This Cleanser Shampoo from the Nioxin System 1 line is designed to purify the scalp and hair, removing excess sebum, fatty acids, and environmental residues that can clog hair follicles. It works to provide a clean environment for healthier, fuller-looking hair, optimized for noticeably thinning, natural hair. Use as the first step in the Nioxin 3-part System to cleanse the scalp and refresh the hair.