 503A nomination pages

    Under section 503A, a bulk drug substance generally must have a USP or NF monograph, be a component of an FDA-approved drug, or appear on FDA's 503A bulks list. It also needs a valid COA and a section 510-registered manufacturer (FDA).

    Here's what FDA's pages currently show for Selank:

    • FDA's significant-safety-risks page lists Selank acetate (TP-7) under "Bulk drug substances nominated but withdrawn," meaning it was previously in category 2 and the nominators withdrew their nominations. The page summarizes the concerns FDA identified, and providers should read it directly. It's marked current as of April 22, 2026 (FDA).
    • FDA's 503A nominations list (updated May 14, 2026) does not name Selank in category 1, 2, or 3 (FDA nominations list).
    • Selank is not one of the six peptides named in HHS's October 2026 enforcement-discretion notice for 503A peptide compounding (Federal Register, Oct. 30, 2026; McDermott law-firm summary).

    These pages change often. Confirm current status with your compounding pharmacist. For background, see what a 503A pharmacy is.

    How Selank is supplied to clinics

    Lyophilized vial format

    Selank ships as a lyophilized (freeze-dried) powder in a sealed vial. Bachem advises against storing peptides in solution long term, because they "may slowly undergo chemical degradation," and recommends keeping them as a lyophilizate in a tightly closed container (Bachem). Our lyophilized peptides guide explains the format and the reconstitution workflow for clinic staff.

    Vial sizes

    The Biomed Peptides lyophilized catalog lists:

    • SELANK, 5 mg vial
    • SELANK, 10 mg vial

    The two strengths contain the same molecule in different fill amounts. Pick one strength as your practice standard where you can, so your labels, records, and reorders stay consistent. Pricing appears only after a provider account is approved.

    Storage pointers

    • Keep vials sealed, dry, and protected from light. Follow the product label first.
    • For long-term holding, Bachem recommends storing lyophilized peptides below −15 °C, with lower temperatures preferred. Refrigeration at 4 °C is acceptable for short-term use (Bachem).
    • Let a cold vial reach room temperature before opening, because peptides are hygroscopic (Bachem).
    • Use the diluent named on the labeling. See bacteriostatic water for peptides.

    Documentation to request for Selank

    • Lot-specific COA with mass spectrometry identity matching ≈751.9 Da for the free peptide, and HPLC purity with the method stated
    • Peptide content and counter-ion (for example, acetate), so the labeled strength can be reconciled with the weighed powder (Bachem)
    • Endotoxin results where applicable
    • Manufacturer and site information, and the labeled storage conditions and expiration

    Our peptide COA and third-party testing guide covers how to read each section.

    Selank peptide buy: how providers get access

    Searches like "selank peptide buy" mostly lead to consumer storefronts. Biomed Peptides supplies physician-use product only to licensed healthcare providers and GPOs. We don't sell to patients or consumers.

    1. Submit the provider application.
    2. Our team verifies your credentials, usually within 24–48 hours.
    3. Approved accounts can view pricing, the full catalog, and lot documentation.
    4. Order for office use or patient-specific fulfillment, with shipping to all 50 states.

    Who can order and prescribe depends on your license type and your state. Our guide to who can prescribe peptides breaks this down by credential.

    Source Selank for your practice

    Licensed practices and med spas can apply for provider access to view SELANK pricing and COAs for both vial sizes, or browse the lyophilized catalog.

    FAQ

    What is the Selank peptide?

    Selank is a synthetic seven-amino-acid peptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP). PubChem lists it as CID 11765600 with a molecular weight of about 751.9 g/mol.

    Why is Selank called a tuftsin analog?

    Tuftsin is the tetrapeptide Thr-Lys-Pro-Arg. Selank keeps that sequence and adds Pro-Gly-Pro at the C-terminal end.

    What is TP-7?

    TP-7 is a synonym for Selank listed in PubChem. FDA's compounding pages refer to the substance as Selank acetate (TP-7).

    What vial sizes does Biomed Peptides list for Selank?

    SELANK is listed in 5 mg and 10 mg lyophilized vials. Pricing is visible to approved provider accounts.

    Where can a practice buy Selank peptide?

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

    Sources

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