NIOXIN System 2 Litre Duo - Nioxin System 2 Cleanser is a volumizing cleanser that helps to remove follicle-clogging sebum and environmental residues from the scalp and hair. Cleanses to provide thicker-looking hair for noticeably thinning, fine natural hair. Nioxin System 2 Scalp Therapy is a lightweight conditioner that helps provide hair resilience and controls moisture balance for noticeably thinning hair. For noticeably thinning, fine natural hair.