Vichy Dercos Anti-Dandruff Shampoo for Dry Hair Product description: Highly effective shampoo with microbiome technology enhanced with selenium DS. Cleans up to 100% of visible dandruff. Selenium DS technology to maintain a healthy microbial environment for the hair. Reduces visible dandruff from the first use. Reduces the feeling of itchiness, with results lasting up to 6 weeks. Tested under dermatologists' supervision. Size: 200 ml. Instructions for use: On the first use, leave on the hair for two minutes, then rinse. During subsequent washes, massage the hair then rinse. A 4-week care program.