Eden Apothecary · Herb Profile
Phellodendron amurense
Pronounced Phellodendron: fell-oh-DEN-dron. Phellodendron amurense: fell-oh-DEN-dron am-ur-EN-see. Huang Bai: hwahng BYE.
Cold and drying: an intensely bitter, berberine-rich bark that clears damp-heat and drains fire from the lower burner, cools the empty fire of spent Kidney water, and disinfects hot, damp, suppurating tissue.
Avoid. Huang Bai is a berberine-rich bark, and berberine crosses the placenta and displaces bilirubin from serum albumin; in the fetus and newborn this raises the risk of jaundice and kernicterus (bilirubin brain injury), a hazard considered serious enough that the berberine-containing herbs Coptis and Phellodendron were banned in Singapore for decades. Berberine is also reported to stimulate uterine contraction. Modern references (AHPA Botanical Safety Handbook, 2nd ed., which classes berberine-containing herbs as not for use in pregnancy; Mills and Bone, Principles and Practice of Phytotherapy; Chen and Chen, Chinese Medical Herbology and Pharmacology; Bensky, Clavey and Stoger, Materia Medica; Brinker, Herbal Contraindications and Drug Interactions) advise against use in pregnancy. There is no safe dose that justifies the fetal risk.
Avoid. Berberine passes into breast milk, and the nursing newborn, whose blood-brain barrier and bilirubin conjugation are immature, can suffer displaced bilirubin, jaundice, and kernicterus, a risk that is greatest in infants with G6PD deficiency. Chen and Chen, Bensky, Clavey and Stoger, and the AHPA Botanical Safety Handbook advise against maternal use of berberine-containing herbs while breastfeeding a newborn. Prefer better-studied, non-alkaloidal alternatives during lactation.
Not for infants; for older children only under professional supervision. Berberine is specifically contraindicated in neonates and jaundiced infants because it displaces bilirubin and can cause kernicterus, and it is hazardous in children with G6PD deficiency (hemolysis). In older children the intense bitter-cold readily chills digestion and causes loose stools. Reserve any pediatric use to a qualified practitioner, at low, short-course, damp-heat-specific dosing.
Intensely bitter and cold. Even short courses can chill and slow digestion, and prolonged or high-dose use damages the Spleen and Stomach, causing poor appetite, loose stools, and cold in the belly, so it is best given with warming, digestive-protective herbs or reserved for genuine damp-heat. The berberine-type alkaloids can provoke gastrointestinal upset in susceptible people. In anyone with glucose-6-phosphate dehydrogenase (G6PD) deficiency, berberine can precipitate hemolysis and must be avoided. Berberine also carries meaningful drug-interaction potential (see Drug Interactions).
Pregnancy and lactation (berberine risk; see safety fields). Neonates and infants, especially with jaundice or G6PD deficiency (kernicterus risk). Spleen and Stomach deficiency-cold and Kidney yang deficiency (TCM). Known G6PD deficiency. Concurrent cyclosporine, tacrolimus, and other narrow-therapeutic-index CYP3A4 or P-glycoprotein substrates without professional supervision.
A study in contrasts by species. The assigned Phellodendron amurense (Amur cork tree) is not threatened; it is widely cultivated as a street and shade tree and has become an invasive species in the woodlands of the northeastern United States (New York, Pennsylvania, Illinois, and beyond), where prolific female trees crowd out native oaks and hickories, so bark from managed or removed North American trees is an ecologically positive source. Its Chinese sister species Phellodendron chinense (Chuan Huang Bai), by contrast, is a nationally protected, endangered medicinal tree in southern China, heavily depleted by bark harvest, which girdles and can kill the tree. Prefer cultivated or plantation bark, confirm the species, and avoid wild-stripped P. chinense. Not listed by United Plant Savers (a North American native-plant registry).
Not in canonical biblical texts, and unknown to the ancient Mediterranean world; native to northeastern Asia (the Amur River region of China, plus Korea, Japan, and the Russian Far East). Its documented tradition is Chinese: it entered the materia medica in the Han-era Shen Nong Ben Cao Jing as Bo Mu / Huang Bai and was carried through every later Chinese and Japanese (Kampo, as Obaku) pharmacopoeia.
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