Semax
Also known as: ACTH(4-10) analog
By GLPeptideSciences Editorial Team · How we evaluate evidence · Reviewed by Dr. George S. Watson, MD, Cardiothoracic Surgeon · Updated 2026-06-02
A synthetic peptide derived from a fragment of ACTH, developed and used clinically in Russia and discussed for cognition and neuroprotection.
What it is & how it works
What it is
Semax is a synthetic peptide based on a fragment of ACTH (adrenocorticotropic hormone), modified for stability. It was developed in Russia, where related peptides have regional clinical use.
How it is thought to work
Research associates Semax with effects on BDNF (brain-derived neurotrophic factor) and other neurotrophic and neuromodulatory pathways, which is the proposed basis for the cognitive and neuroprotective effects studied in regional literature.
The evidence gap
The distinguishing feature here is where the evidence comes from: there is genuine human research, but it sits largely outside the large Western randomized-trial system, so claims should be read as promising-but-not-broadly-validated. Day-to-day “focus” reports are anecdotal.
What it's discussed & studied for
- Focus and cognitive performance (anecdotal)
- Neuroprotection
- Stress resilience (anecdotal)
Discussion of a use is not a claim that it works or is approved.
Research status
Has clinical use and a research base in Russia; limited large-scale Western trial validation.
Evidence quality
Mixed. Some human research exists (primarily Russian); it is not broadly validated by large Western randomized trials. Performance claims are largely anecdotal.
Dosing discussion
Typically discussed as an intranasal solution in microgram doses. This reflects regional clinical use and community convention, not Western-approved guidance.
Educational summary of what is discussed in the literature and community — not a dosing recommendation or medical advice.
Safety & harm reduction
Generally reported as well tolerated in available literature, but long-term and Western safety data is limited. Not FDA-approved.
Sourcing literacy
Concentration accuracy and sterility of intranasal preparations matter. Verify identity and purity with third-party testing.
Selected literature
FAQ
Is Semax approved in the US?
No. It has regional clinical use elsewhere (notably Russia) but is not FDA-approved.
Is the evidence strong?
It's mixed. There is human research, much of it regional, but not the large Western randomized-trial base that would make claims definitive.