The physiological function of vitamin H

Biotin, also known as vitamin H, coenzyme R, also belongs to vitamin B family, which is the synthesis of vitamin C, essential substances, is essential to normal metabolism of fat and protein substances. Is a colorless long needle-like crystals, with urea and a combination of Pian thiophene ring, and with the acid side chain, can dissolve in hot water, insoluble in organic solvents, relatively stable in normal temperature, but the heat and oxidants can the loss of activity. It exists in the liver, egg yolk, milk, yeast and other food. Biotin binding with the enzymes involved in the body of carbon dioxide fixation and carboxylation process, and the body's important metabolic processes such as pyruvate carboxylation and the transformation into oxaloacetate, acetyl coenzyme A carbonylation into malonyl-CoA A sugar and fat metabolism, etc. The main biochemical reaction. It is also of some microbial growth factor, very trace (0.005 micrograms) can allow bacterial growth experiment. For example, the growth of Neurospora crassa requires a very small amount of biotin. The human body each day about 100 to 300 micrograms. Health egg there is an anti-biotin and bio-binding protein, biotin combination can not be absorbed from the digestive tract; caused by a lack of biotin in animals, this time there loss of appetite, glossitis, dander dermatitis, hair removal and so on. However, not yet see the lack of human cases of biotin may be due to other sources in addition to food, intestinal bacteria can synthesize biotin with the rules. Vitamin H with the prevention of gray hair and hair loss and maintain skin health role. If biotin and vitamin A, B2, B6, niacin (Vitamin B3) with the use of complementary, roles better. In the milk, beef liver, egg yolk, animal kidneys, fruit, brown rice all contain biotin. In the vitamin B complex and multi-vitamin preparations usually contain vitamin H.