Nioxin System 4 Scalp and Hair Treatment - for Colored Hair with Progressed Thinning. A daily leave-in scalp treatment with SPF 15 sunscreen that protects scalp skin from harmful UVA and UVB rays - delivering essential botanicals, nutrients, antioxidants, vitamins and cytokines onto the scalp skin and hair to help safeguard against environmental residue and DHT buildup on the scalp. May cause temporary redness after application. BioAmp adds thickness and strength. Glyco-Color Shield 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 Access Delivery System helps protect nutrients at they moisturize and energize the scalp and hair combined with SPF 15 scalp protection against UV rays.