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In an ideal world, no one would need dietary supplements. Our balanced diets would provide all the vitamins, minerals and other nutrients our bodies need. Alas, the world of American eating is far from ideal. And that, some nutrition experts and supplement advocates argue, is why we need dietary supplements. The latest federal data show that more than half of U.S. adults use dietary supplements, mostly multivitamins.
A dietary supplement is a product intended for ingestion that contains a dietary ingredient intended to add further nutritional value to (supplement) the diet.A dietary ingredient may be one, or any combination, of the following substances: 1  a vitamin. 2  a mineral. 3  an herb or other botanical.4  an amino acid. 5  a dietary substance for use by people to supplement the diet by increasing the total dietary intake.ietary supplements may be found in many forms such as tablets, capsules, softgels, gelcaps, liquids, or powders. Some dietary supplements can help ensure that you get an adequate dietary intake of essential nutrients; others may help you reduce your risk of disease.