Trust the Data. Not the Source.
| Vendor / Client | Tests | Best Purity | Latest Test |
|---|---|---|---|
| Rayshine Peptides | 2 | 99.76% | 18 SEP 2025 |
| XYX | 2 | 99.86% | 28 JUL 2025 |
| Shanghai Fushida Chemical | 2 | 99.27% | 07 JAN 2026 |
| Sigma Audley | 2 | 99.84% | 23 OCT 2025 |
| Qing Li Peptide | 1 | 99.56% | 15 MAY 2025 |
| Zhuoyan lab Peptide | 1 | 99.54% | 16 JUN 2025 |
| Penguin Peptide | 1 | 99.76% | 21 AUG 2025 |
| Cocer Peptides | 1 | 99.35% | 20 OCT 2025 |
| Qing Li Peptides | 1 | 99.18% | 07 OCT 2025 |
| Homopeptide.com | 1 | 99.23% | 07 JAN 2026 |
| Nexaph | 1 | 99.86% | 12 NOV 2025 |
| Peptide Gurus | 1 | 99.69% | 23 SEP 2024 |
| cellpept.eu | 1 | 99.14% | 14 NOV 2025 |
| utherpeptide.com | 1 | N/A | 20 JAN 2026 |