Side by side
N-Acetyl Semax Amidate vs Selank
Both are discussed for cognition & mood. What this site records about each, side by side. Every figure is on the compound's own page with the source it came from.
| N-Acetyl Semax Amidate | Selank | |
|---|---|---|
| What it is | Semax with both ends chemically capped so it lasts longer. More potent per milligram in animal work, and no human trial of the modified version exists. | A seven-amino-acid peptide developed in Russia and used there for anxiety. Nasal rather than injected, and the sibling compound to Semax. |
| EvidenceHow much human evidence exists, not how well it works. | Preclinical | Approved for another indication |
| Regulatory statusReviewed 2026-08-18 | Not approved anywhere. Semax itself is registered in Russia; this modified version is not, and has never been through a human trial. Sold only as a research chemical. | Approved and used clinically in Russia as an anxiolytic. Not approved in the United States, the EU or the UK, where material sold under this name is an unapproved substance with no manufacturing standard behind it. |
| Routes | Nasal, Subcutaneous | Nasal |
| Half-life | Not recorded | 0.5 hours |
| Cheapest per mgVials only, read from vendors' own listings and dated on the price index. | $3.25/mg | $1.20/mg |
| Median per mg | $3.50/mg | $4.07/mg |
| Vendors with a price | 4 | 46 |
| Storage once mixed | Refrigerated at 2–8 °C. Nasal solutions are handled more than injectables and are correspondingly easier to contaminate. | Refrigerated at 2–8 °C. A nasal solution is entered repeatedly over weeks, so bacteriostatic rather than sterile water matters here. |
Compare two other compounds · The full price index
This page is educational. It describes what published research reports, not what you should do. Peptides discussed here are largely not approved for human use, and nothing on BioAlmanac is medical advice. Nothing here ranks these two against each other. A table can show that one has more human evidence behind it or costs less per milligram; neither of those is a recommendation, and the right comparison for any person is one their doctor makes with them.