What is the dosing range for Semax?

Semax is typically dosed at 200mcg (low), 600mcg (moderate), or 900mcg (high) mcg, administered Once or twice daily (intranasal most common). These ranges are aggregated from preclinical research and community protocols — not medical dosing guidance.

What are the reported side effects of Semax?

Reported side effects of Semax include: Mild anxiety or restlessness at high doses, Nasal irritation (intranasal route), Increased energy / difficulty sleeping if dosed too late in the day, Mild appetite suppression, Transient blood pressure increase (uncommon).

Nootropic

Semax

Also known as: ACTH(4-7)PGP, Met-Glu-His-Phe-Pro-Gly-Pro

Semax is a research compound not approved for use in the US/EU. It is a registered pharmaceutical in Russia and Ukraine. For informational purposes only.

📚 Content aggregated from:3 peer-reviewed sources·r/Peptides community·PubMed / NCBI

Overview

Semax is a synthetic heptapeptide derived from adrenocorticotropic hormone (ACTH) — specifically the 4–7 fragment modified with a C-terminal Pro-Gly-Pro extension for stability. Developed in Russia in the 1980s and used clinically there for stroke recovery, cognitive enhancement, and neuroprotection, it is one of the most researched nootropic peptides with a decades-long safety record in Eastern European clinical practice. Its primary mechanism involves potent upregulation of BDNF (Brain-Derived Neurotrophic Factor).

Research Summary

Semax increases BDNF expression in the hippocampus and frontal cortex by 1.3–1.6x at research doses in rodent models. It also upregulates NGF (nerve growth factor) and modulates serotonin, dopamine, and NMDA receptor systems. Russian clinical data (not yet replicated in Western trials) suggests efficacy in ischemic stroke recovery, ADHD, glaucoma, and cognitive decline. The Pro-Gly-Pro C-terminal extension dramatically improves resistance to enzymatic degradation compared to native ACTH(4-7).

Dosing Range

low

200mcg

moderate

600mcg

high

900mcg

Units: mcg · Frequency: Once or twice daily (intranasal most common)

Dosing ranges are aggregated from preclinical research and community protocols. Not medical dosing guidance.

Administration Routes

Intranasal (preferred — high CNS bioavailability)Subcutaneous injection

Reconstitution Notes

Reconstitute with sterile saline to 0.1% (1mg/mL). For intranasal use, typically diluted to 0.1–0.3mg/mL and administered via nasal spray. 1–3 drops per nostril. Stable 30 days refrigerated. Protect from light.

Step-by-step reconstitution guide →

Supplies you'll need

Insulin Syringes (U-100)Reconstitution Needles Lambda BAC Water Alcohol Prep Pads

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Reported Side Effects

Mild anxiety or restlessness at high doses
Nasal irritation (intranasal route)
Increased energy / difficulty sleeping if dosed too late in the day
Mild appetite suppression
Transient blood pressure increase (uncommon)

Research Papers

3 peer-reviewed sources

Semax, an ACTH(4-7) analogue with nootropic properties: influence on brain monoamine metabolism

Brain Research1999

Semax increases BDNF and NGF expression after middle cerebral artery occlusion in rats

Neuroscience Letters2012

Semax in the treatment of ischemic stroke: clinical data and mechanisms

CNS Drug Reviews2003

Community Experiences

Aggregated from public forums. Anecdotal — not clinical evidence.

r/nootropics

Extensive community experience with intranasal Semax dosing, stacking with Selank, and cognitive effects.

View original thread

r/Peptides

Research peptide community protocols — Semax for focus, neuroregeneration, and BDNF support.

View original thread

Overview

Semax is one of the few nootropic peptides with genuine clinical use behind it. While most research peptides exist only in animal studies and anecdotal reports, Semax has been prescribed in Russia and Ukraine for decades — primarily for stroke rehabilitation and cognitive support. This clinical history provides a safety signal that most research peptides lack.

Mechanism: BDNF and Neurotrophic Upregulation

The primary driver of Semax's cognitive effects is BDNF (Brain-Derived Neurotrophic Factor) upregulation. BDNF is often called "Miracle-Gro for the brain" — it promotes:

Neuronal survival and growth
Synaptogenesis (new synapse formation)
Long-term potentiation (LTP) — the cellular basis of learning and memory
Hippocampal neurogenesis

Semax also upregulates NGF (important for cholinergic neuron maintenance) and modulates the serotonin system, which contributes to its anxiolytic-adjacent effects.

Intranasal Delivery

Intranasal administration is preferred over injection for Semax because:

The olfactory bulb provides a direct CNS entry pathway (bypasses blood-brain barrier)
Onset is faster (5–15 minutes vs 30–60 for subcutaneous)
Higher CNS bioavailability per dose
More convenient and less invasive

Standard intranasal protocol: 1–3 drops of 0.1% solution (100–300mcg) per nostril, once in the morning. Some research protocols divide into morning and midday doses.

Semax vs N-Acetyl Semax

The acetylated form (N-Acetyl Semax) is considered more potent and longer-lasting due to improved resistance to peptidases. Many experienced users prefer N-Acetyl Semax at lower doses over standard Semax at higher doses. See the N-Acetyl Semax profile for details.

Semax + Selank Stack

The most common nootropic peptide combination:

Semax: BDNF upregulation, focus, cognitive drive
Selank: GABAergic anxiolysis, stress reduction, immune modulation

The combination is often described as producing "calm focus" — Semax provides mental sharpness while Selank counteracts any anxiety or over-stimulation. Alternating doses (Semax AM, Selank PM) is common.

Clinical Applications (Russian Data)

Ischemic stroke — Phase 3 data in Russia shows improved neurological recovery scores
ADHD — uncontrolled clinical observations suggest benefit
Glaucoma — neuroprotective effects on retinal ganglion cells studied
Optic nerve injury — recovery support in animal models