Its Not The Shampoo! Its Purvana! 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 systems while elastin allows skin to stretch like a spring and return to its original shape. These specialized proteins owe their unique properties to the sulfur bonds holding these tissues together. Because sulfar is so vital to their structure Purvana contains a great source of organic sulfur Methylsulfonylmethane M.S.M.. Silicon is also included to help overcome silicons limited solubility and to better meet the need for silicon in supporting the structural integrity and healthy development of these vital tissues. Purvana also provides Vitamin A 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.