For fuller looking, moisturised hair. Nioxin Cleanser System 4 is A daily volumising cleanser that gently removes residue & DHT from the hair & scalp & safeguards the scalp from drying irritation. For fine, chemically enhanced, noticeably thinning hair. Nine out of ten people perceive an increase in hair density when using the daily 3-Part System. How it works: Bio Amp: adds thickness & strength. Glyco-Color Shield: Dual protection technology designed to safeguard the scalp skin & preserve hair color. Scalp Protection: Formulated with herbs & botanicals to moisturize & help guard the scalp skin from chemical service residues. Hair Color Protection: Custom-built molecular technology designed to provide CLINICALLY PROVEN* color protection & vibrancy. Scalp Access Delivery System: Helps protect nutrients at they moisturize & energize the scalp & hair combined with SPF 15 scalp protection against UV rays.