Side-by-Side Comparison · 2026

N-Acetyl Semax vs Semax Amidate

N-Acetyl Semax vs Semax Amidate — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

N-Acetyl Semax
Cognitive & Neurological

N-Acetyl Semax is a modified form of Semax (the Russian-approved nootropic peptide based on ACTH(4-7)) with N-terminal acetylation added for improved enzymatic stability. The acetyl group protects against aminopeptidase degradation in nasal tissue, extending effective half-life a...

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Semax Amidate
Cognitive & Neurological

Semax Amidate (Semax-NH2) is Semax with C-terminal amidation - the addition of an amide group (-NH2) replacing the C-terminal carboxyl group (-COOH). This modification protects against carboxypeptidase degradation in nasal tissue, extending half-life and improving CNS bioavailabi...

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Key Parameters
Parameter N-Acetyl Semax Semax Amidate
Category Cognitive & Neurological Cognitive & Neurological
Research Research Use Research Use
Half-Life ~4–6 hours (extended vs. standard Semax) ~6 hours (estimated)
Typical Dose 100–400 µg 100–400 µg
Frequency Once or twice daily Once or twice daily
Route Intranasal Intranasal
FDA Status Not Approved Not Approved

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Frequently Asked Questions
What is the difference between N-Acetyl Semax and Semax Amidate?
N-Acetyl Semax: N-Acetyl Semax is a modified form of Semax (the Russian-approved nootropic peptide based on ACTH(4-7)) with N-terminal acetylation added for improved enzymatic stability. The acetyl group protects aga... Semax Amidate: Semax Amidate (Semax-NH2) is Semax with C-terminal amidation - the addition of an amide group (-NH2) replacing the C-terminal carboxyl group (-COOH). This modification protects against carboxypeptidas...
Which has a longer half-life, N-Acetyl Semax or Semax Amidate?
N-Acetyl Semax half-life: ~4–6 hours (extended vs. standard Semax). Semax Amidate half-life: ~6 hours (estimated).
Can you stack N-Acetyl Semax and Semax Amidate?
N-Acetyl Semax and Semax Amidate are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.