Every PE-22-28 certificate of analysis below is from an independent third-party lab, ingested and verified by TitrateLab. The figures here are computed live from the 10 published PE-22-28 certs in our corpus.
10
Certificates
1
Independent labs
99.8%
Median tested purity
89%
Within 10% of label dose
Verified PE-22-28 certificates of analysis
| Vendor | Purity | Dose vs label | Lab | Tested | |
|---|---|---|---|---|---|
| Qingdao Sigma Chemical | 99.624% | +11.3% | Janoshik | 2026-01-19 | View COA → |
| Xcel Peptides | 99.612% | +8.5% | Janoshik | 2026-01-07 | View COA → |
| Peptide Gurus | 99.316% | — | Janoshik | 2026-01-07 | View COA → |
| (unknown) | 99.861% | +0.0% | Janoshik | 2025-10-20 | View COA → |
| cocerpeptides.com | 99.861% | -3.5% | Janoshik | 2025-10-20 | View COA → |
| (unknown) | 99.898% | +0.0% | Janoshik | 2025-09-11 | View COA → |
| Nanjing Xiyuxun Technology Xyx | 99.884% | +0.0% | Janoshik | 2025-03-12 | View COA → |
| Peptide Gurus | 99.544% | +0.0% | Janoshik | 2025-02-04 | View COA → |
| Qingdao Sigma Chemical | 99.796% | +4.4% | Janoshik | 2024-09-03 | View COA → |
| PEPTIDES WORLD | 99.522% | +0.0% | Janoshik | 2024-06-24 | View COA → |