An ACTH-fragment-derived peptide studied in neuroprotection research.
Semax is a synthetic peptide derived from a fragment of ACTH (the 4-10 region) studied in neuroprotective and cognition-related research models. It is sold strictly as a research material.
In animal and in-vitro models, researchers have examined this compound's relationship to:
These are areas of laboratory investigation, not established outcomes in people. For primary literature, see PubMed — Semax neuroprotection research.
Part of the Neurological category. Related: Selank · Dihexa · Neurological hub
This compound is sold in the U.S. for research use only and is not approved for human consumption. The peptide compounding landscape shifted in 2026 — read our breakdown: The 2026 FDA Peptide Reclassification, Explained.
Each vendor below is scored on purity, third-party COAs, shipping, and reputation. Prices are starting points and change often. Every link is an affiliate link and is disclosed.
| Vendor | From | Purity | 3rd-party COA | Shipping | |
|---|---|---|---|---|---|
| ZestyRat ResearchTop pick | $— | 99%+ | ✓ Every batch | US domestic | View & buy |
| Ascension PeptidesMost trusted | See site | 99.4% | ✓ Triple-verified | US · UPS | Buy → |
| Vendor C | $— | 99%+ | ✓ On request | US domestic | View & buy |
Vendor rows and pricing populate as affiliate partnerships are approved. Products listed are for laboratory and research purposes only — not for human consumption.
'Nootropic' is an informal label. Semax is studied in neurological research models; that describes a research area, not a proven human effect.
Look for batch-specific, third-party Certificates of Analysis (COAs), transparent purity testing, U.S. sourcing, and a real reputation across independent review platforms. Our vendor reviews check all of these.
No. We're an independent research and comparison resource. We link to vetted third-party vendors and disclose every affiliate relationship.
Last reviewed June 2026. By Shaun Tucker, B.A. Psychology, author of The Quiet Close.
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