Supplement Numbers, Side by Side

Field notes

Supplement Numbers organizes label data around distinctions that ordinary supplement packaging often compresses: serving-level dose, capsule-level dose, and chemical form. Its magnesium example uses a median across 6,971 products, while the project identifies the NIH Dietary Supplement Label Database as its source for more than 214,000 labels. The site explicitly presents label figures rather than independent test results and says broader comparison pages are still being built.