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Nourishes Hair Skin and NailsVitamin Supplement Supports Energy Production Support Carbohydrate Protein and Fat Metabolism Science-Backed Quality Since 1969Get glowing! Often called "the beauty nutrient" because of the nourishment it delivers for healthy hair and scalp this member of the B-vitamin complex is a key cofactor of enzymes involved in fatty acid metabolism helping to supply cells with energy. Swanson Premium Biotin delivers 5 000 mcg (5 mg) of D-biotin the naturally occurring biologically active form. One reviewer states that Swanson Premium is the best biotin brand because of its small pill size compared to other brands.