Nioxin Pro Clinical's System Kit 4 is specifically formulated for dry, damaged, color-treated hair experiencing advanced thinning.Nioxin - System 4 KitFor Coloured Hair With Progressed ThinningA professional 3-step system, including a shampoo, conditioner, and leave-on treatment, clinically designed to address advanced thinning in color-treated or dry, damaged hair.The Scalp + Hair Thickening Treatment features UV-protecting ingredients, offering added protection for both scalp and hair.Nioxin - System 4 - Scalp + Hair Shampoo - 300mlThis shampoo, clinically and dermatologically tested, nourishes and gently cleanses the hair, helping to prevent follicle-clogging sebum buildup. The result is visibly thicker and fuller hair. Nioxin - System 4 - Scalp + Hair Conditioner - 300mlThe System 4 Conditioner is a lightweight formula that strengthens hair, providing resilience while hydrating the scalp and hair from root to tip.Nioxin - System 4 - Scalp + Hair Thickening Treatment - 100mlSystem 4 Scalp + Hair Treatment revitalizes the scalp and boosts the volume of each strand, leaving hair looking fuller and thicker.