Certificates of Analysis (COA)
The current, valid Certificates of Analysis for every research peptide batch RETA UK has in circulation right now — independently verified by Janoshik Analytical for HPLC purity and mass spectrometry identity.
Current as of 5 June 2026
Every certificate below corresponds to a batch that is currently being shipped to UK researchers. When a lot sells through and a new batch arrives, it is tested again and the table is updated — so what you see here is always the documentation for the stock in circulation, never an expired or superseded report.
Search by product, laboratory or test date, then open View Certificate to see the full HPLC and mass-spectrometry report. Each one can be cross-checked directly with the laboratory using the task number and unique key printed on it. New to these documents? Read what a Certificate of Analysis is, or see how every batch is tested before it is released.
| Batch ID | Product | Test Type | Laboratory | Purity | Date | Certificate |
|---|---|---|---|---|---|---|
| EGB-0526-TR30 | Tirzepatide 30mg | 99.878% / 99.868% | Verify ↗ | |||
| EGB-0426-RT30 | Retatrutide 30mg | 99.710% / 99.456% | Verify ↗ | |||
| EGB-0226-RT10 | Retatrutide 10mg | 99.753% / 99.744% | Verify ↗ | |||
| EGB-0226-TR50 | Tirzepatide 50mg | 99.971% / 99.969% | Verify ↗ | |||
| EGB-0226-RT20 | Retatrutide 20mg | 99.200% / 99.475% | Verify ↗ | |||
| EGB-0126-TR10 | Tirzepatide 10mg | 99.850% / 99.826% | Verify ↗ | |||
| EGB-RT30-BBG50 | Retatrutide 30mg | 99.764% / 99.736% | Verify ↗ | |||
| EGB-0126-TR40 | Tirzepatide 40mg | 99.811% / 99.766% | Verify ↗ | |||
| EGB-0126-TR50 | Tirzepatide 50mg | 99.721% / 99.713% | Verify ↗ | |||
| EGB-0126-TR60 | Tirzepatide 60mg | 99.836% / 99.866% | Verify ↗ | |||
| EGB-0126-RT20 | Retatrutide 20mg | 99.873% / 99.887% | Verify ↗ | |||
| EGB-0126-RT40 | Retatrutide 40mg | 99.893% / 99.909% | Verify ↗ | |||
| EGB-RT50 | Retatrutide 50mg | 99.775% / 99.809% | Verify ↗ |
All certificates are issued by independent third-party laboratories and can be cross-verified directly at janoshik.com/verify using the unique key printed on each report.
The step-by-step quality-testing workflow — intake, quarantine, sampling, third-party HPLC and mass spectrometry, and the acceptance criteria a batch must clear before sale.
LearnA plain-English guide to reading a Certificate of Analysis for research peptides — what each figure means and why it matters.