N-Acetyl Semax
NA-Semax — Acetylated Semax Analog
What is N-Acetyl Semax?
N-Acetyl Semax (NA-Semax) is a modified version of Semax with an N-acetyl group added to the N-terminus. This modification increases resistance to enzymatic degradation, extending the active half-life and potentially enhancing CNS penetration. NA-Semax is considered by many community users to have a longer duration of action and slightly different receptor binding profile than standard Semax.
NA-Semax retains Semax's mechanism — BDNF/NGF upregulation, dopaminergic and serotonergic modulation, and anti-inflammatory CNS activity — while the acetylation provides enhanced stability against aminopeptidases. The acetyl group also changes the peptide's interaction with the lipid bilayer, potentially improving neuronal membrane penetration and CNS bioavailability via the intranasal route.
Research Evidence
The N-acetyl modification is chemically established to reduce aminopeptidase degradation. Community reports suggest longer and smoother effects compared to standard Semax, consistent with the stability hypothesis.
Community use reports are consistent with Semax but with longer duration. The base mechanism (BDNF upregulation) applies — controlled trial data specific to NA-Semax is not available.
Evidence grades: Gold = RCT human data · Silver = consistent animal/human data · Bronze = limited or preliminary
Dosing Protocols
Reconstitution / Preparation
| Vial | Diluent | Concentration | Draw |
|---|---|---|---|
| 5 mg | 5 ml | 1 mg/ml | 300mcg = 30 units |
| 10 mg | 10 ml | 1 mg/ml | 300mcg = 30 units |
Frequently Asked Questions
Is NA-Semax better than standard Semax?
Not definitively — they have the same core mechanism but different pharmacokinetics. NA-Semax is reported to have a longer and smoother effect due to greater enzymatic stability. Whether this translates to greater cognitive benefit is individual. Some users prefer the more acute effect of standard Semax; others prefer the longer duration of NA-Semax.
Can NA-Semax and NA-Selank be combined?
Yes. NA-Semax (activating, focus-enhancing) and NA-Selank (anxiolytic, calming) are frequently combined in the same protocol. The NA versions of both may have more compatible and longer-lasting effect profiles than the standard versions.
References
- [1]Dolotov OV, Karpenko EA, Inozemtseva LS, et al. Semax, an analog of ACTH(4-7) with cognitive effects, regulates BDNF and trkB expression in the rat hippocampus. Brain Res. 2006;1117(1):54-60.
This profile was prepared using AI-assisted research synthesis. Citations are provided where applicable — verify with primary sources before clinical application.
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