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Nootropics & cognitive

Semax

Russian-developed nootropic peptide, approved as a prescription drug in Russia for stroke recovery and cognitive/attention support. Widely used off-label elsewhere as a nasal-spray nootropic.

Approved in Russia Nootropics & cognitive

Reviewed 2026-09-12
Full name
Semax (a synthetic ACTH(4-10) analog)
Also known as
Semax, N-Acetyl Semax Amidate
Regulatory status
Approved prescription drug in Russia (for ischemic stroke, optic nerve atrophy, and ADHD-type attention difficulties). Not approved in the US, EU, or most other countries; used there as a research chemical/off-label nasal spray.
Variant note
Sometimes sold as 'NA-Semax amidate' (N-acetyl, amidated form) rather than the original Semax sequence. The amidate modification is intended to improve stability, and community reports treat it as roughly interchangeable in effect, but it has not been independently studied to the same extent as the parent compound.

Origin

Developed by Russian researchers at the Institute of Molecular Genetics, Russian Academy of Sciences, in the 1980s. Derived from a fragment of ACTH but modified to remove ACTH's hormonal (adrenal-stimulating) activity while keeping its CNS effects.

Mechanism

Increases brain-derived neurotrophic factor (BDNF) expression in animal studies, modulates dopaminergic and serotonergic signalling, and shows neuroprotective and antioxidant effects in stroke and hypoxia models. It doesn't act like a stimulant; effects are described as neuroplasticity and neuroprotection support rather than acute energizing.

Research summary

Evidence

Russian clinical trials, the basis for its drug approval, studied it in ischemic stroke patients, showing improved neurological outcome scores in some trials versus standard care, and in children with attention difficulties. This evidence, like Epithalon's, comes largely from a research tradition with less rigorous international peer review and independent replication than Western regulatory standards require, so weight it accordingly even with genuine drug approval in its country of origin.

Evidence tier: Approved in Russia — see the methodology note for how this is assessed.

Citations

Reported benefits

  • Reported improvements in focus, mental clarity and motivation, commonly described by users as smoother/less jittery than stimulants
  • Reported mood-lifting effect by some users
  • Interest for post-concussion or general cognitive-recovery support, extrapolating from its stroke-recovery research

Dosing protocols reported in the literature & community

These are protocols reported by compounding pharmacies, published trials, or self-experimentation communities — not a prescription. Start low, especially for anything new.

Reported dosing protocols
RouteReported protocol
Intranasal sprayCommonly reported doses are 200-600 mcg per dose (a few sprays), once to a few times per day; because tolerance/desensitization is reported by some users with continuous daily use, many self-experimenters cycle it (e.g. several days on, then a break) rather than dosing continuously long-term.

Side effects

  • Generally reported as well tolerated at typical nasal-spray doses
  • Nasal irritation from the spray itself
  • Some users report reduced subjective effect with continuous daily use, prompting cycling protocols
  • Long-term safety data at self-administered doses outside Russian clinical trial contexts is limited

Safety notes

Safety: The Russian drug-approval status is a genuine point in its favor relative to purely speculative research peptides, but comes from a regulatory tradition with less overlap with FDA/EMA-style trial and review standards, worth more independent scrutiny from Western readers.
Community & reddit notes (anecdotal — not clinical evidence)

One of the more popular 'Russian peptide' nootropics, often discussed alongside Selank as a complementary pair: Semax for focus/motivation, Selank for anxiolytic/calming. Reports of diminishing effect with continuous use are common enough that cycling is standard practice, not a niche precaution.

Used in stacks

Community combinations that include Semax — see each stack page for the combination-specific rationale and evidence.

Mixing compatibility

Pulled from a community-charted mixing-compatibility reference (anecdotal, clinic-use, and community-reported signals) — not a safety guarantee. Verify independently before combining anything.

Used together in wellness-clinic protocols

Anecdotally combined (outside clinic protocols)

Reported as a combination to avoid