A vitamin is an organic molecule (or a set of molecules closely combined chemically, i.e. vitamers) that is an necessary micronutrient which an organism needs in little quantities for the proper practicing of its metabolism. essential nutrients cannot be synthesized in the organism, either at all or not in enough quantities, and therefore 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 count up the three additional groups of valuable nutrients: minerals, indispensable fatty acids, and indispensable amino acids. Most vitamins are not single molecules, but groups of amalgamated 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 supplementary 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 bitter 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 mass and differentiation. Vitamin D provides a hormone-like function, flexible mineral metabolism for bones and extra organs. The B perplexing vitamins decree as enzyme cofactors (coenzymes) or the precursors for them. Vitamins C and E sham 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 unaccompanied source of vitamins was from food. If intake of vitamins was lacking, the outcome was vitamin nonattendance and consequent lack diseases. Then, commercially produced tablets of yeast-extract vitamin B technical and semi-synthetic vitamin C became available.
This was followed in the 1950s by the deposit production and publicity 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 cutting supplementation during pregnancy reduced 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 single-handedly a rarefied of micronutrients valuable to life, every of which he presumed to be amines. with this presumption was far along definite not to be true, the "e" was dropped from the name. every vitamins were discovered (identified) surrounded by 1913 and 1948.
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