It is believed that dandruff and seborrhoeic dermatitis are associated with an excessive presence of a specific yeast that normally lives on our bodies but which, in some people, increases in number and leads to these problems. This yeast, called P ovale, thrives in certain conditions on the scalp and various other areas of the body. Ketoconazole is a powerful anti-fungal agent that inhibits the growth of various fungi and yeasts. The use of SEBIZOLE SHAMPOO containing ketoconazole may help to control dandruff and seborrhoeic dermatitis. The anti-fungal ingredient accumulates in the hair and this provides the basis for sustained activity.