Protect and refresh the scalp with Nioxin's 3-part System 4 Scalp & Hair Treatment for Colored Hair with Progressed Thinning. This diameter-increasing leave-on hair and scalp treatment is particularly formulated for colored hair with progressed thinning. Nioxin's treatment Scalp Access Delivery System 2. 0 technology helps prevent hair loss due to breakage, providing a refreshed scalp environment. Nioxin's Scalp and Hair Treatment is the final step of a 3-part System, designed to strengthen the hair and amplify hair structure. | NIOXIN System 4 Scalp and Hair Leave-in Treatment for Color Treated Hair with Progressed Thinning, 6. 8 oz | Dermstore