Selank
Selank (Tuftsin Analogue Heptapeptide)
Selank is a synthetic analogue of the endogenous immunomodulatory tetrapeptide tuftsin (Thr-Lys-Pro-Arg) with the addition of Pro-Gly-Pro. It has been studied extensively in Russia for anxiety, cognitive performance, and stress resilience. It acts as an anxiolytic without the sedation, tolerance, or dependence risks associated with benzodiazepines.
Mechanism of Action
Selank modulates GABA-A receptor function via an allosteric mechanism distinct from benzodiazepines, producing anxiolytic effects without sedation or tolerance development. It also enhances GABA receptor sensitivity without directly binding the benzodiazepine site.
Selank increases brain BDNF and enkephalin levels, contributing to improved mood, emotional resilience, and stress tolerance. The enkephalin-stabilising effect (Selank inhibits enkephalin-degrading enzymes) produces endorphin-like emotional smoothing without opioid receptor activity.
Like Semax, Selank is delivered intranasally and reaches the CNS via olfactory transport. Its combination of anxiolytic + mild cognitive-enhancing effects makes it useful for managing performance anxiety without cognitive blunting.
Research Evidence
Selank is approved in Russia for anxiety disorders and cognitive enhancement. Clinical studies demonstrate anxiolytic efficacy without dependence in generalised anxiety disorder. Western research is emerging.
Selank Anxiolytic Effects Without Benzodiazepine Side Effects
In rodent anxiety models (elevated plus-maze, open field, Vogel conflict), Selank produced dose-dependent anxiolytic responses comparable to diazepam without sedation, motor impairment, or tolerance after 21-day continuous administration.
Typical Research Protocol
Na-Selank (N-Acetyl Selank) is a more stable, potent form. Selank can be used daily for short cycles or acutely before stressful events. No withdrawal phenomena reported even after extended use in studies.
Safety Profile
Reported Side Effects
- Mild nasal irritation
- Slight drowsiness (rare, dose-dependent)
- Mood changes (initial adjustment)
Contraindications
- Severe psychiatric disorders requiring medication management
- Pregnancy (insufficient data)
- Known peptide hypersensitivity
Common Research Stacks
Frequently Asked Questions
Can Selank be used daily long-term?
Unlike benzodiazepines, Selank does not produce receptor downregulation or tolerance in studies up to 30 days of continuous use. Most researchers nonetheless recommend cycling (2–4 weeks on, 1–2 weeks off) as a precautionary approach for long-term protocols.
Is Selank better than benzodiazepines for anxiety?
Selank has a markedly better safety profile than benzodiazepines — no sedation, no tolerance, no dependence, no withdrawal syndrome, and no motor impairment in studies. Efficacy for severe generalised anxiety is likely lower than full-dose benzodiazepines. It is best positioned as a mild-to-moderate anxiolytic for performance anxiety, daily stress management, or reducing Semax-associated overstimulation.
How quickly does Selank take effect?
Intranasal Selank typically produces noticeable anxiolytic effects within 15–30 minutes of administration. CNS delivery via olfactory transport is rapid. The acute anxiolytic window lasts 4–6 hours. Cumulative benefits to stress resilience and emotional stability tend to build over 1–2 weeks of consistent use.
What is the difference between Selank and NA-Selank?
NA-Selank (N-Acetyl Selank) is an acetylated form with improved nasal mucosa stability and greater CNS penetration. It is typically 3–5× more potent by dose, requiring 100–200 mcg versus 250–500 mcg for standard Selank. Both produce the same anxiolytic-cognitive profile; NA-Selank Amidate is the most potent form available in research supply.
Can Selank be combined with adaptogens or nootropics?
Selank combines well with various adaptogens and nootropics. Common combinations include Ashwagandha (synergistic GABA support), Lion's Mane (complementary BDNF effects), and Semax (the classic anxiolytic-cognitive combination). No significant adverse interactions are documented with standard nootropic compounds. Avoid combining with GABA-B agonists (baclofen, phenibut) due to additive CNS depression risk.
Key Research References
- Semenova TP et al. (2010). Selank anxiolytic effects: comparative study with diazepam. Bull Exp Biol Med.
- Zozulya AA et al. (2001). Immunomodulatory properties of Selank. Immunopharmacology.
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