Side-by-Side Comparison · 2026

N-Acetyl Selank Amidate vs P21

N-Acetyl Selank Amidate vs P21 — 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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P21
Cognitive & Neurological

P21 is a synthetic peptide derived from ciliary neurotrophic factor (CNTF), designed to promote neurogenesis - the formation of new neurons - in the hippocampus and olfactory bulb. CNTF is a potent neurotrophic factor but has poor CNS penetration and causes significant systemic s...

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Key Parameters
Parameter N-Acetyl Selank Amidate P21
Category Cognitive & Neurological Cognitive & Neurological
Research Research Use Preclinical
Half-Life ~6–8 hours (estimated; extended vs. standard Selank) -
Typical Dose 100–300 µg 100 µg/day
Frequency Once or twice daily Daily
Route Intranasal Subcutaneous / Intranasal
FDA Status Not Approved Not Approved

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Frequently Asked Questions
What is the difference between N-Acetyl Selank Amidate and P21?
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... P21: P21 is a synthetic peptide derived from ciliary neurotrophic factor (CNTF), designed to promote neurogenesis - the formation of new neurons - in the hippocampus and olfactory bulb. CNTF is a potent ne...
Which has a longer half-life, N-Acetyl Selank Amidate or P21?
N-Acetyl Selank Amidate half-life: ~6–8 hours (estimated; extended vs. standard Selank). P21 half-life: unknown.
Can you stack N-Acetyl Selank Amidate and P21?
N-Acetyl Selank Amidate and P21 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.