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Research peptide — not a dietary supplement
Semax is a research compound, not a regulated dietary supplement. It is typically administered by injection and sold “for research use only.” The evidence below is largely preclinical (animal and in-vitro) or early-stage, so no evidence score is assigned. This page is provided for transparency and education — it is not a recommendation to use. Consult a qualified healthcare provider, and be aware that purity, dosing, and legal status vary by jurisdiction.
What the evidence says
Most Semax studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from mixed-quality studies published 2005–2025 with a typical study size of 52 participants.
Based on 11 studies · 186 total participants
Confidence
LowBy outcome
The current evidence for Semax is insufficient to assign an evidence score, based on 11 indexed studies. A synthetic heptapeptide (an analogue of the ACTH(4-10) fragment) developed in Russia and used there intranasally as a neuroprotective 'nootropic' for ischemic stroke and cognition. Honest appraisal: the mechanistic evidence (BDNF/TrkB induction, monoamine modulation, neuroprotection) is mostly rat and cell studies from a small cluster of Russian labs, and the human data are Russian stroke/cognition trials of variable rigor with very little independent replication. It is NOT a regulated dietary supplement outside Russia — sold 'for research use only', with no Western regulatory approval and unknown long-term safety. Representative study: PMID 16996037.
The commonly studied dose of Semax is No Western-validated dose exists. In Russia, Semax is sold as a 0.1% or 1% intranasal solution; published stroke protocols used roughly 6000 mcg/day intranasally in courses (e.g. two 10-day courses), and rodent neurotrophic studies used ~50 microg/kg. These figures come from Russian practice and are not validated outside Russia; they are not a recommendation.. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Casein Hydrolysate
Mostly mechanism / observationalA milk-derived bioactive peptide — a tryptic hydrolysate of bovine αs1-casein standardized to the decapeptide α-casozepine (Lactium) — marketed for stress, anxiety, and sleep. Honest appraisal: the mechanism is real and food-derived (α-casozepine binds the benzodiazepine site of the GABA-A receptor in vitro), and a handful of small human RCTs show modest reductions in stress symptoms and cortisol plus some sleep-diary improvements. But several trials are industry-linked, two well-designed sleep RCTs were null on their primary endpoint, and effects are small. Well-tolerated; this is an ordinary dietary supplement, not a drug.
Last reviewed June 2026 · evidence from 11 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Semax (ACTH(4-10) analogue, Met-Glu-His-Phe-Pro-Gly-Pro)
A synthetic heptapeptide (an analogue of the ACTH(4-10) fragment) developed in Russia and used there intranasally as a neuroprotective 'nootropic' for ischemic stroke and cognition. Honest appraisal: the mechanistic evidence (BDNF/TrkB induction, monoamine modulation, neuroprotection) is mostly rat and cell studies from a small cluster of Russian labs, and the human data are Russian stroke/cognition trials of variable rigor with very little independent replication. It is NOT a regulated dietary supplement outside Russia — sold 'for research use only', with no Western regulatory approval and unknown long-term safety.
Emerging because evidence is mostly rat and cell studies from a small cluster of Russian labs, with human stroke/cognition trials that are small, often unblinded, and not independently replicated.
Semax is a synthetic heptapeptide (Met-Glu-His-Phe-Pro-Gly-Pro) built from the ACTH(4-7) fragment of adrenocorticotropic hormone plus a C-terminal Pro-Gly-Pro (PGP) tripeptide added to slow enzymatic breakdown.
It was developed in Russia, where it is registered and used intranasally for ischemic stroke, transient ischemic attacks, optic-nerve disease and cognitive/attention complaints.
The proposed mechanisms are reasonably well characterized at the molecular level but almost entirely in animals and cells: a single intranasal dose raises BDNF protein and TrkB receptor expression/phosphorylation in the rat hippocampus and basal forebrain (where saturable, specific Semax binding sites have been described), and Semax modulates dopaminergic and serotonergic systems, supports cholinergic neuron survival, and broadly shifts the brain transcriptome toward neurotrophic/anti-inflammatory programs after experimental stroke.
The honest evidence picture is that this entire mechanistic literature comes from a small number of Russian research groups (chiefly the Institute of Molecular Genetics / Zakusov Institute, Moscow), with limited independent replication; a handful of newer non-Russian preclinical papers (e.g. a 2025 Chinese mouse spinal-cord-injury study, Italian copper/amyloid chemistry work) exist but address different endpoints.
The human evidence is likewise mostly Russian: clinical reviews report that Semax is effective in acute and recovery-phase ischemic stroke, and a 110-patient open study found that adding Semax raised plasma BDNF and improved Barthel-index recovery.
There are also small fMRI studies in healthy volunteers showing acute changes in resting-state connectivity.
These trials are generally small, frequently unblinded or non-randomized, single-region, and have not been replicated by independent Western groups, so they cannot be read as establishing efficacy to Western regulatory standards.
Semax has no FDA/EMA approval, is sold elsewhere 'for research use only', and its long-term safety is uncharacterized. Overall evidence is Emerging.
In rats, a single intranasal dose of Semax raises BDNF protein and exon-III BDNF mRNA and increases TrkB receptor expression and phosphorylation in the hippocampus and basal forebrain, where specific saturable Semax binding sites have been described. This neurotrophic mechanism is proposed to underlie its cognitive and neuroprotective effects; it is demonstrated mainly in animals and cells, not in human target tissue.
Semax retains the behaviourally active core of the ACTH(4-10) melanocortin fragment but lacks the hormone's corticotropic (steroid-releasing) action. Like other non-corticotropic ACTH-fragment analogues, it is reported to exert neurotrophic and neuroprotective effects on the nervous system. This places it in the melanocortin/ACTH-analogue class rather than acting on a single classical .
How Semax works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Tap node to isolate • Pinch to zoom • Tap edge for research
No Western-validated dose exists. In Russia, Semax is sold as a 0.1% or 1% intranasal solution; published stroke protocols used roughly 6000 mcg/day intranasally in courses (e.g. two 10-day courses), and rodent neurotrophic studies used ~50 microg/kg. These figures come from Russian practice and are not validated outside Russia; they are not a recommendation.
Can be taken without food
| Form | Type |
|---|---|
| 💊None — no Western-approved, quality-controlled product exists | Recommended |
Semax is a registered drug in Russia but a research chemical elsewhere. Outside Russia there is no regulator-sanctioned, quality-controlled product.
Minimum: 1 weeks
Optimal: 2 weeks
Cycling: Not required
Note: Intranasal dosing; nootropic use is anecdotally daytime. No Western-validated timing exists.
Dose-response data unavailable. The current published research for Semax does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
The human efficacy evidence for Semax is almost entirely Russian (stroke, cognition, attention), generally small and of variable rigor, with little independent or Western replication. It is not an approved medicine outside Russia and its benefits are not established to Western regulatory standards.
Russian clinical reviews and an open 110-patient study report that intranasal Semax added to rehabilitation raises plasma BDNF and improves functional recovery (Barthel index) after ischemic stroke. Promising but not independently replicated.
Semax is marketed and used for memory, attention and mental arousal. Direct human cognitive-outcome trials are sparse; the main controlled human data are small fMRI studies in healthy volunteers showing acute changes in resting-state brain networks, not validated cognitive-performance gains.
Rat focal-ischemia and cell-culture studies report that Semax induces neurotrophins, supports cholinergic neuron survival, protects neurons against glutamate excitotoxicity, and shifts the post-stroke transcriptome toward anti-inflammatory/neurotrophic programs. Mechanistic and preclinical, not human outcomes.
Long-term human safety has not been characterized in independent studies, and grey-market 'research use only' product has unverified identity and purity. Absence of reported harm is not evidence of safety.
Avoid — not adequately studied in pregnancy or lactation.
Be aware Semax is not approved by the FDA or EMA and is sold 'for research use only'; quality is unverified.
Use caution — an unapproved experimental peptide whose status in sport is unclear.
In rodents Semax potentiated amphetamine-evoked dopamine release and locomotion. Whether this translates to additive stimulant/arousal effects in humans is unknown, so combining with stimulants or dopaminergic drugs is unpredictable and warrants caution.
Some Russian work attributes mild anticoagulant activity to Semax and related glyproline peptides in experimental systems. Clinical relevance in humans is unestablished; treat any combination with blood thinners cautiously.
Tip: Inherent to intranasal dosing; reduce volume or frequency.
Tip: No independent long-term human safety data exist; absence of reported harm is not evidence of safety.
Tip: Stems from grey-market sourcing outside Russia rather than the peptide itself; there is no verified Western product.
The best time to take Semax is in the morning. It can be taken on an empty stomach. Semax is given intranasally because the peptide does not survive oral digestion and intranasal delivery is the route used in essentially all Russian human studies.
Semax should be used with caution — talk to a healthcare provider before taking it. The most commonly reported side effects are nasal irritation / discomfort, unknown long-term effects, risks from unregulated 'research use only' product (mislabelling, contamination, wrong concentration). Use caution if any of these apply to you: Pregnancy and breastfeeding — not adequately studied; avoid entirely; Known hypersensitivity to the peptide; Any use expecting a regulated, quality-controlled medicine — Semax is a research chemical outside Russia, not an approved drug or dietary supplement in Western markets.
Cerebrolysin
Mostly mechanism / observationalAn injectable neuropeptide preparation made from enzymatically digested pig (porcine) brain tissue — a mix of low-molecular-weight peptides and free amino acids marketed as a neurotrophic agent for stroke, dementia and traumatic brain injury. It is approved and widely used in Russia, China and parts of Europe/Asia, but is NOT FDA-approved. Honest appraisal: the highest-quality syntheses contradict the marketing. The Cochrane review of acute ischaemic stroke found no benefit on death or function and a possible harm signal (more non-fatal serious adverse events); the Cochrane review of vascular dementia rated the evidence very-low-quality and warned any benefit may be too small to matter. Many positive trials and meta-analyses are industry-funded and heterogeneous.
In rodents Semax increases striatal serotonin turnover (5-HIAA) and potentiates amphetamine-evoked dopamine release and locomotion, linking the melanocortinergic system to monoaminergic 'arousal/attention' circuits. These are animal neurochemistry findings, not validated human receptor pharmacology.