For dry dandruff, Ducray Squanorm Anti Dry Dandruff Shampoo 200 ml is an anti-dandruff treatment shampoo. Three key active ingredients in this shampoo work quickly and effectively on the many causes of dry dandruff. Glycolate de Guanidine: Flake formation is inhibited by Ducray's unique Keratoreducing active. Glycerin moisturizes the scalp, preventing desquamation. Purifying agent zinc pyrithione works on Malassezia. It cleanses the scalp and gets rid of dry dandruff for good.