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vitamins Definition

Any of various organic compounds that are needed in small amounts for normal growth and activity of the body. Most vitamins cannot be synthesized by the body, but are found naturally in foods obtained from plants and animals. Vitamins are either water-soluble or fat-soluble. Most water-soluble vitamins, such as the vitamin B complex, act as catalysts and coenzymes in metabolic processes and energy transfer and are excreted fairly rapidly. Fat-soluble vitamins, such as vitamins A, D, and E are necessary for the function or structural integrity of specific body tissues and membranes and are retained in the body.

From Dictionary

Related topics from Britannica

  • vitamin
    any of several organic substances that are necessary in small quantities for normal health and growth in higher forms of animal life. Vitamins are distinct in several ways from other biologically ...
  • vitamin B6
    water-soluble organic compound that is an essential micronutrient for microorganisms and animals. It occurs in three forms: pyridoxine (or pyridoxol), pyridoxal, and pyridoxamine. Pyridoxine was ...
  • vitamin B12
    a complex water-soluble organic compound that is essential to a number of microorganisms and animals, including humans. Vitamin B12 aids in the development of red blood cells in higher animals. The ...
  • vitamin C
    water-soluble, carbohydrate-like substance that is involved in certain metabolic processes of animals. Although most animals can synthesize vitamin C, it is necessary in the diet of some, including ...
  • vitamin A
    a fat-soluble alcohol, most abundant in fatty fish and especially in fish-liver oils. Vitamin A is also found in milk fat, eggs, and liver; synthetic vitamin A is added to margarine. Vitamin A is not ...
  • vitamin E
    a fat-soluble compound found principally in certain plant oils and the leaves of green vegetables. Wheat-germ oil is a particularly rich source of the vitamin. Vitamin E, first recognized in 1922, ...
  • vitamin D
    any of a group of fat-soluble vitamins important in calcium metabolism in animals. It is formed by ultraviolet radiation (sunlight) of sterols present in the skin.
  • vitamin K
    any of several fat-soluble naphthoquinone compounds. Vitamin K (from the Danish word koagulation) is required for the synthesis of several blood clotting factors, including prothrombin and factors ...
  • vitamin B complex
    several vitamins that traditionally have been grouped together because of loose similarities in their properties, their distribution in natural sources, and their physiological functions, which ...
  • riboflavin
    a yellow, water-soluble organic compound that occurs abundantly in whey (the watery part of milk) and in egg white. An essential nutrient for animals, it can be synthesized by green plants and by ...

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