Evodia Fruit Classic Formulas — Natural Herb Library

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Warms the middle and stops vomiting - Wu Yu is used for nausea, retching, cold-type epigastric pain, and rebellious Stomach qi when cold is the core problem.
Disperses Liver cold and alleviates pain - it is a classic herb for vertex headache, hernial pain, cold abdominal pain, and menstrual pain rooted in cold stagnation.
Directs rebellious qi downward - formulas use it for acid regurgitation, sour swallowing, and cold-constrained Liver-Stomach disharmony.
Warms the Spleen and Kidney and stops dawn diarrhea - it appears when deficiency cold causes early-morning loose stool with cramping and exhaustion.

Wu Zhu Yu Tang - classic formula for cold-deficiency headache, vomiting, and epigastric discomfort with rebellious qi.
Zuo Jin Wan - famous Liver-Stomach formula pairing Huang Lian with a small dose of Wu Zhu Yu for acid regurgitation and heat-cold complexity.
Si Shen Wan - dawn-diarrhea formula using Wu Zhu Yu to warm the middle and help secure chronic leakage.

Me and Qi describes Wu Zhu Yu as a hot, bitter-pungent herb entering the Liver, Spleen, Stomach, and Kidney to stop vomiting, warm the interior, and relieve cold pain.
Traditional materia medica consistently warns that its powerful hot nature makes it inappropriate for heat patterns, yin deficiency, or reckless self-use.