Sourcing guide · research use only
Where to buy Selank for research.
Selank is a short synthetic heptapeptide — the tuftsin core (Thr-Lys-Pro-Arg) extended with a Pro-Gly-Pro tail, sequence TKPRPGP — studied in laboratory neuroscience research and supplied as a ready-to-use intranasal solution rather than a powder you reconstitute. Built on a known fragment, with three prolines and sold by concentration, it has verification points a generic purity number will miss. This guide covers what to verify before buying Selank, why its certificate of analysis differs from a lyophilized vial’s and even from its look-alike Semax spray, and the in-catalog Selank research sprays Titan actually stocks. It makes no human-use, dosing, or efficacy claims.
Before you buy
What a Selank nasal-spray COA must prove.
A Selank document has to do everything a short-peptide COA does — confirm the full seven-residue sequence by mass spec and account for proline peak shape — and then prove the thing a powder vial never has to: the concentration and stability of a liquid product. Run any Selank listing against this table before you trust the purity number on it.
| What to check | What a real COA shows | Red flag |
|---|---|---|
| Full-sequence identity (MS) | Mass spectrometry confirming the complete seven-residue chain — the tuftsin core (Thr-Lys-Pro-Arg) extended by the Pro-Gly-Pro tail. The characteristic synthesis defect is a chain that stops before the proline-rich tail is finished, leaving a fragment that is not Selank; only full-sequence MS catches it | A purity number, or an MS that only confirms the tuftsin core and not the whole TKPRPGP heptapeptide |
| Proline peak-shape (HPLC) | Selank carries three prolines, which produce cis/trans isomerization — that can broaden or split HPLC peaks. A real COA shows the chromatogram and accounts for the peak shape against the correct sequence, not a single idealized spike | A flat "99%+" with no chromatogram, so you cannot see whether proline isomer peaks were counted as impurity or hidden |
| Nasal-spray concentration & fill | For a ready-to-use intranasal solution, the spec should state the peptide concentration per spray and the fill volume. Titan's Selank spray is dosed at a different concentration than its look-alike Semax spray — the bottles resemble each other, so the concentration on the document is what tells them apart | A nasal spray sold with no stated concentration or fill, or a document copied from a different product |
| Solution stability & storage | Because the product ships already in aqueous solution (not lyophilized powder), documentation should address storage and stability of the prepared liquid — an aqueous peptide is less forgiving than a sealed dry vial | Silent on storage or expiry of a liquid product, as if it were a stable powder |
| Lot / batch + compliance | A lot code matching the unit you receive, with documentation silent on human use | A generic reused COA, a mismatched lot, or human-use / dosing / anti-anxiety claims |
Selank is a tuftsin-core heptapeptide — confirm the whole chain
Selank is a synthetic seven-residue peptide: the immunopeptide tuftsin (Thr-Lys-Pro-Arg) extended with a Pro-Gly-Pro tail, giving the sequence TKPRPGP, studied in laboratory neuroscience research. Because the molecule is built on a known shorter fragment, the failure mode is specific — a synthesis can stop after the tuftsin core and leave a truncated chain with a similar look but a different mass. That is why a Selank certificate of analysis must confirm the full seven-residue sequence by mass spectrometry, not just report a purity percentage or identify the core.
How to read a COA →Three prolines change how you read the HPLC
Selank's Pro-Gly-Pro tail plus the proline in the tuftsin core give it three prolines, and prolines undergo cis/trans isomerization. In practice that can broaden or split HPLC peaks for the same correct molecule. A document that just prints "99%+" hides whether those isomer peaks were honestly counted; a real COA shows the chromatogram run against the correct sequence so you can see the peak shape for yourself.
Selank nasal spray →What Titan stocks in the nasal-peptide space
Titan lists Selank as an in-catalog research nasal spray, HPLC-verified and supplied for research use only. It also stocks Semax — the heptapeptide studied alongside Selank in the neuroscience literature — as its own nasal spray, plus a matched Selank + Semax research stack. For the stack, the COA standard doubles: the documentation has to verify both peptides, not one. This is a documented short-peptide cluster you can check against a lot-matched COA.
Selank + Semax stack →Red flags on Selank listings
Walk away from any Selank source whose documentation carries anxiolytic, stress, mood, or other human-use claims — that is a compliance red flag, not a quality spec. Be skeptical of a spray sold with no stated concentration (especially since Selank and Semax bottles look alike at different strengths), a COA that gives a purity number with no chromatogram or full-sequence mass-spec identity, a liquid product silent on storage, a reused generic document, or a lot code that does not match the unit.
What a documented supplier looks like →How Titan fulfills nasal-peptide research orders
Documented, lot-matched, crypto checkout.
- 1. Verify the document before the molecule. For a short peptide in solution, confirm the COA shows a chromatogram, names the HPLC method, confirms the full seven-residue identity by mass spectrometry, and states the concentration of the liquid — a proline-rich heptapeptide spray is more than a residue list and a percentage.
- 2. Lot-matched documentation. Titan’s in-catalog Selank and Semax nasal sprays ship referenced to a batch code with an HPLC purity target and identity confirmation.
- 3. Crypto-only checkout. USDC, BTC, and SOL accepted; stablecoin keeps the total fixed from cart to on-chain confirmation.
- 4. Verify it yourself. Match the lot code to the unit, confirm the concentration (Selank and Semax look alike at different strengths), and read the chromatogram — don’t accept a purity number on a short, in-solution peptide without one.
Selank is a synthetic heptapeptide studied in laboratory neuroscience research and supplied as an intranasal solution. Titan lists it in-catalog alongside Semax and a matched Selank + Semax research stack, all HPLC-verified and lot-matched. Everything here is supplied strictly for research use only, with no human-use, dosing, or efficacy claims. This page is about sourcing and verification, not use.
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