Eucommia bark (Duzhong)
Pharmaceutical Name: Cortex Eucommiae
Botanical Name: Eucommia ulmoides oliv.
Common Name: Eucommia bark
Source of Earliest Record: Shennong Bencao
Part Used: The bark is gathered in summer
and autumn. The rough bark is removed and
discarded, and then the smooth bark is dried
in the sun.
Natural Properties & Taste: Sweet and warm
Meridians: Liver and kidney
1. To tonify liver and kidneys and strengthen
bones and tendons;
2. To calm the fetus to prevent miscarriage
Indications & Combinations:
1. Deficiency of liver and kidneys manifested
as soreness and pain in the lower back and
knees. Eucommia bark (Duzhong) is used with
Psoralea fruit (Buguzhi) and Walnut seed (Hutaoren).
2. Impotence due to deficient kidneys. Eucommia
bark (Duzhong) is used with Dogwood fruit
(Shanzhuyu), Dadder seed (Tusizi) and Schisandra
3. Threatened abortion or restlessness of
fetus manifested as lower abdominal pain and
uterine bleeding. Eucommia bark (Duzhong)
is used with Teasel root (Xuduan) and Dioscorea
Dosage: 10-15 g
Cautions & Contraindications: The fried
herb is more effective than the raw herb.
Eucommia bark (Duzhong) is contraindicated
in cases with deficiency of yin with excessive