Alpecin Dandruff Killer Shampoo is formulated with four different active ingredients with four different modes of action to form an effective anti-dandruff defense system. Zinc pyrithione and piroctone olamine are effective against fungi, yeast and bacteria. This prevents new dandruff and restores the scalps natural balance. Salicylic acid and Fumaric acid help remove existing dandruff. This creates a smooth scalp surface, thereby reducing the colonization of microorganisms in a sustained manner. In addition, panthenol, allantoin and a sophisticated galenic formula prevent irritation and stabilise the scalp's resistance.