Biotin can be completely absorbed by the body. The member of the B-vitamin family, often referred to as B7, is available in small amounts in a variety of foods, although the highest quantities can be found in brewer's yeast, egg yolk, liver, kidney, pancreas, milk, soya, and barley. Biotin is involved in the metabolization, tolerance, and utilization of glucose. It also works to decrease the resistance of insulin. Biotin function is necessary for fatty acid synthesis and the metabolism of propionate. There is also evidence of antioxidant capability. It is believed that biotin can be stored in the mitochondria. Biotin is active throughout the body and is rarely deficient.