Sichuan Eucommia Bark
- Chinese
- 川杜仲
- Pinyin
- Chuan Du Zhong
- Latin
- Cortex Eucommiae
Known in TCM as Chuan Du Zhong (川杜仲), this sweet and slightly acrid, warm herb enters the Kidney and Liver. Traditionally, it 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, most often applied for low back pain, threatened miscarriage, and hypertension. Modern research has identified Lignans among its active constituents.
Part used: Bark
Also Known As
Latin: Cortex Eucommiae | Pinyin: Chuan Du Zhong | Chinese: 川杜仲
TCM Properties
- Taste
- sweet, slightly acrid
- Temperature
- warm
- Channels
- Kidney, Liver
Traditional Use
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.
Secondary Actions
- Chuan Du Zhong is best understood as a respected regional or daodi designation of standard Du Zhong rather than a completely different medicinal substance.
- Its overlap between orthopedics, reproductive support, and Kidney-Liver deficiency makes it one of the classic bridge herbs between musculoskeletal and gynecologic practice.
Classic Formulas
- 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.
Classical References
- 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.
Modern Research
Active Compounds
- Lignans - widely studied constituents related to bone, vascular, and antioxidant effects
- Iridoids such as geniposidic acid - signature compounds in Eucommia pharmacology
- Chlorogenic acid and related phenolics - contributors to antioxidant and metabolic interest
- Flavonoids and resinous gutta-percha-associated fractions - part of the bark's broader pharmacognostic profile
Studied Effects
- A 2019 review summarized extensive traditional use alongside modern evidence for antihypertensive, anti-inflammatory, osteoprotective, and metabolic effects of Eucommia ulmoides (PMID 30857406).
- A small clinical trial found that standardized Eucommia bark extract was safe in mild hypertension, though the blood-pressure effect was modest rather than dramatic (PMID 22214253).
- A 2024 review of different medicinal parts of Eucommia ulmoides confirmed that bark remains the canonical TCM part while modern research also explores leaves, flowers, and seeds (PMID 38545153).
PubMed References
- Ethnobotany, Phytochemistry and Pharmacological Properties of Eucommia ulmoides: A Review (2019)
- A clinical trial testing the safety and efficacy of a standardized Eucommia ulmoides Oliver bark extract to treat hypertension (2011)
- Biological properties and potential application of extracts and compounds from different medicinal parts (bark, leaf, staminate flower, and seed) of Eucommia ulmoides: A review (2024)
Safety & Interactions
Contraindications
- Use only with professional guidance when low-back pain or bleeding during pregnancy needs emergency evaluation
Cautions
- Du Zhong is generally well tolerated, but therapeutic use in pregnancy should still be supervised even though one of its traditional indications is threatened miscarriage.
- Regional naming such as Chuan Du Zhong should not be confused with a different species or with adulterated bark.
- MSK page not found - drug interaction data not available from Memorial Sloan Kettering integrative medicine database
Drug Interactions
- Antihypertensive medications - theoretical additive blood-pressure-lowering effect
Conditions
- Low Back Pain Traditional ★★★★☆ JSON
- Threatened Miscarriage Traditional ★★★★☆ JSON
- Hypertension Research ★★☆☆☆ JSON
- Impotence Traditional ★★★☆☆ JSON
Frequently Asked Questions
What is Sichuan Eucommia Bark used for?
Sichuan Eucommia Bark is traditionally used to 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.. Research has investigated its effects on: A 2019 review summarized extensive traditional use alongside modern evidence for antihypertensive, anti-inflammatory, osteoprotective, and metabolic effects of Eucommia ulmoides (PMID 30857406).; A small clinical trial found that standardized Eucommia bark extract was safe in mild hypertension, though the blood-pressure effect was modest rather than dramatic (PMID 22214253)..
What are other names for Sichuan Eucommia Bark?
Sichuan Eucommia Bark is also known as Eucommia. In TCM: 川杜仲 (Chuan Du Zhong); Cortex Eucommiae.
Is Sichuan Eucommia Bark safe during pregnancy?
The safety of Sichuan Eucommia Bark during pregnancy has not been established. Consult a qualified healthcare provider before use.
What are the contraindications for Sichuan Eucommia Bark?
Sichuan Eucommia Bark should not be used in: Use only with professional guidance when low-back pain or bleeding during pregnancy needs emergency evaluation. Consult a qualified practitioner before use.
Does Sichuan Eucommia Bark interact with any medications?
Sichuan Eucommia Bark may interact with: Antihypertensive medications - theoretical additive blood-pressure-lowering effect. Always inform your healthcare provider of any herbal supplements you are taking.