Ducray Squanorm Anti Dry Dandruff Shampoo Dry Dandruff 200 ml is an anti-dandruff treatment shampoo for dry dandruff. This shampoo contains three essentials actives that act rapidly and durably on the different factors originally of dry dandruff. Glycolate de Guanidine : Ducray's patented Keratoreducing active, prevents flakes from forming. Glycerin : acts to hydrate the scalp and thus reduces desquamation. Zinc Pyrithione : purifying active, acts on Malassezia. It longlastingly eliminates dry dandruff and purifies the scalp.