Excerpted from Bensky:  Chinese Herbal Medicine Materia Medica

• Tonifies the Liver and Kidneys, strengthens the sinews and bones:  for Liver and Kidney deficiency with such symptoms as weak, sore, or painful lower back and knees, fatigue, and urinary frequency.*
• Aids in the smooth flow of qi and blood:  used to promote circulation, especially in those with weakness of the sinews and bones.*
• Calms the fetus:  for patterns of cold from deficiency of the Kidneys with bleeding during pregnancy.*
• Recently used for dizziness and lightheadedness (hypertension) from rising Liver yang.*

Du Zhong - Eucommia Bark