Our Testing Protocol
Every batch of Retatrutide undergoes a comprehensive testing protocol before it ships. Testing is performed by independent, accredited laboratories — not in-house. Results are published as a batch-specific Certificate of Analysis (COA) accessible via a QR code on each vial.
Tests Performed
| Test | Method | Specification | Status |
|---|---|---|---|
| Purity | HPLC (Reverse Phase C18) | ≥99.0% | ● Pass |
| Identity | Mass Spectrometry (LC-MS) | 4,731 ± 2 g/mol | ● Pass |
| Peptide Content | Amino Acid Analysis (AAA) | ≥85% net peptide | ● Pass |
| Endotoxin | LAL Kinetic Turbidimetric | <1.0 EU/mg | ● Pass |
| Residual Solvents | GC-MS | ICH Q3C limits | ● Pass |
| Water Content | Karl Fischer Titration | <5.0% | ● Pass |
| C20 Acylation | HPLC + MS Fragmentation | Confirmed | ● Pass |
| Sterility | USP <71> | No growth at 14 days | ● Pass |
| Appearance | Visual Inspection | White lyophilized powder | ● Pass |
How to Access Your COA
Each vial includes a QR code on the label. Scan it with your phone camera to view the batch-specific Certificate of Analysis, including the exact purity percentage, molecular weight confirmation, endotoxin levels, and all test data for your specific batch.
If you need a COA before ordering or have questions about specific batch results, contact us at contact@vitalxlab.com or via our contact form.
Why Third-Party Testing Matters
Many vendors test in-house and self-report results. VitalxLab uses independent, accredited laboratories for all quality testing. This ensures no conflict of interest between production and quality control. The laboratory has no financial relationship with VitalxLab and reports results without bias.
The C20 fatty diacid acylation is explicitly verified — this structural modification is what extends the half-life to approximately 6 days by binding albumin. Without confirmed acylation, the peptide degrades rapidly and extended-duration research protocols fail. Many vendors skip this test. We don't.
Storage After Delivery
To maintain the purity documented in the COA, proper storage is critical. Lyophilized vials should be stored at -20°C (shelf life: 2 years). Once reconstituted with bacteriostatic water, store at 2–8°C and use within 28–30 days. Do not freeze reconstituted solutions.