System 1 Scalp and Hair Treatment amplifies hair texture while refreshing the scalp and delivering a healthy shine. Helps to remove follicle-clogging sebum, fatty acids, and environmental residues from the scalp skin and hair. The volumizing Nioxin leave-on treatment helps provide thicker-looking hair by increasing the fullness of each hair strand. Nioxins diameter-increasing Scalp Treatment is the final step of the three part System, which amplifies hair texture while protecting against breakage.