At the University of Adelaide, scientists found that an extract from mistletoe grown on ash trees was found to be highly effective against colon-cancer cells in cell cultures and was gentler on healthy intestinal cells compared with chemotherapy. In fact, the extract was found to be more potent against cancer cells than the chemotherapy drug. It has been authorized for use by sufferers of colon cancer in Europe, but has not been allowed yet in some countries such as Australia and the United States due to a lack of scientific testing. (Read more)
We should note that the leaves and berries of some mistletoe species are mildly toxic. The plant is parasitic, growing on trees and forming green clumps that are highly visible this time of year and popular as Christmas decorations, especially at the top of doorways, where tradition calls for anyone standing under the mistletoe to be kissed.