P21 is a research compound. It is not approved by the FDA or any regulatory body for human use. This article is for educational and informational purposes only. Nothing here constitutes medical advice. Consult a qualified physician before considering any peptide use.
P21 (P21 (CNTF-derived peptide)) is a Neurotrophic peptide, CNTF mimetic. Synthetic peptide derived from ciliary neurotrophic factor (CNTF) designed to promote neurogenesis. It is researched for hippocampal neurogenesis, cognitive enhancement, memory improvement, potential Alzheimer's mitigation, neuroplasticity. Common dosages range from 500 mcg-4 mg daily administered once daily.
What Is P21?
P21 (P21 (CNTF-derived peptide)) is a Neurotrophic peptide, CNTF mimetic. Synthetic peptide derived from ciliary neurotrophic factor (CNTF) designed to promote neurogenesis. Also known as P21 peptide, neurogenic peptide, it has been studied for its potential effects on hippocampal neurogenesis, cognitive enhancement, memory improvement, potential Alzheimer's mitigation, neuroplasticity.
One of the few peptides specifically designed to grow new neurons in the hippocampus — targeting neurogenesis rather than neuroprotection, which is a fundamentally different approach to cognitive decline. In the research community, P21 has gained attention for its distinctive profile.
How Does P21 Work?
Mimics CNTF's neurogenic activity by promoting hippocampal neurogenesis and enhancing synaptic plasticity. Inhibits leukemia inhibitory factor (LIF) signaling to reduce astrogliosis. Promotes differentiation of neural stem cells into mature neurons in the hippocampal dentate gyrus.
This multi-pathway activity helps explain why P21 shows potential across several different applications.
What Does the Research Say About P21?
Preclinical research demonstrates enhanced neurogenesis and cognitive improvement in rodent models. Effective in Alzheimer's disease models. No human clinical trials completed.
Researchers should consult the latest peer-reviewed literature for the most current findings.
What Is the Recommended P21 Dosage?
Standard P21 dosing: 500 mcg-4 mg daily, administered once daily via subcutaneous injection, intranasal (experimental).
Half-life: 14-23 hours depending on formulation. Cycle length: 4-6 weeks.
Use our peptide dosing calculator for exact reconstitution ratios.
Calculate Your P21 Dose
Use our free peptide dosing calculator to get exact reconstitution math and syringe units for P21.
Open Calculator →What Are the Side Effects of P21?
Minimal toxicity in preclinical studies. Human safety data extremely limited. Local injection site reactions possible.
P21 is not fda-approved. investigational research-only peptide.
Can You Stack P21 With Other Peptides?
Complements Dihexa (synaptogenesis) and Semax (BDNF) for comprehensive cognitive/neurogenic enhancement through different neurotrophic pathways.
What Is the Bottom Line on P21?
P21 is a Neurotrophic peptide, CNTF mimetic researched for hippocampal neurogenesis, cognitive enhancement, memory improvement, potential Alzheimer's mitigation, neuroplasticity. Standard protocols use 500 mcg-4 mg daily once daily for 4-6 weeks.
Source from COA-tested vendors. Read our beginner's guide for more, or use the dosing calculator to plan your protocol.
Complete Guide
P21 : Benefits, Dosage, Side Effects & Research
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Research-Grade Sourcing
If you're going to research P21, source matters. These are the suppliers WolveStack has vetted for purity and third-party testing.
Frequently Asked Questions
What is P21?
P21 (P21 (CNTF-derived peptide)) is a Neurotrophic peptide, CNTF mimetic. Synthetic peptide derived from ciliary neurotrophic factor (CNTF) designed to promote neurogenesis. It is researched for hippocampal neurogenesis, cognitive enhancement, memory improvement, potential Alzheimer's mitigation, neuroplasticity.
What is the recommended P21 dosage?
Common dosages: 500 mcg-4 mg daily administered once daily via subcutaneous injection, intranasal (experimental). Cycle length: 4-6 weeks. Half-life: 14-23 hours depending on formulation. Use our peptide calculator for exact reconstitution math.
What are the side effects of P21?
Minimal toxicity in preclinical studies. Human safety data extremely limited. Local injection site reactions possible.
Is P21 safe?
P21 has shown a preliminary safety profile in research. Not FDA-approved. Investigational research-only peptide. All research should follow appropriate safety protocols.