Address progressed thinning in colour-treated, dry or damaged hair with Nioxin System 4, the professional scalp and hair thickening system designed to promote fuller, stronger-looking hair. This advanced 3-step regimen combines a thickening shampoo, conditioner and leave-in treatment to help reduce breakage, improve hair density and enhance volume. Clinically developed to support scalp health and create an optimal environment for healthier hair growth, Nioxin System 4 helps deliver visible thickness and fullness in just 30 days. Learn more about Nioxin here, or shop the full Nioxin range here.