NA Semax Amidate (N-Acetyl Semax Amidate): Research, Mechanism & Current Evidence

What is NA Semax Amidate?

NA-Semax Amidate is Semax with two chemical modifications: an acetyl group added at one end and an amide group at the other. Both changes are intended to slow the rate at which enzymes break the peptide down.

It is important to be clear that this is a different molecule from Semax, and the research on Semax does not automatically apply to it.

What is NA Semax Amidate researched for?

The same areas as Semax — cognition, attention and neuroprotection — but with far fewer published studies specific to the modified form.

• Rapid improvement in sustained attention, working memory, and mental clarity within 15-30 minutes.
• Enhances both short-term and long-term memory consolidation through BDNF upregulation.
• Significant improvement in cognitive performance during mental fatigue, with lasting effects.
• Accelerates functional recovery through enhanced neuroplasticity and BDNF elevation.
• Protects against neural oxidative damage and supports cellular repair mechanisms.
• Rapidly increases BDNF and TrkB receptor expression, supporting neuronal survival.
• Improves episodic memory formation and recall through default mode network optimization.
• Enhances acquisition of new information through improved synaptic plasticity.

How does NA Semax Amidate work?

Acetylation and amidation are standard medicinal chemistry techniques for protecting a peptide's exposed ends from the enzymes that trim peptides from either terminus. The result is a longer-lasting molecule.

The underlying activity is expected to resemble Semax, working through BDNF and related neurotrophic signalling, but this has not been separately characterised in depth.

Reported targets: TrkB

What does the research show?

Most claims made for this variant rest on the Semax literature rather than on studies of the amidated form.

Where comparative data exists it concerns stability and pharmacokinetics rather than clinical outcomes.

Limitations of the current evidence

Greater stability is a chemical property, not a demonstrated clinical advantage. No trial has compared the two forms on cognitive outcomes.

The distinction between this compound and Semax is routinely blurred in vendor descriptions.

References

1. A Nootropic Adrenocorticotropin Analog 4-10 Semax: 15 Years Experience in Its Design and Study (Parent Compound) Ashmarin IP, Nezavibatko VN, Levitskaya NG, et al. Zhurnal Vysshei Nervnoi Deiatelnosti imeni I.P. Pavlova

   1997

   Foundational Semax review: intranasal doses of 0.015-0.050 mg/kg stimulate operative memory and attention for 20-24 hours. NA-Semax-Amidate modifications extend half-life and enhance bioavailability.

2. Effects of Semax on the Default Mode Network of the Brain

   Lebedeva IS, Panikratova YR, Sokolov OY, et al. · Bulletin of experimental biology and medicine · 2018

   24 healthy volunteers; resting-state fMRI showed increased default mode network volume in medial frontal cortex after intranasal 1% Semax vs placebo, enhancing episodic memory.

   Early human study · PMID 30225715

3. The Efficacy of Semax in the Treatment of Patients at Different Stages of Ischemic Stroke (Parent Compound) Gusev EI, Barskov IV, et al. Zhurnal Nevrologii i Psikhiatrii imeni S.S. Korsakova

   2018

   110 ischemic stroke patients; Semax (6000 mcg/day intranasal) increased BDNF plasma levels and accelerated functional recovery during rehabilitation.

4. The Peptide Semax Affects the Expression of Genes Related to the Immune and Vascular Systems in Rat Brain Focal Ischemia (Parent Compound) Dergunova LV, Limborska SA, et al. BMC Genomics

   2014

   Genome-wide analysis of ischemized rat brain cortex: Semax modulated 24 vascular genes and enhanced immune-response gene expression including immunoglobulins and chemokines.

   Animal study

5. Semax, an Analog of ACTH(4-10), Regulates BDNF and trkB Expression in the Rat Hippocampus (Parent Compound)

   Dolotov OV, Karpenko EA, Inozemtseva LS, et al. · Brain Research · 2006

   Single application at 50 mcg/kg produced 1.4-fold increase in BDNF protein and 1.6-fold increase in trkB tyrosine phosphorylation in rat hippocampus.

   Animal study

6. [The efficacy of semax in the tretament of patients at different stages of ischemic stroke]

   Gusev EI, Martynov MY, Kostenko EV, et al. · Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova · 2018

   PMID 29798983

7. The peptide semax affects the expression of genes related to the immune and vascular systems in rat brain focal ischemia: genome-wide transcriptional analysis

   Medvedeva EV, Dmitrieva VG, Povarova OV, et al. · BMC genomics · 2014

   Animal study · PMID 24661604

8. Semax, an analog of ACTH(4-10) with cognitive effects, regulates BDNF and trkB expression in the rat hippocampus

   Dolotov OV, Karpenko EA, Inozemtseva LS, et al. · Brain research · 2006

   Animal study · PMID 16996037

9. [A nootropic adrenocorticotropin analog 4-10-semax (l5 years experience in its design and study)]

   Asmarin IP, Nezavibat'ko VN, Miasoedov NF, et al. · Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova · 1997

   PMID 9173745

Some statements on this page come from secondary summaries that we have not been able to trace to a primary source. Those are flagged here rather than presented as though they were fully referenced.

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