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A vitamin is an organic molecule (or a set of molecules to the side of joined chemically, i.e. vitamers) that is an indispensable micronutrient which an organism needs in small quantities for the proper in force of its metabolism. essential nutrients cannot be synthesized in the organism, either at every or not in passable quantities, and appropriately 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 increase the three new groups of essential nutrients: minerals, valuable fatty acids, and essential amino acids. Most vitamins are not single molecules, but groups of joined 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 competently 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 growth and differentiation. Vitamin D provides a hormone-like function, modifiable mineral metabolism for bones and extra organs. The B mysterious vitamins bill as enzyme cofactors (coenzymes) or the precursors for them. Vitamins C and E fake 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 do so.

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

This was followed in the 1950s by the growth production and marketing of vitamin supplements, including multivitamins, to prevent vitamin deficiencies in the general population. Governments mandated auxiliary of vitamins to staple foods such as flour or milk, referred to as food fortification, to prevent deficiencies. Recommendations for folic caustic supplementation during pregnancy condensed 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 solitary a rarefied of micronutrients critical to life, all of which he presumed to be amines. when this presumption was higher definite not to be true, the "e" was dropped from the name. every vitamins were discovered (identified) in the company of 1913 and 1948.

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