What does P21 do? Benefits and evidence

An experimental memory peptide with animal research and no established human dose or safety profile.

Also called: P021, P-21, Peptide 021, CNTF-derived P021.

Nootropic peptides · Adamantane-modified CNTF-derived peptide mimetic · Evidence: Animal studies only.

P21, also called P021, copies part of CNTF, a protein that supports nerve cells. Animal findings vary, with no human study identified; human safety, brain delivery and online product identity remain uncertain. People report nasal and injected use.

  • In a study in mice, months of dosing in food brought some benefits; no human study has been found. (animal)
  • People report using it for clearer thinking, learning and memory, though some report no benefit. (Reported by users)
  • One user reported faster thinking after a brain injury, but was also taking several other peptides at the same time. (Reported by users)

Uses in the sources

  • People report using it for clarity, learning and memory. Some report no benefit. (Reported by users) (source)
  • Some people use it in self-directed brain-injury stacks with Semax or Selank. No human combination benefit is established. (Reported by users) (source)

Related to P21

Sources

Sources checked: 2026-10-18.

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