Purify Pre-Shampoo is a silicone-free and sulfate-free pre-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 versatile product helps purify and rebalance oily scalps without disturbing their delicate balance.