Sichuan Eucommia Bark Classic Formulas

Primary Actions

Tonifies the Liver and Kidney and strengthens sinews and bones - Chuan Du Zhong is used for chronic low back pain, weakness of the knees, fatigue, and constitutional deficiency affecting musculoskeletal stability.
Calms the fetus and supports pregnancy when deficiency is the root - it is one of the better-known herbs for threatened miscarriage associated with Kidney weakness, sore back, and restlessness of the fetus.
Supports the channels while gently securing what is weak - compared with more forceful Yang tonics, Du Zhong is nourishing and stabilizing rather than aggressively heating.

Du Huo Ji Sheng Tang - classic formula for chronic wind-damp painful obstruction with Liver-Kidney deficiency, where Du Zhong strengthens the back and knees.
Shou Tai Wan - classic fetus-calming formula that may include Du Zhong with Xu Duan, Sang Ji Sheng, and E Jiao for threatened miscarriage.
Many Kidney-tonifying low-back formulas combine Du Zhong with Xu Duan, Bu Gu Zhi, or Hu Tao Ren when weakness and lumbar soreness are central.

Traditional materia medica consistently describe Du Zhong as sweet and warm, entering the Liver and Kidney to strengthen sinews and calm the fetus.
The Sichuan designation Chuan Du Zhong reflects regional sourcing prestige rather than a separate basic action profile.
Its classical reputation is especially strong for deficient low back pain and pregnancy support linked to Kidney weakness.