Eucommia bark is derived from the eucommia trea which is native to China and the only cold-tolerate and rubber-producing tree. In prehistoric times, eucommia fossils indicate that its place of origin was previously in Europe and North America. Today, eucommia bark is found in China and used in traditional Chinese medicine. Eucommia bark, containing bio-available latex may help with wound healing since natural latex is a main component to the tree. Traditionally and now, eucommia bark is used as a tonic to treat issues dealing directly with the kidneys. In recent studies, its ability to help treat conditions in the lower part of the body have been shown effective, such as aching back and knees.