Dietary supplement
A product (other than tobacco) intended to supplement the diet that bears or contains one or more of the following dietary ingredients: vitamin; mineral; herb or other botanical; amino acid; substance used by man to supplement the diet by increasing the total dietary intake; or concentrate, metabolite, constituent, extract, or combination of any previously described ingredient.
Toxicity
When too much of a vitamin or mineral accumulates within the body, resulting in illness or other symptoms.
Essential nutrient
Must be obtained in the diet, as the body is incapable of producing the nutrient on its own.