Selank monograph

Overview

Selank is a synthetic heptapeptide developed from the thymopoietic peptide tuftsin and studied mainly as an anxiolytic and nootropic agent in Russia and related markets. Human evidence is limited and much of the published work is preclinical or small clinical studies, so it should be treated as experimental rather than an established performance drug. It is commonly sold as an intranasal peptide, but there is no FDA-approved indication and no robust bodybuilding-specific clinical evidence.[^1]

Pharmacokinetics & Mechanism

• Class: Synthetic neuropeptide / anxiolytic peptide analogue
• Mechanism of action: Not well established in humans. Published work suggests Selank modulates neuroimmune signaling and may influence GABAergic and monoaminergic neurotransmission, stress-response pathways, and cytokine expression rather than acting as a classic receptor-selective agonist or antagonist. The overall pattern is best described as neuromodulatory/anxiolytic with possible effects on anxiety, cognition, and stress resilience, but the exact human mechanism remains incompletely defined.
• Target(s): Not well established. Reported research suggests effects on GABA-related signaling, serotonin/dopamine balance, and cytokine/immune signaling; no single validated primary receptor target has been established in humans.
• Route(s) of administration: Primarily intranasal in published and community use; research discussions also mention experimental parenteral use in non-US settings. Oral bioavailability is not established and is generally not how it is used.
• Onset: Not well established; intranasal users commonly report effects within minutes to hours, but that timing is anecdotal and not firmly established in controlled human pharmacokinetic studies.
• Half-life: Not well established in humans. Reliable human half-life data are lacking; no authoritative source in this review provided a validated terminal half-life. Any claims of a precise half-life should be treated cautiously.
• Metabolism / clearance: Not well established. As a peptide, it is expected to undergo enzymatic peptide degradation with rapid clearance, but the specific enzymes, metabolites, and human clearance kinetics are not well defined in the accessible literature.