Vichy's Dercos Anti Dandruff Itchy Scalp Shampoo is designed for normal to oily hair. It eliminates visible flakes and provides up to 6 weeks' anti-relapse action. The shampoo uses microbiome technology and selenium disulphide, making it suitable for sensitive scalps. It has been proven to be effective on people exposed to stress, fatigue, and urban environments. The formula helps to maintain the scalp's natural balance and soothes to relieve itchiness. To use, apply the shampoo to wet hair, massage, leave on for 2 minutes, and then rinse. Results can be seen from the first application, and the shampoo provides control for up to 6 weeks.