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ID: N-ACETYL-SEMAX-AMIDATE STATUS: ACTIVE

N-Acetyl Semax Amidate

Research Only

Also known as: NA-Semax, N-Acetyl Semax, Acetyl-Semax-Amidate, NASA-Semax

A chemically modified version of Semax with N-terminal acetylation and C-terminal amidation designed to enhance peptide stability. While parent Semax is approved in Russia for nootropic and neuroprotective applications, this specific modification has no independent clinical research.

Very Low Evidence 2 Sources

Research Statistics

Total Sources
2
Human Studies
0
Preclinical
2
Evidence Rating Very Low Evidence
Research Depth 1/5
Global Coverage 1/5
Mechanism Plausibility 2/5
Overall Score
1.5 /5

N-acetyl amidate modification of semax with no direct human studies; mechanism extrapolated from parent compound with no independent validation of this specific chemical modification.

Last reviewed February 2026 How we rate →
!!
Evidence Level
very low
Not approved for human use by any regulatory agency
Limited human clinical trial data
Consult a healthcare provider before use
Not FDA Approved WADA Prohibited

Research Dossier

01 / 7

Overview

What is N-Acetyl Semax Amidate and what does the research say?

Identity
Also Known As
NA-Semax • N-Acetyl Semax • Acetyl-Semax-Amidate • NASA-Semax
Type
Heptapeptide (modified)
Length
7 amino acids
Weight
~855 Da
Sequence
Ac-Met-Glu-His-Phe-Pro-Gly-Pro-NH2
Molecular Structure
Ac-M
E
H
F
P
G
P-NH2
Hydrophobic
Polar
Positive
Negative

Mechanism of Action

The proposed mechanisms of N-Acetyl Semax Amidate are extrapolated entirely from parent compound Semax research. No direct studies exist on this modified form.

How It Works (Simplified)

N-Acetyl Semax Amidate is proposed to work through the same pathways as Semax, with enhanced stability from terminal modifications:

1
Neurotrophic Enhancement

Parent Semax increases BDNF, NGF, and GDNF expression. Whether modifications preserve this activity is unknown.

2
Neurotransmitter Modulation

Semax affects dopamine and serotonin systems. The modified form’s receptor affinity has never been tested.

3
TrkB Receptor Signaling

Semax activates TrkB receptors for neuroplasticity. Impact of terminal modifications on binding is uncharacterized.

4
Enhanced Stability

N-acetylation blocks aminopeptidases, C-amidation blocks carboxypeptidases. Actual half-life extension not measured.

Scientific Pathways

Neurotrophic Pathway (Extrapolated from Semax)

NA-Semax-Amidate (theoretical) → Same as Semax? → BDNF/NGF upregulation → TrkB activation

                                                               Neuroplasticity & neuroprotection

Dopaminergic Modulation (Extrapolated from Semax)

NA-Semax-Amidate (theoretical) → Dopamine system → Enhanced cognition/motivation
                               → Serotonin system → Mood modulation

Key Research: Dmitrieva VG et al. (Russia, 2008) demonstrated BDNF expression effects with Semax. PMID:17706034

Important Limitations

  • Zero published studies on N-Acetyl Semax Amidate specifically
  • All mechanisms extrapolated from parent Semax research
  • Whether modifications preserve biological activity is untested
  • No human pharmacokinetic data exists for this compound

Evidence-Chained Benefits

Evidence-Chained Benefits

Research findings linked to mechanisms and clinical outcomes

Mechanism BDNF/TrkB pathway activation promoting neuroplasticity
Emerging 0 direct studies
Benefit may enhance cognitive function and memory
Evidence Level
Very Low
Mechanism Dopaminergic and serotonergic system modulation
Emerging 0 direct studies
Benefit may improve mood and motivation
Evidence Level
Very Low
Mechanism NGF/GDNF upregulation for neuroprotection
Emerging 0 direct studies
Benefit may provide neuroprotective effects
Evidence Level
Very Low
Mechanism N-acetylation and C-amidation for enhanced peptide stability
Emerging 0 direct studies
Benefit may extend duration of action compared to parent Semax
Evidence Level
Very Low
Mechanism Confidence
Established
Supported
Emerging
Evidence Level
High
Moderate
Low
Very Low

What to Expect

Timeline based on observations from published studies. Individual responses may vary.

No human data available. Based on parent Semax pharmacology: Acute cognitive effects may be noticed. Russian Semax studies suggest rapid onset of action. Whether modifications alter timeline is unknown.

Extrapolated from Semax: Neurotrophic factor expression changes may develop. Parent compound shows BDNF modulation in animal models within this timeframe. No data specific to NA-Semax-Amidate.

Based on general nootropic peptide research: Neuroplasticity effects may accumulate with continued use. No long-term studies exist for this modified compound.

Week 8+

Completely unknown. No studies have evaluated extended use of N-Acetyl Semax Amidate. Long-term safety and efficacy data do not exist.

Research-Based Observations

This timeline reflects observations from published clinical and preclinical studies. Individual responses may vary significantly. This is not a guarantee of effects or a dosing schedule. Consult qualified healthcare providers for personalized guidance.

Quality Checklist

Visual indicators to help evaluate N-Acetyl Semax Amidate product quality

Good Signs (6 indicators)
White to off-white lyophilized powder
Dissolves completely in bacteriostatic water
Clear, colorless solution after reconstitution
Certificate of analysis (COA) showing >98% purity
Third-party HPLC and mass spectrometry verification
Proper vacuum seal on vial
Warning Signs (5 indicators)
Slightly off-white or cream-colored powder
Takes longer than expected to dissolve
Powder appears collapsed or melted
COA from manufacturer only without third-party verification
Purity listed below 98% but above 95%
Bad Signs (6 indicators)
Yellow, brown, or otherwise discolored powder
Visible particles or cloudiness after reconstitution
Gel-like consistency or clumping that won't dissolve
No COA provided or COA appears fraudulent
Strong unusual odor
Vial seal appears compromised
Positive quality indicator
Requires evaluation
Potential quality issue

For Research Evaluation Only

These quality indicators are general guidelines based on typical peptide characteristics. Professional laboratory testing (HPLC, mass spectrometry) provides definitive quality verification. This checklist is for initial visual evaluation only.

Peptide Interactions

Known and theoretical interactions when combining N-Acetyl Semax Amidate with other peptides. Based on published research and mechanistic considerations.

Synergistic
Compatible
Caution
Avoid

Semax

Synergistic
Synergistic

Parent compound with identical core sequence. NA-Semax-Amidate is designed to extend duration of action through terminal modifications. No studies comparing direct combination.

Both are modified Russian nootropic peptides with different mechanisms (Semax: neurotrophic focus vs Selank: anxiolytic focus). Commonly discussed together but no interaction studies exist.

Different mechanism profiles. Selank focuses on anxiolytic effects while Semax derivatives target cognitive enhancement. No known contraindications.

Research Note: Interaction data is based on published literature, mechanistic understanding, and theoretical considerations. Most peptide combinations lack direct clinical study. This information is for educational purposes only and does not constitute medical advice. Always consult qualified healthcare providers.

References

Methodology Note

This dossier synthesizes available evidence from peer-reviewed literature, regulatory documents, and clinical trial registries. Evidence strength ratings follow a modified GRADE approach.

For complete methodology details, see our Methodology page.

Important Disclaimer

This dossier is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before making health decisions.

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