Editorial and Grading Policy

How grades work

Every ingredient receives a NutraTested Evidence Grade (A, B, C, D, or NE) reflecting the strength of the available peer-reviewed human evidence for each stated use, as of the review date shown on each page. See Methodology for the full rubric.

What we track and aggregate

We track and aggregate third-party testing and certification (NSF, Informed Sport, USP, published lab tests) and human research evidence. We do not run the tests ourselves. Every test result names who ran it, when it was published, and links to the primary source.

Independence

No supplement brand, retailer, certification body, or affiliate partner pays for or influences a grade, ranking, or test result. The editorial wall between our ratings and any commercial relationships is absolute.

Evidence evolves

Grades are a snapshot and may change as new research publishes. Each page shows when it was last reviewed.

Limitations

Our grades are an editorial synthesis, not a systematic review or meta-analysis, and are not medical or professional advice. They reflect reviewer judgment applied to a fixed rubric.

Sources

Published claims cite primary literature (PubMed) and certification-body registries.

Authorship and review

Each published ingredient page shows the reviewer and the date it was last reviewed. Reviews are conducted by the NutraTested editorial team against the published rubric, drawing on the cited primary literature and certification records.

Corrections

To report an error in a grade or summary, use our contact form.