Russian Nootropic • BDNF Modulator

Semax: The Neuroprotective Peptide

📄 1 PubMed citation

By , HighPeptides Editor

Last updated: March 2026

Semax is a synthetic ACTH(4-10) analog developed at Russia's Institute of Molecular Genetics. It upregulates BDNF protein levels by 1.4-fold and is approved in Russia for acute stroke therapy, cognitive disorders, and neuroprotection with over two decades of clinical use.

1.4×
BDNF Protein
Increase
ACTH
Derived from
ACTH(4-10)
0
Amino Acid
Heptapeptide
📋 On this page
  1. What Is Semax?
  2. What the Research Shows
  3. Side Effects & Safety Profile
  4. Study Citations
  5. Who Researches Semax?
  6. Key Takeaways
  7. 🔬 Verified Research Source
  8. Related Resources
Background

What Is Semax?

Semax (Met-Glu-His-Phe-Pro-Gly-Pro) combines the active ACTH(4-7) fragment with a stabilizing Pro-Gly-Pro tripeptide. Unlike full ACTH, it does not significantly stimulate adrenal hormone production — its effects are concentrated on neurotrophin modulation and neuroprotection.

🧬
BDNF & NGF Upregulation

A single dose increases BDNF protein levels 1.4-fold and TrkB phosphorylation 1.6-fold. Also induces 3-fold increase in BDNF mRNA and 2-fold increase in NGF mRNA in rat hippocampus.

🧠
Dopamine & Serotonin

Modulates dopaminergic and serotonergic neurotransmission, enhancing motivation, focus, and mood without stimulant-like side effects.

🩸
Cerebral Blood Flow

Improves cerebral microcirculation — a key mechanism for its approved use in acute ischemic stroke therapy in Russia.

🛡️
Neuroprotection

Activates neurotrophic factor expression after cerebral ischemia, promoting neuronal survival and recovery through BDNF/NGF and TrkB receptor pathways.

Research

What the Research Shows

📋

Context: Semax has been approved and used clinically in Russia since the 1990s. It has a substantial Russian literature base. The BDNF modulation data is well-replicated across multiple labs. Western clinical data remains limited.

BDNF/TrkB Expression — Hippocampus (Dolotov et al., 2006)
1.4× BDNF protein, 1.6× TrkB phosphorylation, 3× BDNF mRNA after single dose
Positive
Acute Ischemic Stroke — Russian Clinical Use
Approved for stroke therapy; improved rehabilitation timing in patients with high BDNF
Positive
Neurotrophin Gene Expression After Ischemia
Activated BDNF, NGF, and TrkB transcription in ischemic rat brain
Positive
Cognitive Enhancement — Clinical Studies
Improved attention, memory, and learning capacity in Russian clinical populations
Positive
Safety

Side Effects & Safety Profile

Nasal Irritation
Mild irritation at intranasal administration site
Mild
Adrenal Stimulation
Minimal — unlike full ACTH, does not significantly affect adrenal hormones
Minimal
Headache
Rare — reported in small number of users
Rare
Sources

Study Citations

BDNF Study
Semax, an analog of ACTH(4–10) with cognitive effects, regulates BDNF and trkB expression in the rat hippocampus
Dolotov OV, et al. · Brain Research, 2006 · PMID: 16996037
Ischemia Study
Semax and Pro-Gly-Pro Activate the Transcription of Neurotrophins and Their Receptor Genes after Cerebral Ischemia
PMC11498467 · 2024
Review
Semax — Cognitive Vitality For Researchers
Alzheimer's Drug Discovery Foundation · Comprehensive safety/efficacy review

Self-Assessment

Who Researches Semax?

This Research Is Commonly Explored By People Who...

  • Are interested in BDNF modulation as a cognitive enhancement strategy
  • Want to understand neuroprotective approaches for stroke and brain injury
  • Are exploring Russian-developed peptide nootropics with clinical approval
  • Want a nootropic that modulates neurotrophins rather than stimulant pathways

This Research May Not Be Relevant If...

  • You want FDA-approved nootropics — Semax is not available in the US
  • You prefer oral administration — Semax requires intranasal delivery
  • You want immediate stimulant-like effects — Semax works through neurotrophin modulation
📚

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Bottom Line

Key Takeaways

✅ What We Know
  • 1.4× BDNF protein increase from single dose
  • Approved in Russia for stroke and cognitive disorders
  • Does not stimulate adrenal hormones like ACTH
  • Well-tolerated with minimal side effects
  • Over 20 years of clinical use in Russia
⚠️ What We Don't Know
  • Not FDA approved — no Western clinical trials
  • Limited long-term safety data outside Russia
  • Intranasal-only (no oral bioavailability)
  • Optimal dosing for healthy cognitive enhancement unclear

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Research Supplies

Tools and supplies relevant to this research area.

🧴 Empty Nasal Spray Bottles 10mL plastic spray bottles for compounding intranasal peptide solutions. 💧 Distilled Water Lab-grade distilled water for dissolving water-soluble peptides. 📏 pH Test Strips Verify final solution pH (target ~5–7 for nasal peptides). ❄️ Mini Fridge for Peptides Keep reconstituted peptides at 2–8°C between doses.

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⚠️ Disclaimer

Semax is NOT FDA approved in the United States. It is approved in Russia for stroke and cognitive disorders. This page is for educational purposes only. Not medical advice. Approved Russia Not Available US