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A vitamin is an organic molecule (or a set of molecules nearby joined chemically, i.e. vitamers) that is an essential micronutrient which an organism needs in little quantities for the proper dynamic of its metabolism. necessary nutrients cannot be synthesized in the organism, either at every or not in plenty quantities, and thus must be obtained through the diet. Vitamin C can be synthesized by some species but not by others; it is not a vitamin in the first instance but is in the second. The term vitamin does not insert the three other groups of valuable nutrients: minerals, indispensable fatty acids, and critical amino acids. Most vitamins are not single molecules, but groups of linked molecules called vitamers. For example, there are eight vitamers of vitamin E: four tocopherols and four tocotrienols. Some sources list fourteen vitamins, by including choline, but major health organizations list thirteen: vitamin A (as all-trans-retinol, all-trans-retinyl-esters, as with ease as all-trans-beta-carotene and new provitamin A carotenoids), vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B3 (niacin), vitamin B5 (pantothenic acid), vitamin B6 (pyridoxine), vitamin B7 (biotin), vitamin B9 (folic caustic or folate), vitamin B12 (cobalamins), vitamin C (ascorbic acid), vitamin D (calciferols), vitamin E (tocopherols and tocotrienols), and vitamin K (phylloquinone and menaquinones).

Vitamins have diverse biochemical functions. Vitamin A acts as a regulator of cell and tissue lump and differentiation. Vitamin D provides a hormone-like function, changeable mineral metabolism for bones and supplementary organs. The B highbrow vitamins pretend as enzyme cofactors (coenzymes) or the precursors for them. Vitamins C and E feint as antioxidants. Both deficient and excess intake of a vitamin can potentially cause clinically significant illness, although excess intake of water-soluble vitamins is less likely to get so.

Before 1935, the unaided source of vitamins was from food. If intake of vitamins was lacking, the consequences was vitamin lack and consequent dearth diseases. Then, commercially produced tablets of yeast-extract vitamin B rarefied and semi-synthetic vitamin C became available.

This was followed in the 1950s by the enlargement production and marketing of vitamin supplements, including multivitamins, to prevent vitamin deficiencies in the general population. Governments mandated addition of vitamins to staple foods such as flour or milk, referred to as food fortification, to prevent deficiencies. Recommendations for folic prickly supplementation during pregnancy edited risk of infant neural tube defects.

The term vitamin is derived from the word vitamine, which was coined in 1912 by Polish biochemist Casimir Funk, who unaccompanied a profound of micronutrients essential to life, every of which he presumed to be amines. in imitation of this presumption was innovative certain not to be true, the "e" was dropped from the name. all vitamins were discovered (identified) between 1913 and 1948.

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