Side-by-Side Comparison · 2026

Cortexin vs P21

Cortexin vs P21 — 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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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 Cortexin P21
Category Cognitive & Neurological Cognitive & Neurological
Research Approved (Russia/CIS) Preclinical
Half-Life - -
Typical Dose 10 mg 100 µg/day
Frequency Once daily Daily
Route Intramuscular Subcutaneous / Intranasal
FDA Status Not Approved Not Approved

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Frequently Asked Questions
What is the difference between Cortexin and P21?
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... 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, Cortexin or P21?
Cortexin half-life: unknown. P21 half-life: unknown.
Can you stack Cortexin and P21?
Cortexin 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.