I purchased Dembarah and Demal200 for my son when he spent a month touring Cambodia. No sickness at all. These products were recommended to me by a wonderful homeopath and they and the others in the range will be the only treatment I would take or recommend my family take for any future trips too. and I have just given these same products to a friend travelling to Laos and North Thailand.. she contracted Dengue as a child.. so there was only ever going to be one product I would recommend…