dietary supplements

A dietary supplement is a manufactured product intended to supplement a person's diet in the form of a pill, capsule, tablet, powder, or liquid. A supplement can provide nutrients that are either extracted from food sources or are synthesized. The classes of nutrient compounds in supplements include vitamins, minerals, fiber, fatty acids, and amino acids. Dietary supplements may also contain substances that have not been confirmed as being essential to life, such as plant pigments or polyphenols