The Office of Dietary Supplements (ODS) fact sheets give a current overview of individual vitamins, minerals and other dietary supplements. ODS has fact sheets in two versions—Health Professional and QuickFacts. Both versions provide the same types of information but vary in the level of detail. QuickFacts are now available in Spanish.
Featured Dietary Supplement Fact Sheets
Selenium is found naturally in many foods, including seafood.
The amount of magnesium you need depends on your age and sex.