Fever-Tree Indian Tonic Water launched in the UK in early 2005, the brand name chosen due to fever tree being the colloquial name for the cinchona tree in which quinine, a key ingredient for tonic, is found. The highest quality quinine was sourced from the Rwanda Congo border and blended with spring water and eight botanical flavours, including rare ingredients such as marigold extracts and a bitter orange from Tanzania. Crucially, no artificial sweeteners, preservatives or flavourings were added.