Nioxin System 4 Cleanser Shampoo For Progressed Thinning Colored Hair. This salon-quality shampoo comes in a generous bottle, ensuring you have an ample supply for your daily cleansing needs. Designed to create a clean and healthy scalp environment, it effectively removes residue, debris, and impurities, setting the stage for healthier, fuller-looking hair. Nioxin's advanced formula is ideal for those experiencing progressed thinning and is gentle enough for colored hair, helping maintain its vibrancy while addressing thinning concerns.