Independent supplement ratingsUS and Canada · Updated weekly
A ratings desk for a category that has spent thirty years grading its own homework.
A ratings desk for a category that has spent thirty years grading its own homework.
Our scoring formula in public: ingredients and dosing at 40%, verified user reviews at 35%, price per serving at 25%, and what drops a product down the list.
Ingredients and dosing — 40%. Does the label deliver the ingredients that have human evidence, at the doses used in the research? This is the heaviest single input, and it's where most products lose.
Verified user reviews — 35%. Aggregated from sources we can point to, weighted by volume and recency. We link the sources; we do not invent them.
Price per serving — 25%. What you actually pay for one dose, not the sticker on the tub.
We don't sell positions. A brand can buy a labelled slot on this site; it cannot buy a rank, a score, or the removal of a flaw we found. If we can't verify something, we say so instead of guessing.
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