Nioxin system 4 cleanser shampoo is specifically designed for use on chemically treated and noticeably thinning hair using a natural blend of vitamins proteins and amino acids this shampoo will help to safeguard your scalp from chemical damage and preserve your hair colour promoting fuller more vibrant hair here at fragrance direct our customers are loving the range of nioxin hair care products that we have in stock and this nioxin system 4 cleanser shampoo is a popular purchase as i