Zen Peptides: Lab Test Results
Independent Certificates of Analysis aggregated from public lab results. Not affiliated with or paid by Zen Peptides.
23
CoAs on file
98.93%
Avg reported purity
4
Compounds tested
Mar 3, 2026
Latest test
Results by compound
| Compound | CoAs | Avg purity | Latest |
|---|---|---|---|
| Retatrutide | 9 | 99.5% | Mar 2, 2026 |
| Tesamorelin | 6 | 96.86% | Feb 18, 2026 |
| GHK-Cu | 4 | 99.95% | Dec 16, 2025 |
| Tirzepatide | 4 | 99.75% | Mar 3, 2026 |
Recent CoAs
| Compound | Batch | Purity | Lab | Tested | |
|---|---|---|---|---|---|
| Tirzepatide | n/a | 99.9% | Lab E | Mar 3, 2026 | verify |
| Retatrutide | n/a | 99.78% | Lab E | Mar 2, 2026 | verify |
| Retatrutide | n/a | 99.81% | Lab E | Mar 2, 2026 | verify |
| Tirzepatide | n/a | 99.81% | Lab E | Feb 19, 2026 | verify |
| Tesamorelin | n/a | 98% | Lab E | Feb 18, 2026 | verify |
| Tesamorelin | n/a | 99.7% | Lab G | Feb 14, 2026 | verify |
| Retatrutide | n/a | 99.7% | Lab G | Feb 9, 2026 | verify |
| Tesamorelin | n/a | 85.72% | Lab E | Jan 18, 2026 | verify |
| Retatrutide | n/a | 99.8% | Lab G | Jan 6, 2026 | verify |
| Retatrutide | n/a | 99.6% | Lab G | Dec 31, 2025 | verify |
| Tesamorelin | n/a | 99.87% | Lab E | Dec 16, 2025 | verify |
| GHK-Cu | n/a | 99.95% | Lab E | Dec 16, 2025 | verify |
| Tirzepatide | n/a | 99.5% | Lab G | Dec 12, 2025 | verify |
| Retatrutide | n/a | 99.2% | Lab G | Dec 9, 2025 | verify |
| GHK-Cu | n/a | 99.95% | Lab E | Nov 17, 2025 | verify |
| Tesamorelin | n/a | 98.4% | Lab E | Nov 16, 2025 | verify |
| Retatrutide | n/a | 99.81% | Lab E | Nov 16, 2025 | verify |
| Retatrutide | n/a | 98.93% | Lab E | Nov 16, 2025 | verify |
| GHK-Cu | n/a | 99.95% | Lab E | Nov 3, 2025 | verify |
| Tesamorelin | n/a | 99.47% | Lab E | Nov 3, 2025 | verify |
| Tirzepatide | n/a | 99.8% | Lab G | Oct 23, 2025 | verify |
| GHK-Cu | n/a | 99.95% | Lab E | Oct 22, 2025 | verify |
| Retatrutide | n/a | 98.83% | Lab E | Oct 22, 2025 | verify |
Showing 23 most recent of 23. Search the full database on the CoA page.
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Data comes from publicly posted third-party lab certificates (Janoshik, MZ Biolabs, and others) and community submissions. Purity figures are as reported by the testing lab for the specific batch tested; they are not a guarantee of any other batch. For research and informational purposes only.