Ducray Kelual DS Treatment Shampoo's formula contains 2 anti-microbe active ingredients which are complementary, Cuclopiroxolamin and Purithione Zinc. Their effectiveness have been scientifically established of yeasts (tyoe malasseza) principal cause of dandruff. Ducray Kelual DS Treatment Shampoo also contains Keluamid, original exfoliating active ingredient, which potentialities the anti-dandruff activity and sanitizes hair scalp.