Dandruff formation is a vicious circle. Stress, exhaustion and different pressures promote yeast fungal formation. This results in inflammation of the scalp, which in turn leads to increased dandruff development. The formation of the dandruff is often associated with itching and scalp irritation. The intensively effective Vichy Dercos anti-dandruff shampoo dry scalp interrupts this circulation and rebalances the scalp. The active ingredients Selenium DS (1%) and Cohesyl help in particular. Selenium DS (also called selenium disulfide) has a mineral origin. It is highly active and a recognised anti-dandruff active ingredient. This works specifically on the dandruff and removes even the most stubborn ones. In this way it prevents new dandruff. Ceramic Cohesyl plays an important role in the optimal build up of scalp cells. The cell anchoring is thus "cemented". This soothes the scalp and nourishes the hair.