Side-by-Side Comparison · 2026

N-Acetyl Semax vs Neuroxelin

N-Acetyl Semax vs Neuroxelin — 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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Neuroxelin
Cognitive & Neurological

Neuroxelin is a vendor nootropic peptide blend containing PE-22-28 (10 mg), Pinealon (10 mg), N-Acetyl Semax (20 mg), and N-Acetyl Selank (8 mg), formulated for intranasal administration. It combines four cognitively-active peptides targeting different aspects of brain performanc...

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

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Use ASCEND's free reconstitution calculator to get exact syringe draw amounts for your vial.

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Frequently Asked Questions
What is the difference between N-Acetyl Semax and Neuroxelin?
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... Neuroxelin: Neuroxelin is a vendor nootropic peptide blend containing PE-22-28 (10 mg), Pinealon (10 mg), N-Acetyl Semax (20 mg), and N-Acetyl Selank (8 mg), formulated for intranasal administration. It combines ...
Which has a longer half-life, N-Acetyl Semax or Neuroxelin?
N-Acetyl Semax half-life: ~4–6 hours (extended vs. standard Semax). Neuroxelin half-life: unknown.
Can you stack N-Acetyl Semax and Neuroxelin?
N-Acetyl Semax and Neuroxelin 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.