Selank: Anti-Anxiety Peptide — Effects, Research, and Dosage
Medically reviewed by Medical Advisory Board Last reviewed 2026-05-13
The Russian anxiolytic peptide that modulates GABA without dependence risk
Selank is a synthetic heptapeptide developed from the naturally occurring tetrapeptide tuftsin, used clinically in Russia for anxiety, stress, and cognitive support. It modulates GABAergic activity and reduces anxiety without the tolerance or dependence risk of benzodiazepines.
Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro) is a synthetic analog of the naturally occurring immune peptide tuftsin, developed at the Institute of Molecular Genetics of the Russian Academy of Sciences (the same group that developed semax). It received regulatory approval in Russia in the 2000s as a treatment for anxiety disorders.
Selank is distinctive in the anxiolytic peptide space for modulating GABA (the brain's primary inhibitory neurotransmitter) through a different mechanism than benzodiazepines — without the tolerance development, dependence potential, and cognitive impairment that make benzos problematic for long-term use. It also shows immunomodulatory properties through its tuftsin-like activity.
Selank Effects and Mechanisms
- GABAergic modulation: Selank enhances GABAergic tone, producing anxiolytic effects comparable to benzodiazepines in animal models — without causing tolerance or dependence.
- Serotonin metabolism: Modulates serotonin turnover in limbic structures, contributing to mood stabilization.
- BDNF effects: Like semax, selank shows some BDNF upregulation, supporting neuroprotection alongside anxiolytic effects.
- Enkephalin degradation inhibition: Inhibits the enzymes that break down enkephalins (endogenous opioid peptides involved in pain and mood), which may contribute to mood-stabilizing effects.
- Immune modulation: Through its tuftsin-like activity, selank modulates cytokine production and immune cell function.
- Cognitive preservation: Unlike benzodiazepines, which impair memory consolidation, selank appears to preserve or slightly enhance cognitive function alongside anxiolytic effects.
Selank vs Semax: Key Differences
| Factor | Selank | Semax |
|---|---|---|
| Primary effect | Anxiolytic, stress reduction | Cognitive enhancement, focus |
| GABA modulation | Strong | Minimal |
| BDNF upregulation | Moderate | Strong |
| Stimulating quality | Calming | Stimulating |
| Best for | Anxiety, stress, sleep, calm focus | Acute focus, BDNF, neuroprotection |
| Stacking | Often combined with semax for balanced cognitive support | Often combined with selank |
Many users stack selank and semax together for balanced cognitive support — selank provides anxiolytic calm while semax provides stimulating cognitive enhancement and BDNF upregulation.
Selank Dosage
Standard selank protocols:
- Intranasal: 250–750 mcg per day (most common route; available as 0.15% solution)
- Injectable: 250–500 mcg subcutaneously per day
- Timing: Morning use common for daytime anxiety/stress management; some use pre-sleep for sleep quality
- Cycle: 2–4 weeks on, 1–2 weeks off
Frequently Asked Questions
What is selank?
Selank is a synthetic heptapeptide derived from tuftsin (a natural immune peptide), developed in Russia in the 1980s and approved there for clinical use as an anxiolytic. It reduces anxiety by modulating GABAergic activity without the tolerance, dependence, or cognitive impairment associated with benzodiazepines.
What does selank do?
Selank reduces anxiety and stress through GABAergic modulation, stabilizes mood by influencing serotonin turnover, provides mild neuroprotection through BDNF upregulation, and modulates immune function through tuftsin-like activity. Unlike benzodiazepines, it doesn't impair memory or cause dependence.
How much selank should I take?
Standard selank dosage in research protocols: 250–750 mcg intranasally per day, or 250–500 mcg subcutaneously. Most users start at the lower end and titrate based on response. Typical cycles are 2–4 weeks with breaks to prevent tolerance. This is for research reference only — not medical advice.
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