The structures of the hair, skin, and nail tissue are very similar, requiring almost identical raw materials to grow and remain healthy. Collagen is the most abundant protein in the integumentary system, while elastin allows your skin to stretch like a spring and return to it's original shape. These specialized proteins owe their unique properties to the sulfur bonds holding these tissues together. Because sulfur is so vital to their structure, Puriclean has included a great source of organic sulfur, Methylsulfonylmethane (M.S.M.). They have also included silicon to help overcome silicon's limited solubility and to better meet the need for silicon in supporting the structural integrity and healthy development of these viatal tissues. Purvana also provides Vitamins A (as natural beta-carotene), C, D and all of the B vitamins, and most importantly, very high levels of biotin because it is absolutely essential for the growth of healthy hair, skin and nails.