Selank
Synthetic analogue of tuftsin (Thr-Lys-Pro-Arg-Pro-Gly-Pro)
A synthetic peptide developed in Russia from tuftsin, a fragment of an antibody protein. It is studied in rodent models of anxiety and stress and is registered as a medicine only in Russia.
Structure
The immune peptide tuftsin (TKPR) extended with a Pro-Gly-Pro tail that slows its breakdown. Select any residue to see what it is.
Evidence at a glance
Where the published research on Selank comes from, by type of study.
Cell studies
Gene expression and GABA-related signalling in neural cells.
Animal studies
Anxiety, stress and memory models in rats and mice.
Human studies
Clinical studies come from Russia and have not been replicated in the US, UK or EU.
Research areas
What laboratories have studied Selank for, and in which models. These are research questions, not proven uses.
Anxiety and stress models
Rat behavioural tests- Reduced anxiety-like behaviour in rodent models.
Neural gene expression
Rodent brain tissue- Changes in expression of genes linked to GABA signalling and BDNF.
Legal status
Selank is not an approved medicine anywhere we cover. Suppliers may sell it for laboratory research only, and regulators judge that by the whole website, not the label.
United States Not approved
Not FDA-approved for any human use. May be sold for laboratory research only; FDA judges intended use from the whole website, not the label.
United Kingdom Not licensed
No MHRA licence. Sold with medicinal claims it counts as a medicine under the Human Medicines Regulations 2012.
European Union Not authorised
No EMA authorisation. Under Directive 2001/83/EC a substance can be a medicine by function, whatever its label says.
Sport Check S0
Not approved for human use, so it falls under WADA's S0 non-approved substances class. Check the current list.
Lab handling
General good practice for research materials. Follow the supplier's datasheet where it differs.
Storage
Keep the sealed material at −20 °C, dry and away from light. Let the vial reach room temperature before opening to stop condensation.
Solubility
Soluble in sterile water. Add solvent down the vial wall and swirl gently rather than shaking.
Aliquots
Split solutions into single-use aliquots, label with lot number and date, and freeze. Avoid repeated freeze-thaw cycles.
Work out your stock solution
Stock concentration, molarity and dilutions for Selank, using MW 751.88 g/mol.
Before you buy for your lab
Tick each check as you confirm it with the supplier. Do not order until all six are done.
Questions researchers ask
What is Selank?
A synthetic peptide developed in Russia from tuftsin, a fragment of an antibody protein. It is studied in rodent models of anxiety and stress and is registered as a medicine only in Russia.
What is the molecular weight of Selank?
About 751.88 g/mol for the free peptide. Salt forms such as acetate weigh more, so use the figure on your batch certificate of analysis.
Is Selank approved for human use?
No. Not FDA-approved for any human use. May be sold for laboratory research only; FDA judges intended use from the whole website, not the label.
How should Selank be stored in the lab?
Keep the sealed material cold, dry and away from light, typically at −20 °C. Once in solution, split it into single-use aliquots and freeze to avoid repeated freeze-thaw cycles.
Does this page give doses?
No. We publish laboratory and educational information only, never doses, injection guidance or treatment advice.
Is Selank legal in the US?
It is not FDA-approved and was not part of the July 2026 advisory committee vote. Research material may be sold for laboratory use only.
Is Selank legal in the UK?
Selank it is not licensed by the MHRA. Selling it with medicinal claims makes it an unlicensed medicine under the Human Medicines Regulations 2012, so UK suppliers can only offer it for laboratory research. Because it is studied for effects on the brain, the Psychoactive Substances Act 2016 may also be relevant; check with a UK lawyer before importing or supplying it.
Selank vs Semax: what is the difference?
Both were developed in Russia. Selank is a tuftsin analogue studied mainly in anxiety models. Semax is an ACTH(4-10) analogue studied mainly for cognition and neuroprotection. See our Semax profile or the full Selank vs Semax comparison.
What is the amino acid sequence of Selank?
Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP), with a molecular weight of about 751.9 g/mol.
What is the half-life of Selank?
There is no reliable published half-life for Selank in humans in English-language literature. No reliable human pharmacokinetic data have been published, so treat any half-life figure quoted by sellers with caution.
Is Selank banned by WADA?
It is not approved in WADA-recognised jurisdictions, so it falls under the S0 non-approved substances class, which is prohibited at all times.
