About This Herb*
Traditional Chinese Medicine background and properties
Herb Description*
Du Zhong (Eucommia bark) is one of the most important herbs in Chinese medicine for strengthening the lower back and knees. It nourishes the Liver and Kidney systems, which govern bones and tendons, making it a go-to remedy for chronic back pain, weak joints, and age-related musculoskeletal decline. It is also used to support healthy pregnancies and has a mild blood-pressure lowering effect.
Herb Category*
Main Actions*
- Nourishes Liver and Kidney Yin
- Strengthens the Sinews and Bones
- Calms the Fetus
- Lowers Blood Pressure
How These Actions Work*
'Tonifies the Liver and Kidneys' means Dù Zhòng replenishes the Kidney and Liver systems, which in TCM govern the bones and sinews respectively. When these organ systems are depleted, a person may experience chronic low back pain, weak or aching knees, frequent urination, impotence, or dizziness. Du Zhong's warm, sweet nature directly nourishes the Kidney Yang and Liver Blood that sustain the lower body's structural integrity. It is considered a primary herb for Kidney-deficiency type lower back pain, and classical texts describe it as the go-to herb whenever the lumbar region is involved.
'Strengthens sinews and bones' follows directly from its Liver and Kidney tonifying action. Since the Liver governs sinews and the Kidneys govern bones, when these organs are well-nourished, the musculoskeletal framework becomes strong and resilient. This action is applied clinically for weak knees, difficulty walking, stiffness, or conditions where bones and tendons need support, such as recovery from fractures or in degenerative joint conditions.
'Calms the fetus' means Du Zhong stabilizes pregnancy in cases where the mother's Liver and Kidney systems are weak. In TCM, the Kidneys and the Chōng and Rèn vessels are responsible for holding the fetus in place. When these are deficient, symptoms such as lower back aching during pregnancy, vaginal bleeding, or a sensation of the fetus being restless may occur. Du Zhong's tonifying and securing nature addresses this root deficiency. It can be used alone or combined with herbs like Xù Duàn (Teasel root) and Sāng Jì Shēng (Mulberry mistletoe).
'Aids in lowering blood pressure' reflects modern clinical observation. Du Zhong has been shown to have a mild, sustained blood-pressure lowering effect, likely through central mechanisms and vascular relaxation. The salt-processed form and decoctions tend to have stronger effects than tinctures. It is often used as a supporting herb in formulas for hypertension, particularly when high blood pressure accompanies Liver and Kidney deficiency patterns.
Patterns Addressed*
In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Du Zhong is traditionally associated with these specific patterns.
The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.
Why Du Zhong addresses this pattern
Du Zhong is warm and sweet, entering the Kidney channel directly. Its warmth replenishes Kidney Yang, the fundamental warming and activating force of the body. When Kidney Yang is deficient, the lower back (the 'mansion of the Kidneys') loses its structural support, leading to chronic soreness and cold sensations. Du Zhong's tonifying nature directly addresses this root deficiency, strengthening the lumbar region and restoring the Kidney's ability to govern the bones. Its gentle warmth makes it suitable for long-term use without being overly drying or hot.
A practitioner would look for one or more of these signs
Chronic, dull aching that worsens with fatigue or cold
Especially at night, with clear copious urine
From Kidney Yang depletion
Weak, cold, or soft knees
Why Du Zhong addresses this pattern
Du Zhong enters both the Liver and Kidney channels. In TCM, the Liver governs the sinews (tendons and ligaments) and the Kidneys govern the bones. When both are depleted, the entire musculoskeletal framework weakens. Du Zhong's sweet taste tonifies and nourishes these two organ systems simultaneously, restoring strength to the structural tissues of the lower body. This dual action makes it uniquely suited for conditions where both sinew and bone problems coexist, such as weak knees with lower back pain, or difficulty walking with generalized weakness in the legs.
A practitioner would look for one or more of these signs
With concurrent knee weakness
From Liver-Kidney insufficiency
Legs feel heavy and weak
Why Du Zhong addresses this pattern
When the mother's Kidney system is weak, the Chōng and Rèn extraordinary vessels (which nourish and secure the fetus) lack the support they need. Du Zhong's warm, tonifying nature strengthens the Kidney foundation and stabilizes these vessels. Its specific affinity for the lower body and lumbar region directly addresses the lower back pain and heaviness that often accompanies threatened miscarriage. Classical texts record that Du Zhong can be used as a single herb for this purpose, though it is more commonly paired with Xù Duàn and Sāng Jì Shēng for stronger effect.
A practitioner would look for one or more of these signs
Restless fetus with lower back aching
Light bleeding with sensation of downward pressure
During pregnancy, with a heavy dragging sensation
TCM Properties*
Warm
Sweet (甘 gān)
Bark (皮 pí / 树皮 shù pí)
This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.