I recently went to South Africa to the Krueger Park area where Malaria may be contracted from Mosquito bites. I took some homeopathic medicine for Malaria, bug bites & parasites, as well as Demal 200 to boost my immune system. I did get 3 mosquito bites despite the homeopathic liquid to prevent bug bites. But I did not get malaria or anything else for that matter. I have not gotten even a cold or the flu since the end of November (two months). People all around me are sick with colds & the flu. So I am very pleased with the Demal200.