The Institute of Traditional Medicine was set up in 1979 with assistance from World Health Organization (WHO) to develop and popularise Bhutanese herbal medicine, which has been used by the rural people in Bhutan for many centuries. The Institute is located on a hill promontory above the Thimpu town. It is a semi-wooden structure built colourfully like a "Manor House". Traditionally, Bhutanese medicine has been influenced by traditional Tibetan medicine and also some aspects of Indian medicine, particularly the "Three Humors of bile, wind and phlegm" that "dictates the state of our physical and spiritual health." The Institute is well manned by scientists who claim that they have now developed a "mixture of five herbs that could "possess spermogenitic powers" (a kind of a herbal viagra), which is under testing before development and marketing on a commercial basis. The main herb used is stated to be Cordyceps sinensis (caterpillar fungus), whose productive buds are available in the hills of Bhutan.