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 is typically reconstituted with bacteriostatic water (BAC water). The standard dosage of 500 mcg-4 mg daily is administered once daily via subcutaneous injection, intranasal (experimental). Use our peptide calculator for exact mixing ratios.
How Do You Reconstitute P21?
P21 is supplied as a lyophilized (freeze-dried) powder that must be reconstituted before use. Proper reconstitution is critical for accurate dosing and maintaining stability.
This guide covers the step-by-step process for mixing P21 with bacteriostatic water to achieve your target concentration.
What Supplies Do You Need?
To reconstitute P21, you need: the P21 vial (lyophilized powder), bacteriostatic water (BAC water with 0.9% benzyl alcohol), insulin syringes (typically 1mL/100-unit), alcohol swabs, and a clean workspace.
Important: Always use bacteriostatic water — not sterile water or saline. BAC water's benzyl alcohol prevents bacterial contamination, extending the usable life of reconstituted P21 to 4-6 weeks.
Step-by-Step P21 Reconstitution
Step 1: Clean the vial tops of both the P21 and BAC water with alcohol swabs.
Step 2: Draw the calculated amount of BAC water into an insulin syringe. Use our peptide calculator to determine the exact amount.
Step 3: Insert the needle into the P21 vial at an angle, and let the water run down the side of the glass — never spray directly onto the powder as this can damage the peptide bonds.
Step 4: Gently swirl (do not shake) the vial until the powder is fully dissolved. The solution should be clear.
Step 5: Label the vial with the date and concentration. Store at 2-8°C.
Calculate Your P21 Dose
Use our free peptide dosing calculator to get exact reconstitution math and syringe units for P21.
Open Calculator →How Do You Dose Reconstituted P21?
After reconstitution, the standard P21 dose is 500 mcg-4 mg daily administered once daily via subcutaneous injection, intranasal (experimental). The number of units on your insulin syringe depends on how much BAC water you added.
Our calculator will tell you exactly how many units to draw for your dose based on your specific reconstitution ratio.
How Do You Store Reconstituted P21?
Store reconstituted P21 at 2-8°C (standard refrigerator temperature). Use within 4-6 weeks. Keep away from light and temperature fluctuations.
Unreconstituted P21 powder can be stored at -20°C for 12+ months. Once you reconstitute it, the clock starts.
Bottom Line
Reconstituting P21 is straightforward — add BAC water, swirl gently, refrigerate. The key is using the right amount of water for accurate dosing. Use our peptide calculator every time.
Complete Guide
P21 : Benefits, Dosage, Side Effects & Research
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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.