Methodology
Scores are rebuilt daily from the same public inputs. Sponsorship never affects score, grade, or ranking order.
We resolve every published certificate at the testing lab itself. A certificate that will not resolve counts as no certificate at all.
Vendors earn coverage points for how much of their catalog has current, tracked prices we can compare against the market median.
Independent test results add to the score in proportion to how many distinct batches were tested, not how good a single result was.
Public review scores are bonus signals with a hard cap. A vendor with strong first-party evidence can rank without any of them.
Missing documentation, expired certificates, and unresolved complaints apply a negative cap that no bonus can outweigh.
Nothing on this site is medical advice, and no listing is an endorsement of human use.