Noticeably thinning. www.nioxin.com. Questions? 1-800-935-5273 (US). Nioxin Cleanser helps to remove follicle-clogging sebum, fatty acids and environmental residues from the scalp skin and hair. Cleanses to provide thicker-looking hair. It is part of system 2 that contains 3 specialized technologies: BioAmp, Scalp Access Delivery System and Activ-Renewal.