Peptides · peptide
Semax
Met-Glu-His-Phe-Pro-Gly-Pro, an ACTH(4-7) analog
Also sold as: Semaks · ACTH(4-7) analog · N-Acetyl Semax · Semax amidate
A heptapeptide nootropic registered as a medicine in Russia but not approved by the FDA, sold elsewhere as a research chemical in several distinct chemical forms.
What the evidence says
Graded on the compound profile, not restated here.
Semax
A heptapeptide nootropic derived from ACTH(4-10), registered as a medicine in Russia but not approved by the FDA or in most of the world. Human data exists but sits almost entirely in Russian-language literature that is hard to independently verify.
- CPreliminaryCognitive / nootropic effectsHuman data exists but is mostly Russian and hard to verify independently.
- CPreliminaryIschemic stroke / neuroprotection recoveryUsed clinically in Russia; evidence base is regional and not independently replicated.
- DPreclinicalBDNF / neurotrophic mechanismPreclinical mechanism, mostly in rodents.
- UUnknownLong-term human safetyPoorly characterized outside Russian clinical use; no independent long-term data.
Semax has a genuine research history — the compound profile grades its cognitive and stroke-recovery evidence at C, which is higher than most of this catalog. It is also registered as a medicine in Russia.
Neither fact tells you anything about the vial in front of you.
Registration applies to a product, not a molecule
This is the misreading that does the most work in Semax marketing. A pharmaceutical registration covers a specific manufacturer’s product, made to a specific standard, with documented identity and sterility. A research-chemical vial bought online is not that product, and the registration does not extend to it.
The same logic applies to the clinical literature: it studied the registered preparation.
Which Semax are you buying?
Three forms circulate under overlapping names — plain Semax, N-Acetyl Semax, and N-Acetyl Semax Amidate. The modifications change the molecule and are claimed to change its duration, which means they are also claimed to justify a price difference.
A certificate that names the trade form but not the sequence and modification has not confirmed which one is in the vial. Ask for both, and for the mass-spec result that distinguishes them — the acetyl and amidate groups are exactly the detail a substituted product would omit.
Most of the human work sits in Russian-language literature that is hard to verify independently, which is worth holding alongside the C grade.
Before you buy
- Establish which form you are buying. Semax, N-Acetyl Semax, and N-Acetyl Semax Amidate are different molecules sold under overlapping names.
- Require the sequence and modification stated explicitly on the COA, not just the trade name.
- Confirm mass-spec identity — the acetyl and amidate modifications change the mass and are the cheapest thing to omit.
- Treat Russian pharmaceutical registration as irrelevant to what a grey-market vial contains. Registration applies to a specific manufacturer's product.
What is sold
- Forms
- Lyophilized vial · Nasal spray solution
- Typical price
- $36.99–$74.99 depending on strength Indicative only. Not a live price.
- Storage
- Supplied lyophilized or as a prepared nasal solution. Prepared solutions carry the shorter shelf life and depend on the preservative used.
Last reviewed 2026-08-24.