Whether it’s feeling that you can never wear any top that isn’t white ever again, because you don’t want the flakes to show, or being driven to distraction by the itchiness of your scalp, dandruff can have a real impact on everyday life. That’s where treatment shampoos can help. It’s thought that dandruff is caused by a naturally occurring fungus, Malassezia globosa, that is sustained by the oils on our skin and hair. It produces a compound that irritates the skin and can cause the rapid turnover of skin cells, which we see as flakes. Treatment shampoos contain a variety of active ingredients that help tackle the problem at the root.