Side-by-Side Comparison · 2026

Adamax vs P21

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

Adamax
Cognitive & Neurological

Adamax is a branded formulation of N-Acetyl Semax Amidate, the most potent and longest-acting analog of the nootropic peptide Semax. The N-acetyl modification at the N-terminus and amide modification at the C-terminus together extend its half-life and increase BDNF-stimulating po...

Calculate Adamax dose →
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...

Calculate P21 dose →
Key Parameters
Parameter Adamax P21
Category Cognitive & Neurological Cognitive & Neurological
Research Research Use Preclinical
Half-Life ~8–12 hours (extended vs. standard Semax) -
Typical Dose 100–300 µg 100 µg/day
Frequency Once or twice daily Daily
Route Intranasal Subcutaneous / Intranasal
FDA Status Not Approved Not Approved

Calculate doses for both

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

Calculate Adamax Calculate P21
Frequently Asked Questions
What is the difference between Adamax and P21?
Adamax: Adamax is a branded formulation of N-Acetyl Semax Amidate, the most potent and longest-acting analog of the nootropic peptide Semax. The N-acetyl modification at the N-terminus and amide modification ... 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, Adamax or P21?
Adamax half-life: ~8–12 hours (extended vs. standard Semax). P21 half-life: unknown.
Can you stack Adamax and P21?
Adamax 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.