The Nioxin’s System 3 Leave-In Scalp & Hair Treatment for Color treated with Light Thinning, refresh the scalp and increase your hair volume. This volumizing leave-on treatment helps to provide thicker-looking hair by increasing the fullness of each hair strand. Nioxin’s Scalp & Hair Treatment is the final step of the 3-part System, which amplifies hair texture while protecting against breakage. Amplifies hair texture. Volumizing Leave-on scalp treatment for Color treated hair with Light thinning. Protect against hair breakage. Increases volume of each hair strands. Contain Nicotinate. Best results achieved when used 3 steps together.