Cognitive · Anxiolytic heptapeptide · Compounded 503A
Selank: calm, focused cognition without sedation.
Selank is a synthetic analog of the human immunopeptide tuftsin, developed at the Russian Institute of Molecular Genetics. It has been used clinically in Russia for generalized anxiety since 2009. Its appeal is unusual: anxiolytic activity without the sedation, dependence, or cognitive blunting of benzodiazepines.
What Selank is
Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro) is a seven-amino-acid peptide derived from tuftsin, an endogenous human immunomodulatory peptide. The C-terminal Pro-Gly-Pro fragment was added to extend half-life — native tuftsin is broken down within minutes.
It was registered as a prescription anxiolytic in Russia in 2009 for generalized anxiety disorder and asthenia. Outside Russia it is investigational and available through compounding pharmacies for off-label use.
Patients describe the subjective effect as 'the volume of background anxiety turned down' rather than sedation — making it usable during work or driving.
How it works
Selank's anxiolytic effect appears to be mediated by modulation of GABAergic tone — not by direct binding to the benzodiazepine site, but by upregulating GABA-A receptor expression and shifting the balance of inhibitory and excitatory signaling.
It also raises hippocampal BDNF (brain-derived neurotrophic factor), the same growth factor implicated in long-term effects of SSRIs and exercise. This BDNF effect is the likely mechanism behind reported cognitive benefits.
Selank affects enkephalin metabolism (it inhibits enkephalin-degrading enzymes), which contributes to mood and stress regulation through endogenous opioid tone — a mechanism distinct from any other approved anxiolytic.
What patients use it for
Anxiolytic without sedation
Reduces generalized anxiety symptoms while preserving alertness, working memory, and reaction time — the signature distinction from benzodiazepines.
Focus and cognitive clarity
Patients commonly report improved task focus and mental clarity, likely tied to BDNF upregulation and serotonergic modulation.
Sleep quality
By reducing anticipatory anxiety and arousal, Selank often improves sleep onset and continuity without acting as a hypnotic.
Mood stabilization
Modulation of enkephalin tone supports stable mood through stressful periods — a mechanism distinct from SSRIs and benzodiazepines.
Evidence summary
Kozlovskaya MM et al. (Eksperimental'naia i Klinicheskaia Farmakologiia, 2003) demonstrated Selank's anxiolytic and antidepressant activity in animal models, with efficacy comparable to medazepam without sedation or motor impairment.
Zozulia AA et al. (Zhurnal Nevrologii i Psikhiatrii, 2008) reported clinical efficacy of Selank in generalized anxiety disorder in a Russian clinical study — the basis for its 2009 registration.
Most published RCTs are Russian-language and pre-date Western registration trial standards. Western RCT replication is limited. Honest framing: real clinical use base, modest peer-reviewed Western literature.
Dosing and clinical context
General clinical context only. Kindr Health physicians determine the appropriate dose and protocol for each patient based on history and labs. This is not a prescription or dosing recommendation.
Most commonly intranasal — typical regimens are 250–500 mcg per dose, 2–3 times daily.
Course-based use (2–4 weeks on, then reassessment) is more common than indefinite daily use.
Compounded Selank nasal spray from licensed 503A pharmacies is the standard U.S. dispensing pathway.
Safety and contraindications
Generally well-tolerated. The most common reported side effect is mild nasal irritation from the intranasal spray.
No reported dependence, tolerance, or withdrawal — a defining contrast with benzodiazepines.
Contraindications: pregnancy, lactation, known peptide sensitivity. Use under physician supervision through a licensed 503A pharmacy.
Who it's typically considered for
- Adults with generalized anxiety who want non-benzodiazepine, non-sedating support
- Patients who cannot tolerate SSRIs or want a complement to existing therapy
- Perimenopausal patients with anxiety driven by hormonal flux
- Patients seeking cognitive support without stimulant load
Frequently asked questions
Is Selank addictive?
No clinical or preclinical evidence of dependence, tolerance, or withdrawal. This is the central distinction between Selank and benzodiazepines.
Is Selank FDA-approved?
No. Selank is approved in Russia as a prescription anxiolytic but is investigational in the U.S. Compounded Selank is prepared by licensed 503A pharmacies for off-label use.
Will Selank make me drowsy?
No. The defining feature is anxiolytic effect without sedation. Patients report working, driving, and exercising normally on Selank.
Can I take Selank with an SSRI?
Combination use occurs in practice but should always be physician-supervised — interactions with serotonergic medications are not fully characterized in Western literature.
How quickly does Selank work?
Acute anxiolytic effects are often reported within 30–60 minutes of intranasal dosing. Cumulative cognitive and mood effects build over 2–3 weeks of consistent use.
Selank vs Semax — which one?
Selank is the calming peptide of the pair; Semax is the activating one. Selank suits anxiety and overactivation; Semax suits low energy, fog, or attention deficits. They're sometimes used in alternating cycles.
Is Selank good for menopausal anxiety?
Many perimenopausal patients use Selank as a non-hormonal adjunct for anxiety driven by estradiol decline. The non-sedating, non-dependence profile is especially valuable here.
Sources
- Kozlovskaya MM et al. Selank and short peptides of the tuftsin family. Eksperimental'naia i Klinicheskaia Farmakologiia (2003). — pubmed.ncbi.nlm.nih.gov/14593881
- Zozulia AA et al. The efficacy and possible mechanisms of action of a new peptide anxiolytic selank. Zhurnal Nevrologii i Psikhiatrii (2008). — pubmed.ncbi.nlm.nih.gov/18454096
- Volkova A et al. Selank administration affects the expression of some genes involved in GABAergic neurotransmission. Frontiers in Pharmacology (2016). — pubmed.ncbi.nlm.nih.gov/26973528
- Medvedev VE et al. Selank in treatment of asthenic disorders. Zhurnal Nevrologii i Psikhiatrii (2014). — pubmed.ncbi.nlm.nih.gov/25176256
Considering Selank?
A Kindr Health physician reviews every longevity intake — peptides are prescribed only when medically indicated based on your history and labs. There is no charge for the initial review.
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Medically reviewed by Dr. Ana Lisa Carr, MD, MBA
Board-Certified Family Medicine Physician · Lead Provider / Medical Reviewer
NPI 1689841744 · Last reviewed: May 10, 2026
Last reviewed May 10, 2026. Compounded medications are prepared by FDA-registered 503A pharmacies and are not FDA-approved drug products. Prescriptions require a clinical evaluation; a Kindr Health physician determines eligibility. Not for use in pregnancy. This page provides educational information and is not medical advice.