Vitamin

A vitamin is an organic molecule (or a set of molecules next to linked chemically, i.e. vitamers) that is an valuable micronutrient which an organism needs in little quantities for the proper in action of its metabolism. critical nutrients cannot be synthesized in the organism, either at every or not in enough quantities, and correspondingly 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 the three extra groups of necessary nutrients: minerals, necessary fatty acids, and vital amino acids. Most vitamins are not single molecules, but groups of united 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 without difficulty 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 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 bump and differentiation. Vitamin D provides a hormone-like function, regulating mineral metabolism for bones and further organs. The B puzzling vitamins doing as enzyme cofactors (coenzymes) or the precursors for them. Vitamins C and E undertaking 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 reach so.

Before 1935, the only source of vitamins was from food. If intake of vitamins was lacking, the repercussion was vitamin nonappearance and consequent nonattendance 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 mass production and publicity of vitamin supplements, including multivitamins, to prevent vitamin deficiencies in the general population. Governments mandated accessory 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 shortened 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 forlorn a technical of micronutrients necessary to life, every of which he presumed to be amines. in the same way as this presumption was later distinct not to be true, the "e" was dropped from the name. every vitamins were discovered (identified) amongst 1913 and 1948.

Long-Term Metformin Use Linked with Vitamin B12 Deficiency