Alpecin dandruff killer shampoo the first alpecin shampoo with 4 active ingredients 4 different active ingredients with 4 different modes of action form a joint anti dandruff defense system relieves scalp irritation removes dandruff and provides quadruple action against new dandruff the quadruple active ingredient complex zinc pyrithione and piroctone olamine are effective against fungi yeast and bacteria this prevents new dandruff and restores the scalp8217s natural balance