Is Nature Made third party tested?

Partly: 43 of the 74 products we track. Of the 74 Nature Made products we track across 12 categories, 43 are confirmed at the exact package by a certifier, 3 match a row in USP’s directory not yet confirmed for the package we price, 25 appear in no database we searched and 3 match a listing not settled either way.

No certifier lists a whole brand. NSF names specific packages on each listing; USP names a product and a strength and puts its mark on the label, so a USP package counts here only when the directory row and the mark on its own label both hold. So “Nature Made is third party tested” can be true of one bottle while the size, strength or line beside it has no listing or row. Each row below says which.

No listing is an absence in a database, not a failed test: these programs certify what a company submits to them. NSF Certified for Sport, the Informed programs' published product lists, the IFOS directory and USP's directory are each read in full. Each product page names the day.

Every category we compare: the home page. Every question we answer: the question index.

What this rests on: prices we last recorded at the retailer named on each product page, which go stale, and each page says when it was checked; the products we track, not every product sold, and Amazon and Walmart are not among the stores; listings and labels read at the source, each linked from the page. Found an error? Tell us. The full method: How we compare.