What P21 is
P21 is ciliary neurotrophic peptide fragment. neurogenesis research. It sits within neuropeptide research (attention, memory, stress resilience). Pepture keeps P21 in the library as a tracking target only, the app records what you enter but makes no recommendation about whether the compound is appropriate for you. That decision belongs with a licensed clinician.
Published pharmacokinetic data places the half-life of P21 at roughly 3 hours, and doses recorded in the community cluster around the 100 mcg to 500 mcg range. Individual protocols vary widely. Jurisdictional status (FDA-approved, prescription, or research only) depends on the specific formulation and country.
How people track P21
In Pepture, P21 is typically logged alongside focus and mood ratings, sleep depth, work-session output, so cycle impact can be reviewed at the end of a block rather than by memory. The app captures dose, site, reconstitution ratio, cycle day, and any subjective rating you choose to add.
If you are considering P21 but have not started, or if you have started and want a second opinion, speak with a licensed clinician before changing any dose or cycle pattern.
Reconstitution math
Open the pre-filled P21 reconstitution calculator to compute syringe units per dose.
Reported Side Effects of P21
Effects below are summarised from peer-reviewed literature or regulatory labeling where it exists. Not medical advice. Individual responses vary.
Used in these Pepture routines
P21 appears in the following Pepture stack templates. Tap to load the full routine.
Compare P21
How P21 stacks up against the peers most users consider.