Ducray Kelual DS Anti Dandruff Shampoo 100ml / 3.3oz. Ducray Kelual DS Anti-Dandruff Shampoo is indicated for the scalp hygiene with severe scaling, dry or oily dandruff. Ducray Kelual DS Anti-Dandruff Shampoo purifies the scalp with severe dandruff, making it cleaner and smoother.