Verified Peptide ReviewLast reviewed: 19 April 2026
Compound Profile · Cognitive
P21
P21 is a synthetic dipeptide investigated in research for neuroprotective and cognitive-support effects.
LegalResearch onlyEvidenceEmergingHuman useNot approved
6.0/ 10
Peptide Score
Evidence
Safety
Regulatory
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Quick verdict
Very limited published research. Efficacy and mechanism are not well-established.
Reality check
What this isn't
- Not approved for human use — research-only context
- No regulator has approved human use
- Evidence base is early — long-term data limited
- Side-effect profile not fully characterised
- Educational only — not medical advice
Full P21 review
A synthetic dipeptide.
Studied for neuroprotection in research contexts.
Looking at alternatives?
Compounds with comparable research interest but different evidence, regulatory status, or risk profile.