Nioxins Cleanser Shampoo System 2 for natural hair with progressed thinning is the first step of a three part Nioxin regimen, specially formulated to deliver thicker, fuller hair, while protecting every hair strand against damage. It prepares the hair and scalp for a complete hair thickening treatment with Nioxins three part System 2. This professional derma-purifying Cleanser Shampoo removes dirt, excessive oil and other environmental residues from the scalp and hair.