Cortex Eucommiae is commonly used to nourish the liver and kidneys. Generally speaking, it will not cause any damage to the liver if taken under the guidance of a doctor. Cortex Eucommiae belongs to the category of deficiency tonic, with the effects of nourishing the liver and kidney, strengthening the muscles and bones, and tranquilizing the fetus. It is mainly used to treat deficiency of liver and kidney (weakness of liver and kidney), such as lumbar and knee pain, weakness of muscles and bones, etc. It can be used alone, or soaked in wine or used with walnut kernel and other traditional Chinese medicines. Cortex Eucommiae can also be used for fetal restlessness, which can be seen as unstable fetus, blood, etc.; it can be used together with Sequence, Cuscuta, and other traditional Chinese medicines. Caution should be exercised if the body is characterized by yin deficiency and fire exuberance (deficiency of yin and essence in the body, resulting in hyperactivity of deficiency fire). Adverse effects are not known. Cortex Eucommiae is more effective when roasted in salt water, but the decision to use the medicine still needs to be made according to the individual’s constitution. If any discomfort occurs during the period of use, please stop taking the medicine immediately and consult a doctor promptly.