Sleep & Stress injectableintranasal

Selank

By Hack SmithLast updated: How we research

Calms anxiety and lifts mood naturally

Common Uses
  • Anxiety
  • Stress Relief
  • Depression
Evidence Grade
C — Limited — Animal study data
Russian human clinical data (anxiety); limited Western RCTs.
Safety Notes

No evidence of tolerance or dependence development—a notable safety advantage over benzodiazepine anxiolytics May lower blood pressure; use caution in hypotensive individuals Potential anticoagulant effects; caution advised with concurrent blood-thinning medications

Mechanism of Action

Selank is a synthetic heptapeptide derived from the immunomodulatory peptide tuftsin. It acts primarily by inhibiting enkephalin-degrading enzymes (enkephalinases), particularly carboxypeptidases and dicarboxypeptidases, in blood plasma. This inhibition increases the half-life and availability of endogenous enkephalins, which are opioid peptides involved in mood regulation and stress response. Key Pathways: Enkephalinase inhibition (carboxypeptidases and dicarboxypeptidases), Endogenous opioid (enkephalin) system modulation, Stress-adaptive behavioral regulation By preserving enkephalins from rapid degradation, Selank may enhance the natural anxiolytic and mood-stabilizing effects of the endogenous opioid system. This mechanism correlates with observed reductions in anxiety-like behaviors in animal models, particularly in stress-sensitive phenotypes, and suggests potential benefits for stress adaptation and emotional regulation.

Common Dose Reference Ranges

Educational reference ranges only — discuss actual dosing with a qualified healthcare provider.

Low
200
mcg
Standard
300
mcg
High
400
mcg
📖 Used in these guides
😴 Sleep Guide
📖 Related guides
Best Peptides for Sleep: A Ranked Guide
🔬 Related compounds
DSIP (Delta-Sleep-Inducing Peptide)Ipamorelin
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Full Selank protocols — frequency, timing, cycle length, reconstitution & research

Frequency: 5 on/2 off or every other day
Half-life: ~2-3 minutes (plasma), with prolonged biological effects lasting hours
Cycle length: 4 weeks
Side Effects
  • Fatigue or mild sedation
  • Nasal irritation (intranasal administration)
  • Headache
  • Hypotension (decreased blood pressure)
  • Increased cerebral blood flow
  • Anticoagulant effects
Compatible Stacks
SemaxPiracetamMagnesiumL-Theanine
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