Purpose The Nioxin System 4 Step 2 Scalp Therapy Revitalizing Conditioner for Colored Hair with Progressed Thinning helps to support fuller, thicker hair whilst protecting it against damage. Breakage is reduced and hair’s resilience is increased. System 4 is suitable for colour treated hair with progressed thinning. Method Apply from scalp to ends and leave on for 1 to 3 minutes then rinse off. Why it Works Using BioAMP technology that helps to make hair more resilient and controls the moisture balance. For optimal results use with System 4 Cleanser Shampoo and Scalp & Hair Treatment.