An organic micronutrient required in small amounts for normal growth, metabolism, maintenance, and physiological function.
Humans need several vitamins, including vitamins A, C, D, E, K, and the B vitamins. Most must be obtained through the diet, although some can be produced in limited amounts by the body or by microorganisms associated with the body.
Vitamins differ in their chemical structure, functions, sources, and how they are absorbed and stored. They are broadly classified as fat-soluble or water-soluble.
QUICK FACT
Vitamins do not provide calories like carbohydrates, fats, and proteins, but they are essential for many processes that allow the body to use energy and maintain itself.
COMMONLY CONFUSED WITH
Mineral: an inorganic micronutrient such as iron, calcium, or zinc; vitamins are organic compounds.
SEE ALSO
