Eucommia spp. is an endemic species in China, and the main part of its medicinal use is the bark of the plant. This bark is found to have sticky threads in the middle when pulled. In the past, doctors saw that the sticky threads were like human tendons, so they considered it to have the effect of strengthening tendons and bones. Nowadays, Eucommia is mainly used for strengthening tendons and bones and tonifying the kidneys. It can be used for common clinical problems such as lumbago and weakness of kidney.