Biotin is a water-soluble vitamin (B7), also known as vitamin H, which is widely distributed in all animals and plants at low concentrations, and is high in egg yolks, yeast, milk and poultry viscera. In addition, bacteria in the human intestinal tract can also synthesize a large amount of biotin, which is distributed in all tissues of the body, among which the content is the most in the liver and kidney. Biotin is a trace growth factor contained in every living cell. it is an important coenzyme in fat metabolism and other carboxylation reactions. it is indispensable to maintain the normal growth and development of human Chemicalbook and the health of skin and bone marrow. Lack of biotin in the body may lead to dermatitis, atrophic glossitis, hypersensitivity, myalgia, burnout, anorexia and mild anemia, and the symptoms will disappear after biotin supplementation. Its most common side effect is an outbreak of cystic acne. But for most people, even excessive consumption of this vitamin will not have a negative effect. However, pregnant women should not take biotin because there is a risk of miscarriage.