We select products based on market research of popular supplements plus a tally of votes for specific products whenever we receive direct suggestions from consumers.
We buy products through major retail stores and online sites, just like the everyday consumer. Labdoor does not accept samples from manufacturers for grading or ranking purposes.
Analytical chemistry assays are performed on samples of each product at an FDA-registered lab. Default analyses include measurements of active ingredients and potential contaminants.
We calculate a Quality score using laboratory results and label claims from each product. Quality scores are comprised of individual scores for Label Accuracy, Product Purity, Nutritional Value, Ingredient Safety, and Projected Efficacy.
Products are ranked by overall Quality and by Value through a paired matching of Quality scores and price.
We publish detailed reports to summarize exactly what we found in our analyses and make this information and our rankings available to you for free.