Alpecin dandruff killer shampoo is formulated using 4 active ingredients that help to elimiate dandruff and also protects your scalp to prevent new dandruff from occuring it contains a combination of zinc pyrithione piroctone olamine salicylic acid fumaric acid panthenol allantoin and a galenic formula that helps to maintain the scalps resistance restores the scalps natural balance and removes existing dandruff