Methodology
How we test and rate supplements
Every product we review is scored on the same five weighted factors, so you can compare brands fairly.
30%
Company transparency
Clear labels, published certificates of analysis, and honest marketing.
20%
Price
Cost per effective daily dose compared with similar products.
20%
Lab testing results
Independent testing for heavy metals, contaminants and label accuracy.
18%
Reviews and ratings
Verified customer feedback across multiple retailers.
12%
Ingredient quality
Bioavailable forms, research-backed doses and no unnecessary fillers.
Lab testing
We buy products at retail, just as you would, and send samples to accredited third-party labs. They check for lead, arsenic, cadmium and mercury, and confirm that the active ingredients match the label.
Evidence grading
Our medical reviewers grade the research behind each key ingredient, from strong clinical evidence to early or mixed results. We say so clearly when the science is still emerging.
Updates
We re-check our top picks at least twice a year and whenever a brand changes its formula. See our editorial guidelines for details.