P21 Dosage Chart & Schedule
P21 (P021) is a small peptidergic compound derived from an active region of ciliary neurotrophic factor (CNTF), chemically modified (adamantylation) for stability and brain penetration. In preclinical models it is reported to enhance neurogenesis and BDNF signaling and to reduce tau pathology. It is preclinical/research-only.
P21 has no human dosing data. In rodent models it is given orally (including in the diet) or by injection at milligram-per-kilogram levels; research-community use describes microgram-level subcutaneous or intranasal amounts, but no validated human protocol exists. It is preclinical/research-only.
Figures describe how P21 is reported in the research literature and research-community references — not a recommendation for human use. For laboratory research only.
Dosage protocols
Commonly referenced research tiers. Start conservative; every compound and study context differs.
- Frequency
- Anecdotally once daily
- Weekly total
- Not established
- Cycle
- Not established
Human dosing does not exist; animal studies use mg/kg oral or injected amounts that do not translate to a validated human dose.
CNTF-derived neurogenic peptide, preclinical only
- P21 is a chemically modified (adamantylated) mimetic of a ciliary neurotrophic factor region, reported to promote hippocampal neurogenesis and BDNF signaling and to reduce tau pathology in rodents.
- Human pharmacokinetics are unpublished; it was designed for oral and blood-brain-barrier penetration in animal studies.
Ready to run this protocol?
Dosing is only as good as the vial. Research-grade peptides are third-party tested with published COAs from our top-rated source — reconstitute with confidence and skip the guesswork on identity and purity.
Weekly schedule
A typical week on the research reference only protocol (Anecdotally once daily).
Dosing day Off
From vial to injection in 6 steps
Wipe both vial tops
Swab the peptide vial and the bacteriostatic-water vial with fresh alcohol and let them dry.
Draw the water
Pull the planned amount of bacteriostatic water (per your mix) into the syringe.
Add it slowly
Run the water down the inside wall of the vial — don't blast the powder. Swirl gently; never shake.
Let it dissolve
Wait until the solution is fully clear, then refrigerate the vial.
Draw your dose
Pull the calculated units on a U-100 insulin syringe.
Store between uses
Keep the reconstituted vial refrigerated and use within its stable window.
Handling & storage
- P21 is a small modified peptide studied mostly by oral/dietary and injectable routes in animals; in humans it is not a standard water-reconstituted U-100 injectable.
- Research handling follows the compound's solubility rather than a fixed bacteriostatic-water mix.
- No validated human dose or safety data exists.
- Preclinical/research-only; not approved.
P21 dosing FAQ
Is there a human dose for P21?
No. Human dosing does not exist. Rodent studies use milligram-per-kilogram oral or injected amounts, and community use describes microgram-level subcutaneous or intranasal dosing, but none of it is validated in humans.
Is P21 the same as the p21 protein?
No. This P21 (also written P021) is a CNTF-derived neurogenic peptide compound, not the cell-cycle protein p21; the shared label causes confusion.
How is P21 administered?
Animal studies use oral/dietary and injectable routes; research-community use is usually described as subcutaneous or intranasal, but no route has a validated human protocol.
Is P21 related to dihexa?
It sits in the same neurotrophic research space and is often discussed alongside compounds like dihexa, but P21 is its own CNTF-derived compound with no established human dosing.
Sources
Categories: Nootropic & Cognitive · Status: Research use only. This page is educational and for laboratory research use only; it is not medical advice.