Selank is a synthetic heptapeptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, based on tuftsin, a natural immune peptide, with a Pro-Gly-Pro tail added for stability. It was developed at the Institute of Molecular Genetics in Moscow.

What is Selank studied for?

Selank is studied in anxiety and stress research, including its effects on GABA signalling, BDNF expression and immune markers.

What is the difference between Selank and Semax?

Both are Russian-developed heptapeptides. Semax is built on a fragment of ACTH and is mainly studied for cognition and neuroprotection. Selank is built on tuftsin and is mainly studied for anxiety and stress.

How is Selank tested?

Every batch goes to an independent lab. The current batch was tested across three vials for purity (RP-HPLC), identity (LC-MS), net peptide content, endotoxins, heavy metals and sterility. Each batch's certificate of analysis is published on the lab results page.

How should Selank be stored?

Keep the sealed vial in the refrigerator at 36–46°F (2–8°C), dry and away from light. As a freeze-dried powder it tolerates room temperature for weeks, which is why it ships without ice. Once reconstituted, keep it refrigerated between uses. More in our guide, Do peptides need to be refrigerated?

How much Selank is in a vial?

Selank comes as a white lyophilized powder in a 10mg vial.

Is Selank for human use?

No. Selank is sold for laboratory research use only.

10mg · 99%+ Purity

SELANK

Selank is a synthetic heptapeptide derived from the endogenous immunopeptide tuftsin, developed at the Institute of Molecular Genetics in Russia.

$45.00

COA Tested 99%+ Purity Research Grade

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99.749% purity View COA

Certificate of Analysis

Selank 10mg · 3 vials tested by an independent lab · RP-HPLC / LC-MS

Batch 2026-SL286

Latest

99.749%

Average purity

Labeled content: 10mg
Net content: 10.54mg (+5%)
Vials tested: 3
Endotoxins: Pass
Heavy metals: Pass
Microbial sterility: Pass
Method: RP-HPLC / LC-MS
Tested: Jul 16, 2026

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Batch SL154

99.17%

Average purity

Labeled content: 10mg
Net content: 11.65mg (+17%)
Vials tested: 1
Endotoxins: Not Tested
Method: HPLC
Tested: Feb 13, 2026

View full COA

Compound Information

Chemical and structural properties

What it is

What is Selank?

Selank is a synthetic heptapeptide derived from the endogenous immunopeptide tuftsin, developed at the Institute of Molecular Genetics in Russia.

Class: Synthetic tuftsin analogue (heptapeptide)
Also known as: Thr-Lys-Pro-Arg-Pro-Gly-Pro
Form: White lyophilized powder
Use: Research use only

Molecular profile

Compound Structure

CAS number: 129954-34-3
Molecular formula: C33H57N11O9
Molecular weight: 751.87 g/mol
Amino acids: 7
Sequence: Thr-Lys-Pro-Arg-Pro-Gly-Pro

PubChem · CID 11765600

Storage

Storage & Stability

Store cold
Protect from light
Keep dry

Lyophilized (powder) 2–8°C (36–46°F) Refrigerate · −20°C for long-term storage

Reconstituted 2–8°C (36–46°F) Refrigerate · use within 28 days

Solubility: Soluble in bacteriostatic water

Selank Overview

A Russian-developed heptapeptide studied for anxiety and stress.

Technical overview

Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro) was developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. It is the natural immune peptide tuftsin (Thr-Lys-Pro-Arg) with a Pro-Gly-Pro tail added for stability.

Research applications

Research uses Selank to study anxiety and stress responses, GABA-A receptor modulation, BDNF expression, and immune markers such as interleukin-6.

FAQs

What is Selank?

Selank is a synthetic heptapeptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, based on tuftsin, a natural immune peptide, with a Pro-Gly-Pro tail added for stability. It was developed at the Institute of Molecular Genetics in Moscow.
What is Selank studied for?

Selank is studied in anxiety and stress research, including its effects on GABA signalling, BDNF expression and immune markers.
What is the difference between Selank and Semax?

Both are Russian-developed heptapeptides. Semax is built on a fragment of ACTH and is mainly studied for cognition and neuroprotection. Selank is built on tuftsin and is mainly studied for anxiety and stress.
How is Selank tested?

Every batch goes to an independent lab. The current batch was tested across three vials for purity (RP-HPLC), identity (LC-MS), net peptide content, endotoxins, heavy metals and sterility. Each batch's certificate of analysis is published on the lab results page.
How should Selank be stored?

Keep the sealed vial in the refrigerator at 36–46°F (2–8°C), dry and away from light. As a freeze-dried powder it tolerates room temperature for weeks, which is why it ships without ice. Once reconstituted, keep it refrigerated between uses. More in our guide, Do peptides need to be refrigerated?
How much Selank is in a vial?

Selank comes as a white lyophilized powder in a 10mg vial.
Is Selank for human use?

No. Selank is sold for laboratory research use only.