Library / Neuro / sleep / P21
CNTF-derived nootropic peptide
P21
Cited range Preclinical
ClassCiliary neurotrophic factor fragment analog
ThemesNeurogenesis / AD-model papers
EvidenceAnimal-first
What it is
P21 is a short peptide derived from ciliary neurotrophic factor research, studied for neuronal plasticity in Alzheimer’s-like animal models.
Benefits in plain language
What researchers and reference users usually mean when they talk about this compound. These are study themes and common claims — not a promise that it will do this in you.
- A nootropic peptide related to CNTF signaling, talked about for memory and neurogenesis in animal work.
- People file it next to Semax/Dihexa as “brain repair / learning” research.
- Human playbook is thin.
If a branded, FDA-approved product exists, that label is the only dose that is actually authorized. Research-chemical vials are a different object.
Mechanism of action
CNTF-pathway and dentate-gyrus neurogenesis stories in rodents. Not a mapped human nootropic dose.
Possible side effects / caveats
Unknown human AE profile. Growth-factor-adjacent peptides deserve the same conservatism as Dihexa.
Protocol ranges
| Source tier | Amount | Frequency / duration | Notes |
|---|---|---|---|
| Cited talk | mcg IN/SC figures | Daily in forum tables | No accepted human protocol |