The Peptide Directory

Not approved (research only)CNTF-derived small molecule (P021)Cognitive research

P21

P021 is a small peptidomimetic derived from ciliary neurotrophic factor, studied in mouse models of Alzheimer's disease.

Last reviewed by The Peptide Directory Editorial Team

What is P21?

P021 is a small peptidomimetic derived from ciliary neurotrophic factor, studied in mouse models of Alzheimer's disease. P21 is not approved by the FDA for any use; products sold under this name are labeled for research use only, not for human consumption.

Key takeaways

  1. P21 is not approved by the FDA for any use; products sold under this name are labeled for research use only, not for human consumption.
  2. P21 has little indexed research under its own name; we list only papers whose titles name it.
  3. 7 vendors in our directory listed P21 in their public catalog on October 19, 2026.

Regulatory & access status

P21 is not approved by the FDA for any use; products sold under this name are labeled for research use only, not for human consumption.

Sellers that market unapproved peptides for human use can receive FDA warning letters; our vendor directory links any letter we found on fda.gov.

How much research exists on P21?

P21 has no reliable PubMed search term of its own (the name is shared with unrelated terms), so we list only papers whose titles name it. Search PubMed.

Most relevant recent papers

What the evidence does not show

  • Paper counts measure research attention, not whether P21 works or is safe.
  • No clinical trial in humans is tagged in PubMed under this name.
  • No FDA review of any "research use only" product's identity, purity, sterility or dose.

Research suppliers that list P21

7 vendors in our directory listed a product matching P21 in their public catalog on October 19, 2026. Listed alphabetically; a listing is not an endorsement. Research use only.

Prices per mg, where we could verify them, are on our price comparison.

P21 reconstitution math

Lab arithmetic only, not dosing guidance: use the peptide calculator to turn a vial size and diluent volume into a concentration.

P21 FAQ

Is P21 FDA-approved?

P21 is not approved by the FDA for any use; products sold under this name are labeled for research use only, not for human consumption.

Is P21 safe?

There are no published human safety trials of P21 that we could find. Products sold as "research use only" have no FDA review of purity, sterility or dose, and are not for human use.

How much research is there on P21?

P21 has little indexed research under its own name; we list only papers whose titles name it.

Who sells P21?

Bulk Peptide Supply, Core Peptides, Evolve BioPep, Liberty Peptides, ProtideHealth, Science.bio and 1 more listed it on their public catalogs when we checked; a listing is not an endorsement.

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