Thr-Lys-Pro-Arg-Pro-Gly-Pro · Tuftsin analogue · Heptapeptide
A synthetic heptapeptide derived from the immunoregulatory peptide tuftsin. Developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. Approved in Russia for generalised anxiety disorder. Notable for producing anxiolytic effects without sedation, dependency, or cognitive impairment, the key limitations of benzodiazepines.
01, Research Summary
Selank has a more substantial human evidence base than most nootropic peptides. Several trials were randomised and placebo-controlled, a meaningful distinction. The primary clinical research was conducted at Russian institutions over four decades, covering generalised anxiety disorder, neurasthenia, and cognitive enhancement.
Comparable to benzodiazepines for anxiety with added cognitive benefits. A randomised trial comparing Selank to medazepam found similar anxiety reduction but Selank additionally produced antiasthenic and psychostimulant effects absent in the benzodiazepine arm.
Sustained anxiolytic effects without dependency markers. Four-week rat studies confirmed persistent anxiety reduction without memory impairment or dependency signals associated with classical benzodiazepines.
Improved memory and spatial navigation. Consistent performance improvements in radial arm maze and Morris water maze studies, attributed to BDNF upregulation and optimised neurotransmitter balance.
Selank's nomination to the FDA Category 2 restricted list was withdrawn as of April 2026, meaning standard compounding pharmacy regulations now apply. This makes it one of the more legally accessible research peptides in the cognitive category.
02, Mechanism of Action
Selank operates across three converging pathways simultaneously, it doesn't fit into any single neuropharmacological class, which explains its unusual profile of combining anxiolytic and cognitive-enhancing effects.
Selank acts as a positive allosteric modulator of GABA-A receptors, it potentiates GABA's inhibitory action without binding at the classical benzodiazepine site. This produces benzodiazepine-like anxiolysis without the amnesia, dependency, and tolerance that result from direct benzodiazepine binding.
Selank increases brain-derived neurotrophic factor, supporting synaptic plasticity, neurogenesis, and the consolidation of memory. This is the primary mechanism for its nootropic effects and the key distinction from conventional anxiolytics that reduce cognitive performance rather than enhancing it.
Selank inhibits enkephalin-degrading enzymes, increasing endogenous opioid peptide activity in the mood and pain circuitry. It also modulates noradrenaline, serotonin, and dopamine turnover, contributing to its antiasthenic and motivational effects beyond pure anxiety reduction.
The two Russian neuropeptides complement each other. Selank is primarily anxiolytic, calm, focused, low anxiety. Semax is primarily activating, stronger BDNF/dopamine drive, more stimulating. They address the anxiety-performance spectrum from opposite ends and are frequently stacked for a combined calm-focus effect.
03, Dosing Context
Selank is most commonly delivered as a nasal spray. Its ~2-minute blood half-life makes intranasal administration preferable, direct absorption through nasal mucosa provides faster CNS access and bypasses rapid systemic enzymatic degradation. Active metabolites have longer duration of action than the parent peptide.
| Route | Dose | Frequency | Notes |
|---|---|---|---|
| Nasal spray | 250–500 mcg | 2–3x daily | Preferred, direct CNS delivery |
| Subcutaneous | 250–500 mcg | 1–2x daily | Alternative, slightly longer onset |
Typical cycle: 10–14 days on, rest period before resuming. Unlike many peptides requiring weeks to build effects, Selank's anxiolytic effects are often reported within the first few administrations. Prolonged continuous use is less studied; cycling is recommended based on standard peptide protocol principles.
04, Community
Selank occupies a specific niche, the compound people reach for when they want anxiety reduction without sedation or cognitive fog. Community reports consistently contrast it favourably with benzodiazepines: reduced anxiety with maintained or improved mental clarity. The "calm focus" description appears repeatedly across r/nootropics threads. The Selank + Semax combination is the most discussed pairing, with users reporting a focused, low-anxiety productivity state that neither compound achieves as effectively alone.