Encyclopedia entry
Semax
Oliver Mackman · Editorial director · Best Business Loans Ltd (16833937)
Last updated 2026-05-20
Semax is a synthetic heptapeptide developed by the Institute of Molecular Genetics of the Russian Academy of Sciences. It is based on residues 4 to 10 of adrenocorticotropic hormone (ACTH), extended by a Pro-Gly-Pro sequence to increase metabolic stability. The compound is registered in Russia for indications related to stroke recovery and certain cognitive and vascular conditions. Outside Russia, including in the UK and the broader EU, Semax has no marketing authorisation from any regulator. It is sold by UK research-peptide retailers under "research use only, not for human or animal consumption" framing. PeptideClear publishes encyclopedia commentary only and does not recommend human use.
What the Russian clinical literature shows
- · Animal studies from the Russian Academy of Sciences reported neuroprotective effects in rodent models of ischaemia and memory impairment.
- · Russian clinical studies have examined Semax in stroke recovery settings as an intranasal preparation. These studies were conducted within Russian healthcare institutions and supported the domestic regulatory submission.
- · Some papers report brain-derived neurotrophic factor (BDNF) modulation in animal models, which formed part of the mechanistic rationale for the neuroprotection hypothesis.
- · The Russian clinical dossier supported registration as an intranasal pharmaceutical for neurological indications within Russia.
- · As with Selank, the clinical studies generally used designs and sample sizes that would not meet current FDA, EMA, or MHRA standards for a marketing authorisation application. Russian regulatory requirements at the time of submission differed from western regulatory standards.
- · Russian pharmacy availability does not constitute evidence of efficacy by western regulatory standards, and Russian registration does not apply in the UK or EU.
Sister compound: Selank (see Selank encyclopedia entry) is a separate Russian-developed peptide with a different mechanism, targeting anxiolytic rather than neuroprotective indications, often discussed alongside Semax.
UK regulatory status
- · Not a controlled drug under the Misuse of Drugs Act 1971.
- · Not scheduled under the Psychoactive Substances Act 2016.
- · No MHRA marketing authorisation as a medicine in the UK.
- · Not authorised by the EMA for use in any EU member state.
- · Russian registration does not apply in the UK or EU regulatory jurisdictions.
- · Sold legally as a research chemical by UK retailers when marketed without therapeutic claims.
- · Becomes an unlicensed medicinal product the moment a retailer or commentator makes therapeutic claims about it.
Where to learn more
- · PubMed search: "Semax" returns Russian-authored preclinical and clinical papers, some available in English translation or published in English-language journals.
- · The Institute of Molecular Genetics (Russian Academy of Sciences) publications are the primary source for Semax research.
- · UK retailer purity comparison: research peptides UK retailers.
- · Certificate of analysis guidance: COA Trust Index.
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