A purifying shampoo for colored hair with progressed thinningWorks as the first hair care step of the 3-Part treatment Helps strengthen hair structure to prepare scalp & hair for a full thickening treatmentContains Pro-Shield technology for increased color protection & endurance Nioxin NIOXIN - Derma Purifying System 4 Cleanser Shampoo (Colored Hair, Progressed Thinning, Color Safe) 300ml/10.1oz