Cognitive ⏱ Half-life: Extended compared to standard Semax. Approved Abroad

N-Acetyl Semax

N-Acetyl Semax Amidate

Updated March 15, 2026

Evidence at a Glance

Regulatory statusApproved Abroad
Parent Semax is on Russia's Vital & Essential Medicines list; the N-acetyl amidate variant itself has no independent approval or trials.
Human evidenceAnecdotal only
Animal evidenceLimited

Parent Semax has Russian clinical use for stroke and cognitive disorders, but this acetylated/amidated variant has no clinical trials of its own and is sold only as a research chemical in Western markets.

What the research does not support

  • It is not FDA-approved and is not a proven cognitive enhancer in healthy adults.
  • The acetyl-amidate form has no human trials of its own; any benefits are extrapolated from the parent Semax molecule.
  • Russia's approvals cover acute stroke and organic brain conditions, not general 'nootropic' or 'smart drug' use.
  • It lacks the large Western randomized controlled trials that support established medicines.
Half-Life
Extended compared to standard Semax.
Mol. Weight
~855 g/mol

What is N-Acetyl Semax?

N-Acetyl Semax Amidate is the stability-optimized version of the nootropic neuropeptide Semax, featuring dual modifications that significantly extend its biological activity and improve CNS penetration.

Research Applications

Same as Semax — neuroprotection, BDNF expression, cognitive enhancement, and attention research — with enhanced pharmacokinetics.

Dosage Information (Research Use)

Research protocols: 200-600 mcg/day intranasally or subcutaneously. Research use only.

Reconstitution & Handling

Standard BAC water reconstitution.

Half-Life & Pharmacokinetics

Extended compared to standard Semax.

Reported Observations in Literature

Same minimal profile as standard Semax.

Key Research References

  • See Semax references.

How N-Acetyl Semax Works

N-Acetyl Semax Amidate adds acetyl and amide modifications to standard Semax for enhanced enzymatic stability. Core mechanisms remain: BDNF/NGF/GDNF upregulation, dopaminergic and serotonergic modulation, and neuroprotective signaling — all with improved bioavailability.

Research Findings

Considered the most potent form of Semax available for research. Enhanced stability is particularly beneficial for intranasal administration.

Dosage & Administration

Research protocols: 200-600 mcg/day intranasally or subcutaneously. Research use only.

Safety & Side Effects

Same minimal profile as standard Semax.

Important: All safety information is derived from published research, primarily animal studies. No controlled human clinical trial data exists unless explicitly noted. This compound is sold for research purposes only.

Quick Facts

Sequence Ac-Met-Glu-His-Phe-Pro-Gly-Pro-NH2
Molecular Weight ~855 g/mol
Half-Life Extended compared to standard Semax.
Available Sizes 5mg
Storage Lyophilized: -20°C. Reconstituted: 2-8°C.

Key Research References

  • See Semax references.

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