DERCOS Anti-Dandruff Dry Shampoo is a shampoo for the treatment of dandruff in dry hair. In DERCOS's research laboratories, we discovered that one of the main causes of dandruff is a disruption of the microbiome. Based on this, we developed an anti-dandruff shampoo that targets the source of dandruff to achieve immediate effectiveness and a 6-week anti-recurrence action. Recommendations: For the first application, leave on for 2 minutes and then rinse. For subsequent washes, massage into your hair and then rinse for four weeks. Use two or three times a week.