What is Selank and where does it come from?

Selank is a synthetic peptide developed from tuftsin, a small immune-regulating fragment the body makes naturally. Researchers extended it with a short stabilizing sequence so it survives longer and can act in the brain. It's studied mainly as a tool for anxiety, mood, and neuropeptide research.

What has research shown about Selank?

In rodent models it has reduced anxiety-like behavior without the sedation, memory effects, or dependence associated with benzodiazepines. Other animal work points to changes in BDNF, serotonin metabolism, and GABA activity. All findings are preclinical and hedged — they describe what studies observed, not guaranteed effects in people.

Is Selank FDA approved?

No. Selank is not approved by the FDA for any use. It has seen use as an investigational compound in Russia, but it holds no approval in the United States. The material sold here is for in-vitro and laboratory research use only — not for human or veterinary use.

How does Selank differ from Semax?

Both are Russian-developed peptides studied for brain effects, but they come from different origins: Selank is based on tuftsin and is studied mostly for anxiety and calming effects, while Semax derives from ACTH and is studied more for cognition and neuroprotection. Researchers often compare the two when investigating regulatory peptides.

What is the molecular structure of Selank?

Selank has the molecular formula C33H57N11O9 and a molecular weight of 751.88 g/mol (CAS 129954-34-3). It's a heptapeptide — a chain of seven amino acids — built on the tuftsin sequence with an added stabilizing tail.

Selank

Calm without sedation — a peptide studied in anxiety models

99.60% pure on this exact lot, verified by an independent lab, not by us
Tested in America. Ships within 1 business day, stored frozen, stable at room temperature until you mix it
Retest it at any lab. If it doesn't match our report, every dollar back

$59/ 10mg vial

$29.50 per vial with Buy 1, Get 1 Free

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In stock

99.60% pure on this exact lot, verified by an independent lab, not by us
Tested in America. Ships within 1 business day, stored frozen, stable at room temperature until you mix it
Retest it at any lab. If it doesn't match our report, every dollar back

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Certificate of analysis

Every vial ships with its own report

We don't publish a brand-wide spec sheet and call it a “COA.” The certificate you receive references the actual lot number stamped on your vial — with the raw chromatograms attached.

Lot-specific HPLC purity + LC-MS identity
Raw chromatogram + mass confirmation attached
Signed off by the lab's Principal Chemist
Permanent archive — searchable by lot ID

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Selank · 10mgLot S91YKXLive

Purity by HPLC-UV

99.60%

Tested by: Accurate Lab Tests
Tested on: 29 Jul 2026
Net content: 13.52 mg

Contaminant screens

Heavy metalsEndotoxinsMicrobialSolvents

See all lab reports

Live batch data

Accurate Lab Tests

Independent analytical lab

Certificate of Analysis

RESULT · PASS

Lot S91YKXVerified

Selank 10mg

HPLC purity

99.60%

Pass · Meets spec

Tested

29 Jul 2026

HPLC-UV + LC-MS

Analytical results

Identity (LC-MS)ConfirmedPASS

Net content13.52 mgPASS

HPLC Chromatogram

Main peak 99.60% · other 0.40%

Alex JohnsonPrincipal Chemist

Authentichain · Verified 55×

GABA / serotoninneurotransmitter tone

BDNFneurotrophic signal

Enkephalinspeptidase activity

How Selank works

Researchers study Selank as acting through three broad routes in the brain and body.

GABA / serotoninneurotransmitter tone

Animal studies suggest Selank shifts activity in calming GABA and mood-linked serotonin systems, which may underlie its anxiety-related effects.

BDNFneurotrophic signal

Preclinical work points to changes in BDNF, a growth factor tied to how brain cells adapt under stress.

Enkephalinspeptidase activity

Selank is studied for slowing the breakdown of enkephalins, the body's own regulatory peptides involved in stress and immune signalling.

For research use only. Mechanisms described reflect published preclinical and clinical literature.

Every batch we've tested

Anyone can show you one good report. Here is every batch of Selank we have ever released, newest first, each with its own signed report. Nothing hidden, nothing cherry-picked.

2 batches on record · latest tested 29 Jul 2026

All lab reportsEvery Selank batch, on one page.The full testing history with every signed report. No login, no email wall.See all lab reports

What the studies found

Published findings on this compound, each linked to its source. Animal and lab results are context, not claims about this product.

AnxietyClinical

17 of 30

In a randomized trial of 60 adults with anxiety, selank worked more slowly than phenazepam, but a week after treatment ended, 17 of 30 on selank were responders versus 9 of 30.

vs 9 of 30 on phenazepam

Zh Nevrol Psikhiatr 2014 · open RCT, n=60

Phenazepam9 of 30

Selank17 of 30

Responders 7 days after the 14-day course ended

AttentionClinical

−16%

In a randomized study of 70 adults with anxiety, adding selank to phenazepam limited the drop in attention-test speed to 16%, versus 35% on phenazepam alone.

vs −35% on phenazepam alone

Phenazepam alone−35%

Phenazepam + selank−16%

Drop in Stroop attention-test speed at day 14

Zh Nevrol Psikhiatr 2015 · open RCT, n=70

WithdrawalPreclinical

−39.6%

In morphine-dependent rats, a single selank injection cut the overall withdrawal score by 39.6%, close to diazepam's 49.3% drop.

vs untreated dependent rats

Selank−39.6%

Diazepam−49.3%

Drop in morphine withdrawal score vs untreated rats