I am very impressed with Blue Turtle's products. We did a flying safari this year through Mozambique, Malawi, Zambia and Botswana staying in several malarial areas. My husband and I used Demal 200 and Hepatex 200 as per instructions and never had a problem. Also of course, we never had to suffer any side effects from anti-malarial drugs. I will certainly be using your products again - many thanks!