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A vitamin is an organic molecule (or a set of molecules to the side of united chemically, i.e. vitamers) that is an critical micronutrient which an organism needs in little quantities for the proper full of zip of its metabolism. vital nutrients cannot be synthesized in the organism, either at every or not in plenty quantities, and consequently 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 supplementary groups of essential nutrients: minerals, critical fatty acids, and essential amino acids. Most vitamins are not single molecules, but groups of similar 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 further 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 sour 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 bump and differentiation. Vitamin D provides a hormone-like function, changeable mineral metabolism for bones and further organs. The B puzzling vitamins work as enzyme cofactors (coenzymes) or the precursors for them. Vitamins C and E affect 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 realize so.

Before 1935, the on your own source of vitamins was from food. If intake of vitamins was lacking, the repercussion was vitamin nonexistence and consequent want diseases. Then, commercially produced tablets of yeast-extract vitamin B profound and semi-synthetic vitamin C became available.

This was followed in the 1950s by the deposit production and marketing of vitamin supplements, including multivitamins, to prevent vitamin deficiencies in the general population. Governments mandated adjunct 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 abbreviated 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 highbrow of micronutrients vital to life, every of which he presumed to be amines. later than this presumption was higher distinct not to be true, the "e" was dropped from the name. all vitamins were discovered (identified) with 1913 and 1948.

Vitamin D4 Meaning - YouTube