Cortex Eucommiae can be used to treat liver and kidney deficiencies (weakness of the liver and kidneys), soreness of the lower back and knees, and weakness of the tendons and bones, and should be taken under the guidance of a Traditional Chinese Medicine practitioner. Cortex Eucommiae, sweet in flavor and warm in nature; it belongs to the liver and kidney meridians and has the effects of tonifying the liver and kidney, strengthening the tendons and bones, and tranquilizing the fetus. It is used for dizziness, leakage of blood in pregnancy, restlessness of the fetus and hypertension. It is often used in combination with ginseng, Radix Rehmanniae Praeparata and Morinda Citrifoliae for the treatment of deficiency and coldness of the lower element, impotence of the kidney, and frequent urination; for the treatment of lumbar pain in kidney deficiency, and soreness of the waist and knees (the sensation of soreness and weakness of the waist and knees), it can be used in combination with walnut meat and tonic bone; for the treatment of insufficient kidney qi, lumbar pain and tinnitus, and soreness and weakness of the limbs, it can be used in combination with Yanhuisuo and cumin. Cortex Eucommiae should not be used with Snake Skin and Xuan Shen; frying with destroying its gelatin is favorable to decoction of active ingredients.