Side-by-Side Comparison · 2026

N-Acetyl Selank Amidate vs N-Acetyl Semax

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

N-Acetyl Selank Amidate
Cognitive & Neurological

N-Acetyl Selank Amidate is a doubly-modified form of Selank (a synthetic heptapeptide based on tuftsin) with N-acetylation at the N-terminus and amidation at the C-terminus. These modifications extend enzymatic stability and CNS bioavailability, making it the highest-potency form...

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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 N-Acetyl Selank Amidate N-Acetyl Semax
Category Cognitive & Neurological Cognitive & Neurological
Research Research Use Research Use
Half-Life ~6–8 hours (estimated; extended vs. standard Selank) ~4–6 hours (extended vs. standard Semax)
Typical Dose 100–300 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 Selank Amidate and N-Acetyl Semax?
N-Acetyl Selank Amidate: N-Acetyl Selank Amidate is a doubly-modified form of Selank (a synthetic heptapeptide based on tuftsin) with N-acetylation at the N-terminus and amidation at the C-terminus. These modifications extend... 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, N-Acetyl Selank Amidate or N-Acetyl Semax?
N-Acetyl Selank Amidate half-life: ~6–8 hours (estimated; extended vs. standard Selank). N-Acetyl Semax half-life: ~4–6 hours (extended vs. standard Semax).
Can you stack N-Acetyl Selank Amidate and N-Acetyl Semax?
N-Acetyl Selank Amidate 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.