Food labeling is required for most prepared foods, such as breads, cereals, canned and frozen foods, snacks, desserts, drinks, etc. Nutrition labeling for raw produce (fruits and vegetables) and fish is voluntary. We refer to these products as “conventional” foods. For detailed information on dietary supplements, a special category of products that comes under the general umbrella of foods, but which has separate labeling requirements, see “dietary supplements.”* (Ref:FDA.gov).
* Terms such as “functional foods” or “nutraceuticals” are widely used in the marketplace. Such foods are regulated by FDA under the authority of the Federal Food Drug and Cosmetic Act, even though they are not specifically defined by law.