P21
nootropicP21 is a research-use-only peptide. PeptideSource compares suppliers on purity, COAs, and price-per-mg.
Also known as: P-21, P021
P21 is a synthetic peptide known for its potential nootropic effects. It functions by interacting with neural pathways to influence cognitive processes. P21 first drew attention for its potential role in enhancing memory and learning capabilities. Researchers are interested in its precise mechanisms, given its ability to cross the blood-brain barrier. The peptide's applications continue to be explored in various neurological contexts. It is also being studied for its impact on brain plasticity and neuroprotection. Today, it is primarily studied for its effects on:
- Enhancing memory
- Improving learning capabilities
- Neuroprotection
- Brain plasticity
- Cognitive health
PeptideSource editorial · Updated Jul 18, 2026
For research use only. PeptideSource does not sell peptides directly. Compare third-party supplier listings at your own discretion.
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Size | ||||||
|---|---|---|---|---|---|---|
| Shop now | Shop | Shop | Shop | Shop | Shop | Shop |
| Product | P21 Spray Non-Lyophilized | P21 P021 | P-21 | P21 P021 | P21 | P21 P021 |
| Size | 10 mg | 10 mg | 10 mg | 5 mg | ||
| Price | $181.49 | $79.00 | $98.00 | $119.00 | $114.95 | $120.00 |
| Price/mg | $7.26/mg | $7.90/mg | $9.80/mg | $11.90/mg | $22.99/mg | $24.00/mg |
| Price change | 0% (16d) | 0% (10d) | 0% (10d) | 0% (16d) | 0% (16d) | 0% (10d) |
| Stock | In stock | In stock | Out of stock | In stock | In stock | In stock |
| Shipping | 5–7 days | Same or next-day shipping | Same-day dispatch before 12PM CT | 2–5 days | 3–5 days | Same/next-day dispatch |
| Reviews | 4.3(159) | 4.2(46) | 4.6(63) | 4.8(271) | 2.6(12) | 1.0(4) |
| Purity | — | — | — | 99.45% | 99% | 99% |
| COA | — | — | — | — | — | |
| Bulk discount | — | — | — | — | — | — |
