Head to head
Semax against N-Acetyl Semax Amidate
The Russian registered peptide and the modified version sold as longer lasting. No published study of the amidate form exists, so the parent's clinical literature cannot be assumed to transfer to it.
Column A
SemaxSemax (synthetic ACTH 4-10 analogue)
A synthetic heptapeptide approved in Russia for stroke and cognitive disorders, studied for BDNF-driven neuroprotection.
Column B
N-Acetyl Semax AmidateN-Acetyl Semax Amidate (NASA)
A terminally modified analog of Semax sold as a more stable, longer-acting nasal spray; no published study of the amidate form exists, so its parent's Russian literature cannot be assumed to transfer.
Side by side, on the facts we can check
| Attribute | Semax | N-Acetyl Semax Amidate |
|---|---|---|
| Category | Nootropic & CNS | Nootropic & CNS |
| FDA status | Not FDA-approved (approved in Russia and Ukraine). PCAC voted to recommend for compounding (July 2026); awaiting FDA rulemaking | Not approved |
| Half-life | Short (minutes); intranasal use | Not established |
| Molecular weight | 813.9 Da | About 854.9 Da (Semax is 813.9 Da; the analog adds an N-acetyl group and amidates the C-terminus) |
| Mechanism | Increases BDNF and NGF expression and modulates the melanocortin and dopaminergic systems, supporting neuroprotection and synaptic plasticity. | Presumed same as Semax: melanocortin-derived modulation of BDNF and monoamine systems. |
| Human studies cited | 1 | 1 |
| Legal status, US | Not approved; research use only | Not approved; sold 'for research use only' |
Frequently asked questions
What is the difference between Semax and N-Acetyl Semax Amidate?
Semax: A synthetic heptapeptide approved in Russia for stroke and cognitive disorders, studied for BDNF-driven neuroprotection. N-Acetyl Semax Amidate: A terminally modified analog of Semax sold as a more stable, longer-acting nasal spray; no published study of the amidate form exists, so its parent's Russian literature cannot be assumed to transfer.
Which has stronger research evidence, Semax or N-Acetyl Semax Amidate?
This database does not grade compounds. It counts what was run in people: 1 of the 4 studies cited on the Semax profile were human work, against 1 of 2 for N-Acetyl Semax Amidate. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Semax and N-Acetyl Semax Amidate FDA-approved?
Semax: Not FDA-approved (approved in Russia and Ukraine). PCAC voted to recommend for compounding (July 2026); awaiting FDA rulemaking. N-Acetyl Semax Amidate: Not approved.
Related posts
Blog articles that cover Semax or N-Acetyl Semax Amidate, newest first.
- Research / Sep 8, 2026 / 9 minPeptides for Sleep: DSIP, Epitalon and Pinealon Against the Evidence
- Safety / Sep 8, 2026 / 9 minPeptide Side Effects by Class: What Is Documented, What Is Anecdotal
- Regulation / Sep 8, 2026 / 9 minFDA Peptide Status in 2026: The Category 2 Removals, the July Votes, and What Actually Changed
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.