A vitamin is an organic compound and a vital nutrient that an organism requires in limited amounts. An organic chemical compound (or related set of compounds) is called a vitamin when the organism cannot synthesize the compound in sufficient quantities, and it must be obtained through the diet; thus...
Retinol (Vitamin A). Vitamins are organic (carbon-containing) nutrients obtained through the diet and essential in small amounts for normal metabolic reactions.
A vitamin is a chemical compound that is needed in small amounts for the human body to work correctly. They include Vitamin A, many B vitamins (like B1, B2, B3, B6, and B12), Vitamin C, Vitamin D, Vitamin E, and Vitamin K. For example...
Vitamin Purposes and Sources. Vitamin A - aids in growth, appetite, taste and eyesight. If you don’t get enough vitamin A, you may find yourself experiencing night blindness.
1920, originally vitamine (1912), from Latin vīta (“life”) (see vital) + amine (see amino acids). Vitamine coined by Polish biochemist Casimir Funk after the initial discovery of aberic acid (thiamine), when it was thought that all such nutrients would be amines.
vitamin, group of organic substances that are required in the diet of humans and animals for normal growth, maintenance of life, and normal reproduction.
vitamin B1. component of a coenzyme in carbohydrate metabolism; supports normal nerve function. impairment of the nerves and heart muscle wasting.
vitamin. (vī'tə-mĭn) Any of various organic compounds that are needed in small amounts for normal growth and activity of the body.
In humans there are thirteen vitamins, divided into two groups; four fat-soluble vitamins (A, D, E and K), and nine water-soluble vitamins (eight B vitamins and vitamin C).
Vitamin D is a fat-soluble vitamin that is naturally present in very few foods, added to others, and available as a dietary supplement.