NSF/ANSI 173-2021 PDF

This Standard provides test methods and evaluation criteria for dietary supplement products to allow for the determination that the ingredients in the product are accurately identified, that the product contains the quantity of dietary ingredients and marker constituents declared on the product label, and that the product does not contain unacceptable quantities of contaminants.
This Standard provides criteria for determining that good manufacturing practices (GMP) were followed in the production of dietary supplements.