GABAergic Modulation & Anxiolytic Neuropeptide
Selank — Synthetic Tuftsin Analog Anxiolytic
Selank is a synthetic heptapeptide developed at the Institute of Molecular Genetics of the Russian Academy of Sciences, based on the immunomodulatory tetrapeptide tuftsin (Thr-Lys-Pro-Arg) with a C-terminal Pro-Gly-Pro extension that dramatically enhances metabolic stability. Selank has been approved in Russia and Ukraine as an anxiolytic and nootropic agent, with clinical use for generalized anxiety disorder, neurasthenia, and cognitive impairment.
Unlike benzodiazepines, which act as positive allosteric modulators of GABA-A receptors and carry significant risks of dependence, tolerance, and cognitive impairment, selank is reported to exert anxiolytic effects through a more nuanced modulation of GABAergic, serotonergic, and dopaminergic systems without the sedative or dependence-producing properties of classical anxiolytics.
Selank has the amino acid sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, with a molecular weight of 751.86 Daltons. The C-terminal Pro-Gly-Pro extension is critical for metabolic stability: it protects the peptide from rapid enzymatic degradation, extending its effective half-life compared to the parent tuftsin tetrapeptide.
The peptide is structurally related to tuftsin, a naturally occurring immunomodulatory peptide derived from IgG, but has been engineered specifically for central nervous system activity and enhanced stability.
Selank's mechanism of action involves multiple neurotransmitter systems. The primary anxiolytic mechanism appears to involve modulation of the GABAergic system: selank has been shown to increase the expression of GABA-A receptor subunits and enhance GABAergic transmission without directly binding to the benzodiazepine site, potentially explaining its anxiolytic effects without the sedation and dependence associated with benzodiazepines.
Selank also modulates the serotonergic system, increasing 5-HT turnover in the hippocampus and frontal cortex, and the dopaminergic system, with effects on dopamine metabolism in limbic structures. Additionally, selank upregulates brain-derived neurotrophic factor (BDNF) expression, which may contribute to its reported nootropic and neuroprotective effects.
The immunomodulatory component — inherited from its tuftsin parent — involves modulation of T-cell function and cytokine expression, including IL-6 and IFN-γ.
Selank is a synthetic heptapeptide (seven amino acids) developed by the Institute of Molecular Genetics of the Russian Academy of Sciences. It's based on a fragment of the immune protein tuftsin, with additional modifications to improve stability. In Russia, it's been approved as an anxiolytic (anti-anxiety) drug and is used clinically for anxiety and cognitive enhancement. In the West, it's classified as a research compound.
Selank's primary studied mechanism is modulation of the GABAergic system — the same neurotransmitter system targeted by benzodiazepines (Valium, Xanax), but through a different mechanism that doesn't appear to cause dependence or sedation. It also influences BDNF (Brain-Derived Neurotrophic Factor) expression, which supports neuronal survival and plasticity. Russian clinical studies have reported anxiolytic effects comparable to benzodiazepines without the sedation or withdrawal issues.
Anxiety disorders are among the most prevalent mental health conditions globally, and current first-line treatments (SSRIs, benzodiazepines) have significant limitations including side effects, dependence risk, and delayed onset. A compound that modulates the GABAergic system without causing sedation or dependence would represent a meaningful advance. Selank's clinical use in Russia provides a real-world dataset that Western researchers can build on.
Selank is one of the most clinically used cognitive/anxiolytic peptides in this catalog, with approved clinical status in Russia. Its non-sedating, non-habit-forming profile makes it an interesting research subject for anxiety and cognitive biology. The majority of its evidence base is in the Russian literature, and independent Western replication is limited. Research-only compound.
Upregulates GABA-A receptor subunit expression and enhances GABAergic transmission without direct benzodiazepine site binding.
Increases brain-derived neurotrophic factor expression in hippocampus and frontal cortex, supporting neuroplasticity and neuroprotection.
Modulates 5-HT turnover and dopamine metabolism in limbic structures, contributing to anxiolytic and mood-stabilizing effects.
Modulates T-cell function and cytokine expression (IL-6, IFN-γ) via tuftsin-inherited immunomodulatory activity.
1 cited study — model, sample size, outcome, and effect size from published literature.
| Study | Model | Sample | Outcome | Effect Size | Level |
|---|---|---|---|---|---|
Semenova TP, et al. (2010) Selank and tuftsin modulate the expression of genes related to the serotoninergi… PubMed | Rodent (rat) — anxiety model | n=30 | Anxiolytic effect without sedation; serotonin metabolism modulation | Anxiety reduction comparable to diazepam without sedation | Animal |
Cognitive Research
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| Peptide Class | Synthetic heptapeptide (tuftsin analog) |
| Molecular Weight | 751.86 Da |
| Regulatory Status | Approved anxiolytic/nootropic in Russia and Ukraine |
| Parent Peptide | Tuftsin (Thr-Lys-Pro-Arg) + Pro-Gly-Pro extension |
| Available Sizes | 5mg vials |
| Form | Lyophilized powder |
| Purity | ≥99% (third-party tested) |
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Purchase Selank at Purgo LabsMedical Disclaimer: All content on this site is for educational and research purposes only. Research peptides are not FDA-approved for human use. Always consult a qualified healthcare professional before considering any peptide or supplement protocol. Nothing on this site constitutes medical advice, diagnosis, or treatment.
