I recently purchased DEMAL200 whilst travelling around Cambodia. The areas of particular concern were the journeys around rivers and on water. On my return I was ill with a stomach bug and went to the Tropical Diseases hospital where they tested for Malaria amongst other possible causes. It was negative for Malaria fortunately. I found the homeopathic remedies very easy to use and as far as I was concerned they were effective in their protection against Malaria as I did not experience any problems with the disease. The service I received from Blue Turtle was extremely efficient, courteous and friendly as well as being very informative and useful. Thank You.