Nioxin Cleanser Shampoo System 1 for natural hair with light 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 1. 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.