Semax Dosage: Russian Clinical Use vs US Status
Last updated May 19, 2026 · Reviewed by Grey Peptides Editorial Board · ✓ Primary-sourced
← Semax encyclopedia entry · See also: Selank dosage · Regulatory tracker
Semax is a genuine approved medicine in Russia (it is on the Russian list of vital and essential drugs), developed at the Institute of Molecular Genetics. But it has never been FDA-approved, and in the US it circulates as an unregulated research chemical or a compounded preparation. The dosing below reflects Russian clinical and community practice — it is documented for education, not offered as instructions for US self-use.
The short version
Semax is a short peptide derived from the ACTH(4-10) fragment, used intranasally and studied mainly in Russia as a nootropic and neuroprotective agent — including in stroke and cognitive contexts. Its dosing story is unusual on this site because, unlike the purely research-grade peptides, Semax actually has a regulated clinical history — just not in the US. That makes the honest framing "approved there, unapproved here," and it changes what a "dose" means depending on where you are.
Intranasal dosing as reported
Russian clinical and community sources most commonly describe intranasal administration in the following range. These are descriptive, and US-sourced product is not the regulated Russian medicine.
| Parameter | Commonly reported |
|---|---|
| Amount | ~250–600 mcg per dose |
| Frequency | 2–3× daily |
| Route | Intranasal (drops/spray) |
| Form | Often a percentage solution (e.g. 0.1%) |
The intranasal route is used because peptides are poorly absorbed orally; nasal delivery also offers a potential route toward the central nervous system. Concentrations are sometimes described as "0.1%" or "1%" nasal drops in Russian products, which is a different way of expressing the same microgram-per-drop idea.
The US picture and its risks
In the US, Semax is not an approved drug and is not recognized as a dietary supplement, so it reaches users through research-chemical vendors or compounding pharmacies. That introduces the familiar problems of an unregulated product — unverified identity, purity, and dose — and the FDA has specifically raised immunogenicity concerns about compounded peptides (the risk that impurities provoke an immune response). For reconstituted nasal solutions there is the added issue of sterility, since nasal mucosa is sensitive to contamination. See the Regulatory Status Tracker for how foreign-approved peptides are treated in the US.
Frequently asked questions
Is Semax a banned substance in sport?
Because it lacks approval by major Western regulators, anti-doping frameworks may treat it under the category for substances with no approved therapeutic use; athletes should assume it is potentially prohibited and check with their authority.
Is it the same as Selank?
No — they are different peptides from the same Russian program. Semax is framed as pro-cognitive/neurotrophic, Selank as anxiolytic. See the Selank dosage page.
Can a US doctor prescribe it?
It is not an FDA-approved product, so it is not a standard prescription item; any US access is through compounding or unregulated channels, which is why supervision and product verification matter.
Sources
- Russian Federation List of Vital and Essential Drugs (Semax listed); Institute of Molecular Genetics, Russian Academy of Sciences.
- Dolotov OV, et al. Semax and BDNF / neurotrophin signaling. Brain Res.
- U.S. FDA — Drugs@FDA database (no Semax approval); FDA statements on compounded-peptide immunogenicity.
Medical disclaimer: Education only, not medical advice. Semax is not FDA approved; US-sourced product is unregulated. Dosing figures reflect Russian clinical/community practice, not a recommendation. Consult a licensed clinician.