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.
This is the category with the loudest marketing and the thinnest evidence. We rated every product on whether its active ingredients are dosed to the level actually used in human trials — not on the claims on the tub.
Most of these products stand or fall on one thing: whether the ingredients that have any human evidence — tongkat ali, boron, zinc, vitamin D in deficient men — are dosed like the studies, and whether the rest is filler. A tub can be “clinically studied” and still be underdosed on every line that matters.
Prices are checked at publication and re-checked monthly. Where a brand changed its formula and we could not re-verify the new label, we say so rather than guess. Read the full method →