Biotin:Biotin is a water-soluble vitamin from the B-complex group that plays a crucial role in metabolic processes, particularly in the transfer of carbon dioxide, which is essential for the metabolism of carbohydrates and fats. A typical diet generally provides an adequate amount of biotin. Foods rich in this vitamin include nuts, grains, leafy green vegetables, and milk. However, a deficiency in biotin, which may lead to symptoms such as hair loss and a scaly red rash, can develop with prolonged intravenous nutrition or the frequent intake of raw egg whites, as they contain a protein called avidin that binds to biotin. During pregnancy, biotin supplementation is advised because the body's requirement for the vitamin increases, and many pregnant women may become deficient. Additionally, extended use of certain medical treatments that reduce biotin levels may necessitate extra supplementation.