Please note that herbal supplements can be found under Herbal products.

As defined by the US Congress,* a dietary supplement is a product taken by mouth that contains a "dietary ingredient" intended to supplement the diet. The "dietary ingredients" in these products may include: vitamins, minerals, herbs or other botanicals, amino acids, and substances such as enzymes, organ tissues, glandulars, and metabolites. […] DSHEA places dietary supplements in a special category under the general umbrella of "foods," not drugs, and requires that every supplement be labelled a dietary supplement.
*Dietary Supplement Health and Education Act (DSHEA) of 1994. http://www.fda.gov/Food/DietarySupplements/ConsumerInformation/ucm110417.htm#what