Nioxin’s cleanser shampoo System 6 for Bleached / Chemically Treated hair with Progressed thinning is the first step of a , 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 3. This professional derma-purifying Cleanser Shampoo removes dirt, excessive oil and other environmental residues from the scalp and hair.