The compare tool lines up two or three documented suppliers and shows their testing paperwork side by side: whether certificates of analysis are public, which third-party laboratory is named, whether the certificates can be verified on the laboratory's own website, whether batch numbers appear, and whether purity and safety data are reported. Every cell comes from the supplier's reviewed documentation profile.
A checkmark means we saw the document and it looked real; it does not mean we tested anything ourselves, and it does not mean "best." A cross or a dash means we have not seen the item, which is not the same as it being absent. There are no scores, totals, or winner rows — the grid exists so readers can read the evidence themselves.
Two to four suppliers can be compared at once. Rows cover fulfillment region, tracked materials, public pricing records, documentation availability, lot-specific documentation, testing information, laboratories named, shipping and refund policies, public contact information, and the review date. See the Supplier Desk for all profiles, the transparency lanes for how evidence types are organized, and Editorial Standards for our independence and disclosure rules.