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Semax

Also known as: ACTH(4-10) analog, Met-Glu-His-Phe-Pro-Gly-Pro, Heptapeptide Semax

Semax is a synthetic analog of the adrenocorticotropic hormone (ACTH) fragment 4-10, with an added Pro-Gly-Pro tripeptide at the C-terminus for enhanced stability and bioavailability. Originally developed in Russia for treating stroke and cognitive disorders, Semax has demonstrated remarkable neuroprotective effects through multiple mechanisms including activation of neurotrophic factor expression (BDNF, NGF, NT-3), immunomodulation, and enhancement of cerebral circulation. Semax shows strong promise in cognitive enhancement and treatment of ADHD.

Research Score7/10

Growing body of research

Safety Score8/10

Well-tolerated with minimal side effects

How It Works

Semax activates melanocortin receptors and modulates the expression of neurotrophic factors including BDNF, NGF, and NT-3 through genomic-level transcriptional changes. It enhances cerebral circulation via immunomodulatory pathways, shifts cytokine balance toward anti-inflammatory states, and promotes neuronal survival through transthyretin-mediated neuroprotection.

Key Benefits

  • Provides neuroprotection during ischemic events
  • Enhances BDNF and neurotrophic factor expression
  • Supports cognitive function, memory, and focus
  • Modulates immune response in the central nervous system
  • Promotes cerebral blood flow and vascular health
  • May reduce neuroinflammation and oxidative stress

Who May Benefit

  • Adults experiencing cognitive decline or brain fog
  • Individuals recovering from neurological events
  • People seeking enhanced memory, focus, and mental clarity
  • Those interested in long-term neuroprotection and brain health

Dosage & Administration

Typical Dosage
One to three times daily
Cycle Length
10-20 days per cycle, with breaks between cycles
Administration Routes
nasalsubcutaneous

Expected Timeline

Improved focus and mental clarity often noticed within days. Neurotrophic and neuroprotective benefits build over 2-4 weeks of consistent use. Optimal results with cycling protocols.

Safety Information

Possible Side Effects

Nasal irritation (intranasal use)Headache (rare)Dizziness (infrequent)Mild fatigue initially

Contraindications

Pregnancy or breastfeedingActive endocrine disorders without physician guidanceHypersensitivity to ACTH-related peptides
Dr. Patrick Taylor, MD

Dr. Taylor's 2 Cents

“What sets Semax apart from other cognitive enhancers is that it works at the genetic level — upregulating BDNF and other neurotrophic factors that actually support brain health long-term, not just mask symptoms. The neuroprotective data from stroke research is impressive, and I find it pairs beautifully with Selank for patients looking for both cognitive enhancement and anxiety reduction. The intranasal delivery makes it very convenient for daily use.”

Discuss with Dr. Taylor →

Frequently Asked Questions

What is Semax and how does it work?
Semax is a synthetic peptide derived from ACTH(4-10) that enhances brain function by upregulating neurotrophic factors like BDNF, supporting neuronal health, and modulating immune responses in the central nervous system.
How is Semax different from other nootropics?
Unlike stimulant-based nootropics, Semax works at the genetic level to increase production of brain-protective proteins. It doesn't just boost alertness — it supports actual neuronal growth and survival.
How is Semax administered?
Most commonly used as an intranasal spray at 200-600 mcg per dose, 1-3 times daily. This provides rapid absorption and direct access to the central nervous system.
How long does it take to see results?
Many people notice improved focus and clarity within the first few days. The deeper neuroprotective benefits develop over 2-4 weeks of consistent use.
Is Semax safe?
Semax has an excellent safety profile with decades of clinical use in Russia. Side effects are minimal — mainly mild nasal irritation with intranasal use. It has no known addictive properties.
Can Semax be combined with Selank?
Yes, Semax and Selank are frequently used together. Semax provides cognitive enhancement while Selank addresses anxiety — together they offer comprehensive brain support without sedation.

Published Research

1

Semax and Pro-Gly-Pro activate the transcription of neurotrophins and their receptor genes after cerebral ischemia

Dmitrieva VG, Povarova OV, Skvortsova VI, et al. · Cell and Molecular Neurobiology (2010)

Key Finding: Semax selectively activated transcription of BDNF, TrkC, and TrkA neurotrophins in ischemic rat brain cortex, demonstrating targeted neuroprotective gene activation.

PubMed →
2

The peptide semax affects the expression of genes related to the immune and vascular systems in rat brain focal ischemia: genome-wide transcriptional analysis

Medvedeva EV, Dmitrieva VG, Povarova OV, et al. · BMC Genomics (2014)

Key Finding: Genome-wide analysis revealed Semax predominantly enhanced immune-related gene expression and modified vascular development genes during brain ischemia, explaining its broad neuroprotective effects.

PubMed →
3

Investigation of mechanisms of neuro-protective effect of semax in acute period of ischemic stroke

Miasoedova NF, Skvortsova VI, Nasonov EL, et al. · Zhurnal Nevrologii i Psikhiatrii imeni S.S. Korsakova (1999)

Key Finding: Semax demonstrated angioprotective and antihypoxic properties during acute ischemic stroke, shifting immune balance toward anti-inflammatory cytokines while suppressing pro-inflammatory markers.

PubMed →

Protocols Featuring Semax

Cognitive Clarity Protocol
Mental sharpness and mood support

Related Peptides

Selank
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Epithalon
Anti-Aging
MOTS-c
Weight Management

Want personalized guidance?

Consult with Dr. Patrick Taylor for a comprehensive evaluation and personalized protocol.

Book a Consultation

Medical Disclaimer: This information is for educational purposes only and is not medical advice. Consult a healthcare provider before starting any peptide protocol.