Nioxin System 4 Cleanser (New) is for fine, chemically enchanced hair that is NOTICEABLY THINNING. A gently cleanser and removes toxins like DHT (Dihydrotestosterone). BioAmp adds thickness and strengthens the hair shaft. Bionutrients and Glyco-Fused Complex safeguard the scalp from drying chemical service irritation. Unique Scalp Access delivery system helps protect nutrients as the nourish the scalp and hair.