Each capsule of Biotin 5000 contains 5000 μg (micrograms) of biotin, which is another way to denote 5 mg (milligrams). Each capsule of HiBiotin contains 100 mg of biotin. Biotin is an essential coenzyme for a variety of carboxylation reactions, including the activation of acetylCoA carboxylase, a crucial enzyme in the normal, healthy synthesis of myelin. Biotin is involved in the metabolism of fats, sugars and amino acids. Biotin is crucial for the utilization of glucose for energy, the breakdown and utilization of fatty acids in energy production, and the synthesis of protein from amino acids.