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evidence · mechanism · dose
Experimental/NootropicResearch peptide

Semax

A Russian-developed heptapeptide derived from ACTH studied for focus, neuroprotection, and stroke recovery.

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

Semax is a synthetic analog of an ACTH(4-10) fragment with the natural hormonal effects removed, used in Russia as a nootropic and neuroprotective agent.

Source
  • Synthesized in research laboratories
Forms
  • Intranasal spray

Mechanism of action

Upregulates BDNF and NGF expression, modulates dopamine and serotonin systems, and inhibits enkephalin breakdown.

Pathways
  • · BDNF / NGF upregulation
  • · Dopamine modulation
  • · Enkephalin stabilization
Neurotransmitters
  • · Dopamine
  • · Serotonin
  • · Enkephalins

How it acts on the body

Semax is derived from the part of the ACTH molecule that has neurotrophic effects, with the steroid-stimulating portion deliberately removed. So it activates many of the cognitive and neuroprotective benefits associated with ACTH-related peptides without raising cortisol or driving adrenal output.

Its strongest signal is upregulation of BDNF and nerve growth factor (NGF) in the hippocampus, frontal cortex, and basal forebrain — regions involved in attention, memory, and motivation. It also blocks the enzymatic breakdown of enkephalins, which subtly raises pain tolerance and stabilizes mood under stress. Clinical literature in Russia supports its use in ischemic stroke, where the BDNF upregulation appears to support neuron survival.

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.

CortisolStabilizes
Steroidogenic portion of ACTH is absent — no HPA-axis activation.
BDNFIncreases
Hippocampal and frontal-cortex BDNF rises after intranasal dosing.
NGFIncreases
Supports cholinergic neuron survival in animal models.
DopamineModulates
Mild facilitation of dopaminergic tone — improves motivation without classic stimulant rebound.
EnkephalinsStabilizes
Inhibits breakdown of endogenous opioids, modestly raising pain tolerance and stress resilience.

Effects on the body

Increases
BDNF expression
Supports
Focus, motivation, and recall
Optimizes
Resilience to mental fatigue

Organ system effects

Brain & CNS

Neuroprotective in clinical studies of ischemic stroke; supports cognitive performance under load.

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.

  • Sharper focus and motivation
  • May aid memory consolidation
  • Used clinically in Russia for stroke recovery

Potential side effects

Common
  • · Mild nasal irritation
Rare
  • · Headache
  • · Insomnia if dosed late
Serious
  • · Limited long-term safety data outside Russian literature

Drug interactions

Stimulants
Additive activating effect possible.
minor
MAOIs
Theoretical dopaminergic interaction.
moderate

Pairing context

Often combined with
  • Selank
    Common pairing for focus with calm.
Avoid combining with
  • Severe insomnia
    May worsen sleep onset if dosed late.
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.