Educational content only — this is not medical advice. Nothing here is a recommendation to buy, obtain, or use Semax. Talk to a licensed clinician before making health decisions.
What it is
Semax is a 7-amino-acid peptide (Met-Glu-His-Phe-Pro-Gly-Pro) derived from adrenocorticotropic hormone. It is used in Russia as a nasal spray for acute ischemic stroke, cognitive impairment, and optic nerve atrophy. It is thought to modulate BDNF expression and neurotrophic signaling.
What the evidence shows
Russian clinical studies and animal models suggest neuroprotective, anxiolytic, and cognitive-enhancing effects. A small body of Western preclinical work supports effects on brain-derived neurotrophic factor (BDNF) and cerebral blood flow. However, no large, randomized, placebo-controlled Western trial has established efficacy for cognitive enhancement or neuroprotection.
Risks & unknowns
Semax has a long use history in Russia with few reported serious adverse events. Common effects include mild irritation of the nasal mucosa, headache, and transient anxiety. Because it is not regulated in the United States, product authenticity and purity are concerns.
Legal / regulatory status
Semax is approved in Russia for limited neurological indications. It is not FDA-approved in the United States. In sport, it is not specifically listed by WADA as of 2026, but peptide hormones and related substances are broadly prohibited under S2.