Follow the paper trail
How to check whether a COA is credible
Good typography proves nothing. Follow the chain from the vial to its lot number, then from the report number to the issuing lab's record.
Research Use Only. Verification can strengthen confidence in documentation; it cannot establish material safety or suitability for use in humans.
Practical checklist
- Match the lot exactly. Compare the COA's batch or lot identifier with the vial and packaging. Regard missing, partial, or different identifiers as a broken link.
- Identify the issuer. Distinguish the analytical laboratory from the vendor, manufacturer, or report distributor. Look for a laboratory name and report identifier—not just a logo pasted onto a vendor template.
- Prefer independent evidence. A qualified third-party laboratory reduces the conflict inherent in a vendor testing its own product. “In-house tested” is not automatically false, but it needs clearer method, instrument, operator, and quality documentation.
- Cross-check with the lab. Where the laboratory offers report verification, use the report number, QR code, secure link, or published verification process. Start from the laboratory's own site instead of trusting a link embedded in the vendor PDF.
- Confirm assay capability. Check the laboratory's own published service scope or ask it whether it performs the named test. A real lab name attached to an assay it does not offer is a warning sign.
- Inspect report integrity. Watch for inconsistent fonts, shifted logos, mismatched page sizes, cropped signatures, covered text, altered dates, low-resolution patches, or metadata inconsistent with the document's story. These clues warrant direct verification; none alone proves editing.
- Require method context. A result without an assay name, units, sample identifier, and basic method information is difficult to interpret or reproduce. Chromatograms and spectra should connect to the same sample and report.
- Test plausibility. Regard a bare “100.0% purity” claim as a red flag. Chromatographic integration depends on the method, detection, thresholds, and rounding. Check the full trace, impurity table, decimal precision, and stated calculation.
- Check dates and sequence. Confirm the sample receipt, analysis, and issue dates are present where applicable and occur in a plausible order.
Authentic paperwork has limits
An authentic report documents the sample the lab received under the methods it ran. It cannot prove that the vendor submitted a representative sample, that every vial matches, or that untested contaminants are absent. Keep the original file and note where and when you got it.