Head & Shoulders Extra Volume. The anti-dandruff shampoo removes up to 100% of visible dandruff, Its clinically proven formula contains Piroctone Olamine, the active ingredient that can fight Malassezia globose, the dandruff-causing microbe. This powerful shampoo controls flaking, scaling, and itching associated with dandruff and starts working from the first use. The pH balanced shampoo gives a 24-hour volume boost to flat and lifeless hair, keeping it bouncy but manageable.