Side-by-Side Comparison · 2026

P21 vs Synapsin

P21 vs Synapsin — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

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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Synapsin
Cognitive & Neurological

Synapsin is a proprietary intranasal peptide blend combining GHK-Cu (copper tripeptide for neuroregenerative and anti-inflammatory effects) and Dihexa (a potent HGF/c-Met agonist for synaptogenesis and memory). The combination targets synaptic density and cognitive performance fr...

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Key Parameters
Parameter P21 Synapsin
Category Cognitive & Neurological Cognitive & Neurological
Research Preclinical Vendor Blend
Half-Life - -
Typical Dose 100 µg/day -
Frequency Daily -
Route Subcutaneous / 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 P21 and Synapsin?
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... Synapsin: Synapsin is a proprietary intranasal peptide blend combining GHK-Cu (copper tripeptide for neuroregenerative and anti-inflammatory effects) and Dihexa (a potent HGF/c-Met agonist for synaptogenesis an...
Which has a longer half-life, P21 or Synapsin?
P21 half-life: unknown. Synapsin half-life: unknown.
Can you stack P21 and Synapsin?
P21 and Synapsin 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.