Side-by-Side Comparison · 2026

Cortexin vs N-Acetyl Semax

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

Cortexin
Cognitive & Neurological

Cortexin is a polypeptide complex extracted from the cerebral cortex of pigs (porcine origin) that contains a mixture of low-molecular-weight neuropeptides, amino acids, and protein fractions. It is an approved drug in Russia, used clinically for stroke recovery, traumatic brain ...

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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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Key Parameters
Parameter Cortexin N-Acetyl Semax
Category Cognitive & Neurological Cognitive & Neurological
Research Approved (Russia/CIS) Research Use
Half-Life - ~4–6 hours (extended vs. standard Semax)
Typical Dose 10 mg 100–400 µg
Frequency Once daily Once or twice daily
Route Intramuscular Intranasal
FDA Status Not Approved Not Approved

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Frequently Asked Questions
What is the difference between Cortexin and N-Acetyl Semax?
Cortexin: Cortexin is a polypeptide complex extracted from the cerebral cortex of pigs (porcine origin) that contains a mixture of low-molecular-weight neuropeptides, amino acids, and protein fractions. It is a... 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...
Which has a longer half-life, Cortexin or N-Acetyl Semax?
Cortexin half-life: unknown. N-Acetyl Semax half-life: ~4–6 hours (extended vs. standard Semax).
Can you stack Cortexin and N-Acetyl Semax?
Cortexin and N-Acetyl Semax 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.