Eucommia is warm in nature and is suitable for patients with kidney yang deficiency, so people with simple kidney yin deficiency should not take Eucommia, if accompanied by kidney yang deficiency then it is OK, but the efficacy of a single medicine is limited, and may not achieve the expected therapeutic effect, and it is necessary to identify the symptoms under the guidance of a doctor. Cortex Eucommiae belongs to the liver and kidney meridians, it has the effect of tonifying the liver and kidney, strengthening the muscles and bones, and stabilizing the fetus. It is warm in nature and has the effect of warming and tonifying the kidney yang (warming and supplementing the yang qi of the kidneys), and it is mainly used in treating the deficiency of the liver and kidney (weakness in the liver and the kidneys) resulting in weakness of the muscles and bones and soreness of the waist and knees (the sensation of soreness and weakness in the waist and knees), etc. It is not suitable to be taken by patients with simple deficiency of kidney yin. However, the kidney yin and yang will interact with the development of the disease, kidney yin deficiency to a certain stage of development may have an impact on the kidney yang, resulting in kidney yin deficiency accompanied by kidney yang deficiency symptoms, such patients are usually can be decocted with dulcimer to drink, but a single medication is limited in efficacy, may not achieve the desired effect, but also need to be paired with other medications. Traditional Chinese medicine is about evidence-based treatment, and the Chinese medicines used may be different for different causes of disease, so if you are in discomfort and need to use medication, please go to the hospital and use medication under the guidance of a professional doctor.