A vitamin is an organic molecule (or a set of molecules next to partnered chemically, i.e. vitamers) that is an necessary micronutrient which an organism needs in small quantities for the proper working of its metabolism. vital nutrients cannot be synthesized in the organism, either at every or not in passable 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 additional groups of vital nutrients: minerals, vital fatty acids, and valuable amino acids. Most vitamins are not single molecules, but groups of related 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 skillfully as all-trans-beta-carotene and other 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 acid 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, changeable mineral metabolism for bones and other organs. The B perplexing vitamins piece of legislation as enzyme cofactors (coenzymes) or the precursors for them. Vitamins C and E be active 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 on your own source of vitamins was from food. If intake of vitamins was lacking, the upshot was vitamin dearth and consequent nonappearance 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 increase 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 pointed 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 by yourself a profound of micronutrients indispensable to life, every of which he presumed to be amines. with this presumption was future positive not to be true, the "e" was dropped from the name. all vitamins were discovered (identified) between 1913 and 1948.
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