A Certificate of Analysis can look intimidating — a page of chromatograms, retention times, and numbers. But you don’t need to be an analytical chemist to tell a solid COA from a weak one. Here’s a field guide to the sections that matter.
1. Identity
Start at the top: does the COA name the exact compound and, ideally, its sequence or molecular formula? The identity section should be backed by mass spectrometry — look for a measured molecular weight compared against the theoretical (expected) weight. If the two match, the compound is what it claims to be.
2. Purity and the chromatogram
The purity figure — usually expressed as a percentage from HPLC — is the headline number. But look at the chromatogram itself if it’s included. You want to see one clean, dominant peak. A cluster of smaller peaks alongside it indicates impurities, even if the headline purity still reads high. The percentage and the visual should tell the same story.
3. Method and instrument
A credible COA states how the analysis was done — the technique (e.g. RP-HPLC, ESI-MS), and often the instrument and conditions. Vague results with no stated method are a warning sign. The method is what makes the number reproducible and meaningful.
4. Batch number and date
Crucially, the COA should carry a batch or lot number, and it should match the number on the vial you received. A COA for a different batch is no COA at all. Check the date of analysis too — results should relate to the material in your hands, not a sample tested years earlier.
5. The issuing laboratory
Finally, who signed it? A named, independent, accredited laboratory carries far more weight than an unnamed “in-house” stamp. Independent issuance removes the conflict of interest that comes with a supplier grading its own product.
Quick checklist
- Identity confirmed by mass spectrometry?
- Purity reported with a chromatogram?
- Analytical method stated?
- Batch number matches your vial?
- Issued by a named, independent lab?
Every VeridianLabs product carries an independent COA covering each of these points, downloadable from the product page.
All compounds supplied by VeridianLabs are for research use only. This article is provided for informational purposes and does not constitute medical advice or any health claim.