P21 Certificate of Analysis Results
What the P21 record shows
Evidence through 2026-08-22TitrateLab tracks 9 published P21 certificate-of-analysis records through 2026-08-22. Across 9 records with a usable peptide-purity result, the median reported purity is 99.1%. Across 7 records with measured-versus-label dose data, 29% are within 10% of the labeled quantity. This is a public convenience sample, not a randomized market survey; one result describes one submitted sample and does not verify other batches.
Limits and missing evidence
- No classifiable endotoxin results were recorded.
- Coverage depends on reports that were published and available to ingest.
P21 lab-testing metrics
COAs per testing lab
Every lab testing P21 in the corpus.
Tested-purity distribution
Bins below 90% tested purity (0% of certs).
| Purity range | Certificates |
|---|---|
| 0–50% | 0 |
| 50–70% | 0 |
| 70–80% | 0 |
| 80–85% | 0 |
| 85–90% | 0 |
| 90–91% | 0 |
| 91–92% | 0 |
| 92–93% | 0 |
| 93–94% | 0 |
| 94–95% | 0 |
| 95–96% | 0 |
| 96–97% | 0 |
| 97–98% | 0 |
| 98–99% | 3 |
| 99–100% | 6 |
COAs over time
P21 certificates published per month.
| Month | Certificates |
|---|---|
| 2025-10 | 1 |
| 2025-11 | 1 |
| 2026-03 | 1 |
| 2026-05 | 1 |
| 2026-06 | 1 |
| 2026-07 | 2 |
| 2026-08 | 2 |
Most-tested vendors
Vendors by P21 certificate count.
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Published P21 certificates of analysis
9 records. Zero guesswork.
Unlock the actual vendor, purity, dose accuracy, lab, batch and saved certificate for every P21 result.
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