Beauty Fast Dissolve Natural Flavor Promotes Healthy Hair, Skin & Nails Helps Convert Food into Energy Extra Strength Vegetarian Dietary Supplement Natrol Biotin 5,000 mcg Fast Dissolve: Promotes healthy hair, radiant skin and stronger nails. Helps support energy metabolism and aids in the conversion of food into energy. Fast dissolve form-take anytime, anywhere, no water needed. Clinical studies have shown that those deficient in Biotin can experience hair loss and brittle nails.