Online catalog of the vitamins from food or pills. Nutritional advice online.
Vitamins perform a catalytic function as a part of the active centers of various enzymes and may also participate in the regulation of humoral as prohormones and exogenous hormones. Despite the critical importance of vitamins in metabolism, they are not a source of energy for the body (not possess calorie) or structural components of tissues.
The concentration of vitamins in the tissues and the daily demand for them is small, but insufficient intake of vitamins in the body attacking and dangerous characteristic pathological changes.
Most vitamins are not synthesized in the human body, so they must be regularly and in sufficient quantity ingested with food or in the form of vitamin and mineral supplements and food additives. The exceptions are vitamin D, which is produced in human skin under the action of ultraviolet light; Vitamin A, which can be synthesized from the precursors entering the body with food; and niacin, which is a precursor of the amino acid tryptophan. In addition, vitamin K and B3 are usually synthesized in adequate amounts bacterial microflora of human colon.
In violation of vitamins in the body linked 3 principal pathological condition: the lack of vitamin – vitamin deficiency, lack of vitamin – vitamin deficiencies, and excess vitamin – hypervitaminosis.
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