Overview
P21 (P021) is a synthetic tetrapeptide mimetic derived from the active epitope of Ciliary Neurotrophic Factor (CNTF), engineered for direct brain repair.
What problem it targets: It targets age-related memory loss, cognitive decline, neurodegenerative diseases (such as Alzheimer's), brain fog, and impaired mental neuroplasticity.
What It Does
• Drives adult neurogenesis: Penetrates the blood-brain barrier to stimulate the birth of new neurons in the subgranular zone of the hippocampal dentate gyrus.
• Elevates BDNF levels: Upregulates Brain-Derived Neurotrophic Factor, facilitating synaptic plasticity, dendritic branching, and long-term memory encoding.
• Prevents pathological tau hyperphosphorylation: Blocks abnormal tau protein aggregation and reduces neurotoxic enzymes in experimental neurodegenerative models.
• Realistic expectations: Most commonly administered via intranasal spray to access the brain directly. Effects on memory recall, processing speed, and mental stamina build cumulatively over 4 to 8 weeks.
Reconstitution
| Vial size | BAC water / Solvent | Concentration |
|---|---|---|
| 5 mg | + 2.5 mL | 2 mg/mL |
Protocol
| Phase | Frequency | Dose | Units (2 mg/mL) | Notes |
|---|---|---|---|---|
| Weeks 1–6 | Daily | 250–500 mcg SubQ or 500 mcg–1 mg intranasal | 12.5–25u (SubQ) | Intranasal is the common route. Effects are cumulative. |
| Off | 2–4 weeks | – | – | Cycle 4–8 weeks on / 2–4 weeks off. Caution: no completed human trials, doses are user/animal-derived. Timing: daytime; neurogenic effects build over weeks, do not expect immediate changes. Route: intranasal gives direct nose-to-brain delivery; SubQ also used. By sex: Unisex experimental neurogenic peptide, animal data only, no sex-specific dosing. Avoid in pregnancy. |
Handling & Stacking
- Freeze-dried: -4°F.
- Reconstituted: 36–46°F.
- Best used within ~3–4 weeks, kept cold (community estimate, no published data); that is close to the 28-day sterility limit, so use whichever comes first.
- Gradual memory/cognitive support over weeks if effective; cumulative.
- Strongest rationale is in age-related cognitive decline (animal models).
- Supply math 5mg → 2 vials (6-wk @ 250 mcg/day SubQ; more if intranasal mg-dosing)
