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evidence · mechanism · dose
Experimental/Nootropic / AnxiolyticResearch peptide

Selank

A Russian-developed heptapeptide studied for anxiolytic and cognitive-enhancing effects without sedation.

Educational explainer of a research peptide. Profiles in this section deliberately omit clinical-trial citations, dosing protocols, and purchase links. Not FDA-approved as a supplement; not a recommendation to use.

Overview

Selank is a synthetic analog of tuftsin, a naturally occurring immunomodulatory peptide. It has been studied as a non-sedating anxiolytic.

Source
  • Synthesized in research laboratories
Forms
  • Intranasal spray
  • Subcutaneous injection

Mechanism of action

Modulates GABA, serotonin, and BDNF systems while increasing enkephalin stability, producing calming and pro-cognitive effects.

Pathways
  • · GABAergic tone
  • · BDNF expression
  • · Enkephalin stabilization
Neurotransmitters
  • · GABA
  • · Serotonin
  • · Enkephalins

How it acts on the body

Selank's anxiolytic effect comes from a different mechanism than benzodiazepines. Instead of binding GABA-A directly, it appears to inhibit the enzyme that breaks down enkephalins (an endogenous opioid-like neuropeptide system), and it modestly upregulates GABA tone indirectly. Because there is no direct receptor agonism, it does not produce dependence or sedation.

On the cognitive side, Selank raises BDNF expression in hippocampal regions and shifts the serotonergic balance toward serotonin reuptake and turnover. That combination — calmer amygdala signaling plus increased BDNF — is thought to underlie reports of feeling 'clear and unrushed' rather than sedated or numbed.

Hormonal & endocrine impact

How this peptide is reported to shift specific hormones and signaling molecules. Directionality reflects research literature and preclinical models, not clinical prescribing data.

Projected hormonal trajectory
Illustrative curves derived from reported direction of effect. Not measured patient data.

Curves are schematic shapes (sigmoid for increases/decreases, damped oscillation for modulation/stabilization) anchored to a 100% baseline. They communicate direction and tempo of change reported in research literature — not absolute hormone concentrations.

GABA toneIncreases
Indirectly enhanced via enkephalin system modulation.
EnkephalinsStabilizes
Slows enzymatic degradation of endogenous opioid peptides.
BDNFIncreases
Elevated hippocampal BDNF supports memory and stress resilience.
Cortisol responseDecreases
Blunts cortisol spikes during acute stress in animal models.
SerotoninModulates
Rebalances 5-HT turnover; does not act like an SSRI.

Effects on the body

Decreases
Anxiety and stress reactivity
Supports
Working memory and focus
Optimizes
Mood without sedation

Organ system effects

Brain & CNS

Anxiolytic and pro-cognitive effects in clinical studies conducted in Russia.

Immune System

Mild immunomodulatory activity reported.

Reported effects

Drawn from preclinical research, anecdote, and small-scale clinical observation. No evidence grades are assigned — most peptides on this page lack rigorous human trials.

  • Calming without drowsiness
  • Improved focus during high-stress tasks
  • Reported antidepressant-adjacent effects in trials

Potential side effects

Common
  • · Mild nasal irritation (spray form)
Rare
  • · Headache
  • · Fatigue
Serious
  • · Limited long-term human data outside of Russian literature

Drug interactions

Benzodiazepines
Theoretical additive anxiolytic effect.
minor
Opioid analgesics
May potentiate enkephalin activity.
moderate

Pairing context

Often combined with
  • Semax
    Commonly paired for combined focus and calm.
Avoid combining with
  • Pregnancy
    No safety data; avoid.
Important. Research peptides described here are not FDA-approved supplements. Supplement Scholar does not endorse, recommend, or link to any source for purchase. Consult a qualified clinician before considering any peptide therapy.