The law defines dietary supplements in part as products taken by mouth that contain a "dietary ingredient." Dietary ingredients include vitamins, minerals, amino acids, and herbs or botanicals, as well as other substances that can be used to supplement the diet.
Dietary supplements come in many forms, including tablets, capsules, powders, energy bars, and liquids. These products are available in stores throughout the United States, as well as on the Internet. They are labeled as dietary supplements and include the following, in addition to other items:
Source: . Consumer Updates - FDA 101: Dietary Supplements [WebContent]. Retrieved from https://www.fda.gov/ForConsumers/ConsumerUpdates/ucm050803.htm