Name: Selank 5mg (10 Vials / Kit)
Brand: HK Peptide
SKU: HK-SK5
Price: 40.00 USD
Availability: InStock

What is Selank?

Selank extends the four-residue tuftsin sequence (Thr-Lys-Pro-Arg) with a stabilizing Pro-Gly-Pro tail, a modification designed to resist rapid enzymatic breakdown and extend its activity relative to native tuftsin. It was developed within a research program studying peptide-based approaches to anxiety and immune modulation.

How it is understood to work

Selank is studied for effects on GABAergic signaling and monoamine neurotransmitter balance, along with reported influences on brain-derived neurotrophic factor (BDNF) expression and cytokine profiles. Its proposed anxiolytic activity is described as distinct from benzodiazepine GABA-A receptor mechanisms, which researchers cite as a possible explanation for its reported lack of sedative effect in study models.

Research status

Selank has been investigated in behavioral neuroscience research on anxiety and stress response, in memory and learning models, and in immunology research given its tuftsin lineage. Much of the primary literature originates from a limited number of research groups and has not been replicated at the scale seen for established anxiolytics, so its pharmacology should be regarded as an active but still-developing area of study.

This listing: HK Peptide Selank

Brand: HK Peptide
Kit: 10 vials × 5 mg (50 mg in total)
Price per vial: $4.00
Price per mg: $0.80
Other strengths: 11mg $80.00
Also sold by: Uther Peptide 10mg $60.00

Lab testing

HK Peptide published a Janoshik #227962 report for this compound. Test: Purity & Content (HPLC). Result: 99.66% purity · 11.86 mg. Tested Sep 15, 2026. The vial tested was a different strength than this listing, so treat it as evidence for the compound and ask for the batch COA for this exact strength. Verification key ZVH6NCXA545V can be checked at janoshik.com.

View the report · How to read it (Testing 101) · Every report for this compound

Bought through escrow: the brand is only paid after you confirm delivery. If the parcel never arrives, or an independent test shows the wrong compound or a significant under-fill, open a claim before releasing payment.

Specifications

Compound: Selank
Also known as: Tuftsin analogue
Class: Synthetic heptapeptide (tuftsin derivative)
Form: Lyophilized (freeze-dried) powder
Per vial: 5mg
Molecular formula: C₃₃H₅₇N₁₁O₉
Molecular weight: 751.9 g/mol
Sequence: Thr-Lys-Pro-Arg-Pro-Gly-Pro
Stated purity: ≥99% (HPLC)
Appearance: White lyophilized powder

Handling & storage

Supplied as a lyophilized powder; store unopened vials at -20C protected from light, and keep reconstituted solution refrigerated, using it within the timeframe set by the study protocol.

Concentration check: adding 2 ml of bacteriostatic water to one 5 mg vial gives 2.5 mg/ml. The Research Lab calculator in your dashboard works this out for any volume.

Questions

How is Selank related to tuftsin?

Selank incorporates the native tuftsin sequence (Thr-Lys-Pro-Arg) but adds a Pro-Gly-Pro tail intended to slow enzymatic degradation, giving it a longer window of activity than tuftsin itself in study models.

Why are 5mg, 10mg, and 11mg pack sizes all listed?

Each contains the same Selank peptide and purity specification; the differing totals reflect different manufacturer fill sizes rather than any difference in the compound itself.

How much Selank is in this kit?

10 vials of 5 mg each, so 50 mg in total. The lab testing section above shows what the brand’s tested vial actually contained.

For laboratory research use only. Not for human or veterinary use. Nothing on this page is medical advice.