Bai Zhu
StarAtractylodes macrocephala Koidz.
☯ TCM Properties
Tonifies Qi and Strengthens the Spleen; Dries Dampness; Promotes Urination and Reduces Edema; Astringes to Stop Sweating; Calms the Fetus
Traditional Chinese Uses
Bai Zhu (white atractylodes rhizome) is a warm, sweet-bitter herb and one of the most important Spleen-tonifying herbs in Chinese medicine. It strengthens Spleen Qi and dries Dampness to relieve chronic diarrhea, bloating, poor appetite, and fatigue from Spleen Qi deficiency with Dampness. It is also used to calm the fetus in threatened miscarriage from Spleen deficiency, and it consolidates Wei Qi to reduce spontaneous sweating. Together with codonopsis root, it forms the core of Spleen-Qi tonifying formulas.
Western Herbalism Properties
Used In Formulas (10)
Botanical Description
Atractylodes macrocephala is a herbaceous perennial in the Asteraceae, native to eastern China and cultivated extensively in Zhejiang, Anhui, Jiangxi and Hunan provinces. Plants grow 30-80 cm tall from a thick, knotty, aromatic rhizome that branches irregularly and is yellowish-brown outside with cream-coloured flesh. The erect, often reddish stems bear alternate, deeply pinnately divided to lobed leaves with sharply serrate, spiny-toothed margins and conspicuous reticulate venation. From late summer into autumn the plant produces solitary, terminal capitula 2-3 cm across, with purplish to white tubular florets enclosed in overlapping, pectinate, bristly involucral bracts. The fruit is a small achene topped with a feathery pappus. It favours well-drained, sunny mountain slopes and forest margins between 600 and 2,500 m elevation and is propagated commercially from seedlings, the rhizomes being lifted in autumn of the second year.
Active Constituents
Atractylenolide I
Sesquiterpene lactone (eudesmanolide)Concentration: Minor volatile-oil constituent, typically ~0.01-0.3% of dried rhizome
Principal bioactive sesquiterpene lactone of Bai Zhu. Exerts anti-inflammatory activity by suppressing the TLR4/NF-κB and PI3K/Akt signaling pathways, mitigates cancer-associated cachexia and muscle wasting, and shows immunomodulatory and antitumor effects (in part via JAK2/STAT3 inhibition). Considered a key marker for pharmacological activity of the rhizome.
Atractylenolide II
Sesquiterpene lactone (eudesmanolide)Concentration: Trace to minor component of the volatile oil
Structurally related to atractylenolide I with more limited anti-inflammatory potency. Promotes apoptosis in tumor cells through the PI3K/Akt and Ras/ERK pathways and contributes to gastroprotective and lipid-regulating effects of the rhizome.
Atractylenolide III
Sesquiterpene lactone (eudesmanolide)Concentration: Trace to minor component of the volatile oil
Hydroxylated atractylenolide with antioxidant, anti-inflammatory and neuroprotective activity. Attenuates oxidative stress and inflammatory cytokine release and shows multi-organ (cardiac, renal, hepatic, pulmonary, gastrointestinal) protective effects in preclinical models.
Atractylone
Sesquiterpene (volatile oil)Concentration: A principal component of the rhizome essential oil
Major volatile-oil sesquiterpene contributing to the aromatic character of Bai Zhu. Displays anti-inflammatory and gastrointestinal regulatory activity and modulates gastric motility, consistent with the herb's traditional spleen-strengthening and dampness-drying actions.
Biatractylolide
Dimeric sesquiterpenoid lactoneConcentration: Minor constituent
Dimeric sesquiterpene lactone unique to Atractylodes with notable neuroprotective activity; protects neurons against oxidative and excitotoxic injury in vitro, of interest for neurodegenerative applications.
Atractylodes macrocephala polysaccharides (AMP)
PolysaccharideConcentration: Major water-soluble fraction of the rhizome (several percent of dry weight)
Water-soluble glucans and heteropolysaccharides that underlie much of the tonic activity. Immunomodulatory (activating macrophages, T/B lymphocytes and cytokine secretion), gastroprotective, prebiotic and hematopoietic; also implicated in intestinal-barrier protection and anti-fatigue effects.
β-Eudesmol
Sesquiterpene alcohol (volatile oil)Concentration: Constituent of the essential oil
Volatile sesquiterpenoid with reported anti-inflammatory, gastro-regulatory and antiangiogenic activity; contributes, with atractylone, to the pharmacological profile of the rhizome's essential oil.
⚠ Drug Interactions
Warfarin and other anticoagulant/antiplatelet drugs
Atractylenolides and volatile-oil components exhibit antiplatelet activity in preclinical studies, which could theoretically add to the effect of anticoagulant or antiplatelet drugs. No human case reports have been documented.
Clinical note: Clinically significant interaction is unproven; monitor for bleeding only with high, sustained doses of concentrated extracts.
Antidiabetic agents (insulin, sulfonylureas)
Atractylodes polysaccharides show hypoglycemic and insulin-sensitizing effects in animal models, which could be additive with glucose-lowering medication.
Clinical note: Theoretical only; routine blood-glucose monitoring is sufficient in diabetic patients using tonic doses.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 9-30g | Daily | — | — | — |
Preparation Methods
Raw / unprocessed (sheng Bai Zhu) decoction
Parts: rhizome
Dried rhizome sliced and decocted, typically 6-12 g per day. The raw herb more strongly dries dampness and promotes urination; used for dampness, edema and profuse sweating.
Bran-fried / dry-fried (chao or fu-chao Bai Zhu)
Parts: rhizome
Rhizome slices stir-fried, often with wheat bran, until yellow and aromatic. This processing enhances the spleen-strengthening and Qi-tonifying action and reduces the herb's drying/greasy quality; preferred for Spleen-Qi deficiency with poor appetite and loose stools.
Charred (jiao Bai Zhu)
Parts: rhizome
Stir-fried until scorched brown. Used to strengthen the astringent, diarrhea-arresting action for chronic Spleen-deficiency diarrhea.
Clinical Studies
The traditional uses, phytochemistry, and pharmacology of Atractylodes macrocephala Koidz.: A review
Comprehensive review of the botany, traditional uses, phytochemistry, pharmacology, pharmacokinetics and toxicology of Bai Zhu. Attributes the herb's activity chiefly to sesquiterpenoids, polysaccharides and polyacetylenes, and documents gastrointestinal-regulating, immunomodulatory, anti-inflammatory, anti-cancer and neuroprotective effects.
Chemical Constitution, Pharmacological Effects and the Underlying Mechanism of Atractylenolides: A Review
Focused review of atractylenolides I-III, summarizing anti-inflammatory (TLR4/NF-κB, PI3K/Akt), anti-cancer (JAK2/STAT3), multi-organ protective, and metabolic (glucose/lipid, antiplatelet, blood-pressure) actions and their molecular mechanisms.
Historical Texts
Shennong Bencao Jing (Divine Farmer's Materia Medica)
Eastern Han dynasty, c. 200 CEMing Yi Bie Lu (Miscellaneous Records of Famous Physicians), attrib. Tao Hongjing
Southern dynasties, c. 500 CEBencao Gangmu (Compendium of Materia Medica), Li Shizhen
Ming dynasty, 1596References
- Zhu B, Zhang QL, Hua JW, Cheng WL, Qin LP. The traditional uses, phytochemistry, and pharmacology of Atractylodes macrocephala Koidz.: A review . Journal of Ethnopharmacology 226:143-167 (2018) [DOI]
- Xie Z, Lin M, He X, Dong Y, Chen Y, Li B, Chen S, Lv G. Chemical Constitution, Pharmacological Effects and the Underlying Mechanism of Atractylenolides: A Review . Molecules 28(10):3987 (2023) [DOI]
- Chinese Pharmacopoeia Commission. Baizhu (Atractylodis Macrocephalae Rhizoma), Pharmacopoeia of the People's Republic of China, Vol. I . China Medical Science Press (2020) [DOI]
- Bensky D, Clavey S, Stoger E. Chinese Herbal Medicine: Materia Medica, 3rd ed. . Eastland Press, Seattle (2004) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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