Purify Shampoo is a silicone-free and sulfate-free purifying shampoo for oily scalps. Although sebum is an essential feature of a healthy scalp, its overproduction can result not only in the asphyxiation of the hair follicles, but also in an unsightly, greasy appearance. With this in mind, this shampoo helps rebalance oily scalps without disturbing their delicate balance.