Beauty Promotes Healthy Hair, Skin & Nails Helps Convert Food into Energy Fast Dissolve Natural Flavor Value Size 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.