Why independent third-party testing matters

If the party that sells a lot is also the party that reports its purity, the report and the listing come from the same source. That is not an accusation of dishonesty; it is a description of an incentive. A laboratory result is only as trustworthy as the independence of the laboratory, and a supplier cannot be independent of itself.

The fix is structural, not procedural. Send the lot to a laboratory that has no stake in whether it passes. If it fails, the supplier eats the cost. That is the arrangement we run.

The laboratory that assays our lots is paid for the analysis, not for the result. It does not sell the material, it does not earn anything when a lot is listed, and it has no reason to prefer one outcome over another. Purity is measured by HPLC; identity is confirmed by mass spectrometry. A lot that does not meet specification is never listed — see the quality page for the full standard.

Testing is only half of independence. The other half is timing. A certificate that is produced when a customer asks for one is a certificate that might never have been produced. Ours is published with the lot before it goes on sale. Every listing carries its purity, its specification and its lot certificate at the point of listing, so the decision to list a lot is made with the result in hand — not the other way round.

Independence also depends on granularity. A certificate for "the compound" is not a certificate for your vial. Material is released by lot, and each lot carries its own certificate; nothing is blended between lots after testing. That is what makes the number on your vial map to a single assay, and it is what makes reading the certificate meaningful rather than ceremonial. We go into the mechanics in lot numbers and lot discipline.

The strongest form of independence is the researcher's own. If you commission independent testing on a lot you bought and the result shows it falls below its stated purity, send us the report: under the returns policy we will replace the material or refund it in full. That guarantee only makes sense for a supplier whose numbers were produced by someone else in the first place.

Independence is easy to claim and easy to check. Four questions settle it for any supplier of reference materials:

• Who performed the analysis? A named third-party laboratory, or the supplier itself?
• When is the certificate available? Before the lot is listed, or only on request afterwards?
• What does the certificate cover? Purity by a stated method, identity by a stated method, both, or a bare number with no method?
• What happens if independent testing disagrees? A written policy, or silence?

The answers for this site are on the quality page: a third-party laboratory with no commercial interest in the result, published with the lot before it goes on sale, purity by HPLC and identity by mass spectrometry, and a written replacement-or-refund guarantee. Any supplier can be asked the same four questions, and the ones worth buying from will answer them the same way.

An independent certificate describes the lot on the day it was tested. It does not describe any application, and it does not extend past the point where storage and handling become the researcher's responsibility. All material is supplied strictly for in-vitro laboratory research; see research use only.