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Injection · 5 mg · vial
Xeno Laboratories Selank is a 5 mg lyophilized vial of the synthetic heptapeptide TKPRPGP, a designed analog of the endogenous tetrapeptide tuftsin, supplied as research material.
GMP-manufactured and HPLC-verified, with a Certificate of Analysis per batch, reconstituted with bacteriostatic water and shipped internationally and to the United States.
Xeno Laboratories Selank is a 5 mg lyophilized vial of a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, written TKPRPGP. It was designed as an analog of tuftsin, a short peptide the body produces to modulate immune signalling, and it was developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. The chemistry is documented: a mass of about 752 g/mol, CAS 129954-34-3 and PubChem identifier 11765600. Because it is a short central-peptide research material, it is normally held in the laboratory next to Semax and Selank from the Generic Peptides line rather than beside a hormone.
Published descriptions link the peptide to the GABA system and to the balance of monoamine signalling, with effects on anxiety-like behaviour reported in animal models. The immunological angle inherited from tuftsin appears in the same literature, mainly as changes in cytokine expression. None of this amounts to established human pharmacology: no human half-life has been determined, and no human side effects profile has been reported. The mechanism described above is a summary of hypotheses, not of confirmed human action.
Bacteriostatic water is added down the wall of the vial, and the solution is swirled rather than shaken because the chain is delicate. Concentration is the milligrams on the label divided by the millilitres added, so the unit value per syringe graduation changes whenever the diluent volume changes.
Selank holds a Russian registration and is not approved by the FDA or the EMA, so outside Russia it circulates as a research material, which is precisely how this vial is supplied. The peptide is not named by name on the WADA Prohibited List, but that reflects the absence of a recorded decision rather than permission, and the current edition of the list remains the only authority for anyone under testing rules. No amount is recommended on this page and no protocol is described.
For laboratory research only. Not for human or veterinary use. Information provided is for educational purposes only and does not constitute medical advice. Consult a healthcare professional before use.
| Trade Name | Selank |
| Generic Name | Selank (TKPRPGP heptapeptide) |
| Manufacturer | Xeno Laboratories |
| Dosage | 5 mg per vial |
| Package | Lyophilized powder, one vial |
| Drug Class | Research heptapeptide |
| Administration | Laboratory reference material only |
| Storage | Sealed powder cold and dry, mixed solution 2 to 8 C |
| Prescription Status | Registered in Russia, not FDA or EMA approved |
| Verification | Third-party HPLC per batch, COA on file |
| Shipping | International and U.S. domestic options |
For laboratory research only. Consult a healthcare professional before handling any peptide. Amounts shown are research references, not recommended human doses.
Before you ask
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, known in short form as TKPRPGP. It was designed as an analog of tuftsin, a naturally occurring short peptide involved in immune signalling, and it was developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. Its mass is about 752 g/mol, the CAS number is 129954-34-3 and the PubChem identifier is 11765600.
It holds a registration in Russia and is not approved by the FDA or the European Medicines Agency, so outside Russia it is handled as a research material, which is how this vial is supplied. A national approval does not transfer to other regulators, and the Russian clinical material describes nasal use of a diluted solution under medical supervision. That is a regulatory fact, not a protocol, and nothing here is offered for administration.
It is limited. Most of the clinical reporting comes from a small number of Russian centres and appears in journals that are not widely indexed, so independent replication is difficult to verify. Mechanistic work on the GABA system and on monoamine balance is largely animal based. No human half-life has been established for the peptide, and reviews of the material describe the overall evidence base as thin rather than settled.
Add bacteriostatic water down the side of the vial and swirl, do not shake, because the peptide chain is fragile. The concentration is set by the volume of diluent, so the value represented by each syringe graduation changes with it; published vendor arithmetic for a 5 mg vial is a calibration example for laboratory measurement, not an amount to take. Keep the powder cold and dry and the mixed solution at 2 to 8 C.
The peptide is not named by name in the list that was checked. Absence of a name is an absence of data, not a permission: it means no anti-doping decision has been recorded for the substance, and a tested athlete should not read an unlisted research peptide as cleared for use. The list is revised on a regular cycle, so the current edition is the only authority, and this card makes no claim beyond that.
This 5 mg vial is listed as research material with international checkout and a U.S. domestic option. Orders are handled within one to two business days and each batch ships with an HPLC report and a Certificate of Analysis. Stock, variant and the current price are shown in the product block above; at the time of checking, the listing carried an out of stock marker while packs are restocked, so confirm the stock line before ordering.
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