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Encyclopedia entry

Semax

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Oliver Mackman · Editorial director · Best Business Loans Ltd (16833937)

Last updated 2026-05-20

Semax: a 7-amino-acid synthetic analog of ACTH (4-10). Registered as a pharmaceutical in Russia for stroke recovery and cognitive indications. Not licensed by MHRA or EMA. Research use only in the UK.

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

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

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Reviewed by Oliver Mackman, editorial director · last reviewed 2026-05-20