Semax
Shop SemaxAlso called: Semax and Selank
Semax is a man-made copy of a tiny piece of a natural hormone found in the body. It was first made in Russia. Doctors there have used it for brain and eye problems. In the United States, it is not an approved medicine.
People are interested in Semax because early research suggests it may help the brain. It may protect brain cells from damage, help with focus and memory, and lift low mood. Scientists think it works by changing brain chemicals that affect attention and stress. It may also help nerves grow and survive.
Much of the research so far has been done in labs or on animals, with only a few careful human studies. That means we still do not know how well it works or how safe it is for long-term use. In the U.S., some people buy it from overseas sellers, but those products are not checked for purity or correct dosing. A federal advisory group recently suggested Semax could be allowed for special pharmacies that mix custom medicines, but no final rule has been made. Always talk to a doctor before trying it.
Regulatory status
Semax is an approved medicine in Russia for ischemic stroke, cognitive and neurological indications; it is not approved by the US FDA or the EMA. On July 24, 2026, PCAC voted 8–5 to recommend adding Semax to the Section 503A Bulks List. The recommendation is advisory only — FDA rulemaking (typically 12–24 months) must conclude before any change in legal status. Semax is not on the 503A Bulks List, remains an unapproved new drug, and may not be lawfully compounded by traditional 503A pharmacies in the interim.
Benefits
What Semax Helps With
The main themes across 30 research studies, in plain language.
Neuroprotection & cognitive
Cognitive performance & memory
50/100Rated 50/100Source typeUnclassified sourceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 44 underlying claimsResearch suggests potential benefits for enhancing memory, attention, learning speed, and overall cognitive performance.
Stroke & brain injury recovery
50/100Rated 50/100Source typeUnclassified sourceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 28 underlying claimsStudies indicate potential to support neurological recovery and protect brain tissue following stroke, trauma, or ischemia.
Neurotrophic factor upregulation
72/100Rated 72/100Source typeEstablished referenceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 27 underlying claimsResearch indicates it may stimulate the production of key proteins like BDNF and NGF that support neuron growth and survival.
Stress resilience & mood support
50/100Rated 50/100Source typeUnclassified sourceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 20 underlying claimsEvidence suggests it may modulate stress pathways and neurotransmitters to reduce anxiety without causing sedation.
Neurotransmitter system modulation
50/100Rated 50/100Source typeUnclassified sourceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 18 underlying claimsResearch points to effects on dopamine, serotonin, and GABA systems that may influence brain function and behavior.
Neural defense & antioxidant activity
72/100Rated 72/100Source typeEstablished referenceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 15 underlying claimsStudies suggest it may help protect brain cells from oxidative stress, inflammation, and toxic proteins like amyloid-beta.
Vision & optic nerve health
60/100Rated 60/100Source typeSpecialist communityIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 4 underlying claimsResearch suggests potential protective effects for the optic nerve and treatment of pathologies like glaucoma.
Gastrointestinal & gut barrier support
72/100Rated 72/100Source typeEstablished referenceIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 4 underlying claimsEvidence suggests potential to protect the stomach lining and support the integrity of the intestinal barrier.
Immune modulation & inflammation
60/100Rated 60/100Source typeSpecialist communityIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 9 underlying claimsResearch suggests potential to regulate immune response genes and reduce pro-inflammatory mediators.
Gene expression & longevity markers
60/100Rated 60/100Source typeSpecialist communityIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 4 underlying claimsStudies suggest it may influence gene expression profiles and markers associated with aging, such as telomerase activity.
Cellular energy & mitochondrial function
60/100Rated 60/100Source typeSpecialist communityIndependent sources3Every claim links to the page it came from, and stronger sources rate higher. Full methodology →· 6 underlying claimsPreliminary research indicates potential roles in supporting mitochondrial health and cellular bioenergetics.
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How People Use It
2 reported routines — each line links to the source it came from.
From published sources
Routines as reported in peer-reviewed papers, clinical guidance, or vetted media — each linked to the source it came from.
SubQ
- 2 to 3 drops per nostril, 2 to 3 times daily (200 to 900 mcg/day) 95/100Rated 95/100Source typePeer-reviewed studyIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →↗ source
Self-reported & vendor-suggested
Routines shared by users and sellers in forums and product pages — anecdotal, not tested in clinical trials. We show them for completeness, not as a recommendation.
General
- 200–500 mcg once daily SC (intranasal: 600–1500 mcg/day) 60/100Rated 60/100Source typeSpecialist communityIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →↗ source
- Weeks 1–2 — 200 mcg · 12 units (0.12 mL)
- Weeks 3–4 — 300 mcg · 18 units (0.18 mL)
- Weeks 5–6 — 400 mcg · 24 units (0.24 mL)
- Weeks 7–12 — 500 mcg · 30 units (0.30 mL)
mg vs mcg: one milligram (mg) equals 1,000 micrograms (mcg) — multiply by 1,000 going from mg to mcg, divide by 1,000 going from mcg to mg. Mixing the two up is a thousand-fold dosing error: 1 mg taken instead of 1 mcg is a 1,000× overdose; 1 mcg instead of 1 mg is a 1,000× underdose. Always double-check the unit label and the decimal place.
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Evidence
Research Citations (27)
Every claim above traces back to a source you can check — here are 27 of them.
- Source
Effect of semax on the temporary dynamics of brain-derived neurotrophic factor and nerve growth factor gene expression in the rat hippocampus and frontal cortex
2008 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
A nootropic adrenocorticotropin analog 4-10-semax (l5 years experience in its design and study)
1997 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Semax and selank inhibit the enkephalin-degrading enzymes from human serum]
2001 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Neuroprotective and antiamnesic effects of Semax during experimental ischemic infarction of the cerebral cortex.
2006 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
N-terminal degradation of ACTH(4-10) and its synthetic analog semax by the rat blood enzymes.
1991 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Semax in the treatment of glaucomatous optic neuropathy in patients with normalized ophthalmic tone
2001 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Therapy of peptic ulcer with semax peptide.
2002 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Semax, an analog of ACTH(4-10) with cognitive effects, regulates BDNF and trkB expression in the rat hippocampus.
2006 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Effects of Semax on dopaminergic and serotoninergic systems of the brain.
2004 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Semax, an ACTH(4-10) analogue with nootropic properties, activates dopaminergic and serotoninergic brain systems in rodents.
2005 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Effects of chronic Semax administration on exploratory activity and emotional reaction in white rats
2007 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Heptapeptide semax attenuates the effects of chronic unpredictable stress in rats.
2013 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Semax attenuates the influence of neonatal maternal deprivation on the behavior of adolescent white rats.
2012 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
Therapeutic possibility of "Semax" for depression.
2008 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology → - Source
The Peptide Drug ACTH(4-7)PGP (Semax) Suppresses mRNA Transcripts Encoding Proinflammatory Mediators Induced by Reversible Ischemia of the Rat Brain
2021 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
Timeline
History & Milestones
Key moments in Semax’s research and regulatory timeline — sourced and dated.
- The peptide semax affects the expression of genes related to the immune and vascular systems in rat brain focal ischemia: genome-wide transcriptional analysisPublicationMar 24, 2014Related:Semax
News
Latest on Semax
Dated, sourced reporting that mentions Semax.
New York Times sorts peptide-therapy hype from evidence across skincare, muscle-building, and longevity
A November 2025 New York Times explainer takes a skeptical consumer lens to the peptide-therapy craze, separating the few uses with reasonable evidence (topical GHK-Cu and Matrixyl-type peptides in skincare) from the largely unproven injectable and "biohacking" market (BPC-157, TB-500, epitalon, semax, selank). Dermatologists frame cosmetic peptides as "sidekicks, not hero ingredients," while endocrinologists warn that growth-hormone-releasing peptides like sermorelin and tesamorelin carry the same long-term risks as HGH — diabetes, certain cancers, and acromegaly. The piece notes that most longevity claims rest on cell-culture or animal data only, and that "research-grade" products have no quality controls.
Tailor Made Compounding LLC
FDA warned Tailor Made Compounding LLC (Nicholasville, KY) after a 2018 inspection found it compounded drug products with bulk substances ineligible for 503A exemptions. The letter explicitly lists the compounded substances: Follistatin, GHRP-2, GHRP-6, AOD 9604, BPC 157, Bremelanotide (PT-141), Cerebrolysin, DSIP, Epitalon, GHK-Cu, Ipamorelin, LL-37, Melanotan II, Selank, Semax, and CJC 1295, among others. The firm was cited for insanitary aseptic processing (adulteration), unapproved new drugs, and misbranding, and removed GHRP-2 and GHRP-6 from its formulary in response.
FDA PCAC 2026: committee backs six peptides for compounding, rejects Emideltide
On July 23–24, 2026, the FDA's Pharmacy Compounding Advisory Committee recommended adding six of seven reviewed peptides (BPC-157, KPV, TB-500, MOTS-c, Epitalon, Semax) to the Section 503A Bulks List and rejected Emideltide/DSIP. The vote is advisory only — not a final FDA decision and not legal authorization to compound. FDA must still complete formal notice-and-comment rulemaking (typically 12–24 months) before any change in legal status.
Wondering how Semax pricing compares across suppliers? Our original market data shows the full picture.
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