Biotin, also known as vitamin H, coenzyme R, also belong to the vitamin B family, it is the necessary material for the synthesis of vitamin C, and it is also the the essential substance of the normal metabolism of fat and protein. It is the crystal that colorless and long needle, with the parallel combination of urea and thiophene ring, and with the valeric acid side chain, can be dissolved in hot water, insoluble in organic solvents, and keep rather stable in normal temperature, but the high temperature and oxidizer can make its loss of activity.


It exists in the liver, egg yolk, milk, yeast and other foods. Biotin and enzymes involved in the body of carbon dioxide fixed and carboxylation process, the body's important metabolic processes such as pyruvate carboxylation transformed into oxaloacetate and acetyl coenzyme A carbonyl become malonyl coenzyme A in sugar and fat metabolism the main biochemical reactions. It is also certain microorganisms growth factor, a trace amount (0.005 μg) to test bacterial growth. For example, Alternaria mold growth requires very small amounts of biotin. Peope need to buy biotin because human body needs of about 100 to 300 micrograms in daily.


There is a kind of protein of antibiot in raw egg can combine with biotin, the biotin after combination can not be absorbed by the digestive tract; which cause the animal lack of biotin, then results in loss of appetite, glossitis, dander dermatitis, hair removal and so on. However, it is yet to occure any case due to lack of biotin, which may be excpet source from food, intestinal bacteria can also synthesize biotin. Cosmetic raw material Vitamin H prevents gray hair and hair loss, and maintain the role of skin health. If the biotin and vitamins A, B2, B6, niacin (vitamin B3) used in conjunction with complementary role better. Milk, beef liver, egg yolk, animal kidneys, fruit, brown rice containing biotin. Vitamin B complex and multivitamin preparations usually contain vitamin H.