Semax

Semax is a synthetic heptapeptide developed in the 1980s at the Institute of Molecular Genetics of the Russian Academy of Sciences. It is a modified fragment of adrenocorticotropic hormone (ACTH 4-7) with a Pro-Gly-Pro tail that protects it from enzymatic degradation. It is one of the most clinically studied nootropic peptides in the world — used in Russia and parts of Eastern Europe as a registered medication for stroke recovery, cognitive dysfunction, and optic nerve disorders. Outside those regions it is sold strictly for laboratory research.

Semax is the most famous focus-and-memory peptide in the research world. Developed by Russian scientists as a stable, non-hormonal piece of ACTH, it is used intranasally and produces noticeable cognitive effects — sharper focus, improved working memory, better mood — within minutes for many users. It has decades of clinical use in Russia for stroke recovery and is one of the few research peptides with substantial published human data.

Semax acts on multiple brain systems: it upregulates BDNF (brain-derived neurotrophic factor) and NGF (nerve growth factor) within hours, modulates dopaminergic and serotonergic signaling in the prefrontal cortex, and activates the melanocortin system without hormonal HPA effects. The combined neurotrophic and neurotransmitter effects underlie its acute focus benefits and longer-term neuroprotective profile.

• •Ischemic stroke recovery (Russian clinical use)
• •Cognitive function and memory
• •BDNF and NGF upregulation
• •Optic neuropathy
• •ADHD and attention research
• •Anxiety and mood regulation

Semax is the default 'try this first' peptide in nootropic communities — r/Nootropics, LongeCity, biohacking subreddits. Users describe rapid noticeable focus and motivation effects. Most run short cycles (2–4 weeks) followed by breaks. The intranasal format is convenient compared with injectables. N-Acetyl Semax Amidate (NASA) is a longer-acting variant frequently discussed.

“Russian focus peptide that hits like a clean cup of coffee.”

Frequently combined with Selank for focus + calm together, with NAD+ precursors and Dihexa in longer cognitive stacks, and with Cerebrolysin cycles for restorative neurological research.

Semax is a Russian-developed heptapeptide nootropic derived from ACTH 4-7, used intranasally for focus, memory, and stroke recovery research. It upregulates BDNF and NGF, has decades of clinical use in Russia, and is sold for laboratory research elsewhere.