Comparison workspace
See the unknowns.
Offer terms, listed prices and evidence fields stay in separate rows, so the table never turns a missing value into a score or a price into a quality signal.
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Why a price can be blank
Listed prices come from the daily price check. Price per mg needs both a numeric price and a single mg amount; without them the right answer is “not calculable”, not an estimate. A price after a code isn't calculated because coupon terms aren't published as numbers.
What to ask next
Ask each vendor for the batch, lab, method, coupon terms and dates. Open the vendor record before you use a paid link. Start with the certificate check.