Bosley Bos.Defence Nourishing Shampoo for Color Treated Hair 10.1oz. What it is: Gentle, sulfate free cleanser that helps to create a healthy environment for the hair and scalp, while extending the life of color What it does: Cleanses and removes toxins such as D.H.T. from the hair and scalp skin, a primary cause of hair thinning and hair loss and helps to extend the longevity of hair color How to use it: Apply daily to wet hair, massage gently, leave one minute and rinse. Feature: LifeXtend Complex - Hydrates and nourishes while strengthening and fortifying the follicles and hair shaft for thicker, fuller looking hair. Sulfate free - Gentle safer cleansing without potentially harmful ingredients. Color Keeper - Extends longevity of hair color.