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We select products for testing.

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.

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We purchase those products.

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.

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We prepare samples for testing.

We record each product's lot number and expiration date, take pictures of its label, and portion out a sample for testing at an FDA-registered laboratory.

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We collect testing data.

A series of analytical chemistry assays are performed on each product. Default analyses include measurements of active ingredients and potential contaminants.

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We convert that data into scores.

Laboratory results and label claims for each product are used to calculate a Quality score, which is comprised of individual scores for Label Accuracy, Product Purity, Nutritional Value, Ingredient Safety, and Projected Efficacy.

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We generate grades and rankings.

Products are ranked and assigned an A through F grade based on their overall Quality score. Products are also ranked by Value through a paired matching of quality and price.

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We publish our findings.

We publish detailed reports on each supplement category and product to summarize exactly what we found in testing. Grades, rankings, and reports are made available to you for free on Labdoor's web applications.