Nioxin’s Cleanser Shampoo System 4 for colored hair with progressed thinning is the first step of a 3 part Nioxin regimen, specially formulated to strengthen the hair and amplify hair structure. It prepares hair and scalp for a complete hair thickening treatment with Nioxin’s three-part System 4. This professional derma-purifying Cleanser Shampoo removes dirt, excessive oil and other environmental residues from the scalp and hair.Βest results achieved when used 3 steps together.Νioxin is the n°1 salon brand for thicker and fuller hair with more than 30 years expertise in thinning hair.