Nioxin System 4 Cleanser & Scalp Therapy for Fine Treated Hair Duo 33.8 oz Set System 4 -BioAmpTM adds thickness and strength. Glyco-Color ShieldTM Dual protection technology designed to safeguard the scalp skin and preserve hair color. Scalp Protection: Formulated with herbs and botanicals to moisturize and help guard the scalp skin from chemical service residues. Hair Color Protection: Custom-built molecular technology designed to provide CLINICALLY PROVEN* color protection and vibrancy. Scalp AccessTM Delivery SystemTM helps protect nutrients at they moisturize and energize the scalp and hair combined with SPF 15 scalp protection against UV rays.