Zi Wan
StarAster tataricus L. f.
Traditionally used for
- Cough & breathing
Cautions & contraindications
- Pregnancy
- Young children
- Liver conditions
☯ TCM Properties
Moistens the Lungs and Descends Qi; Resolves Phlegm and Stops Cough; Warms the Lungs and Stops Cough; Descends Qi
Traditional Chinese Uses
Zi Wan (tatarian aster root) is a classic Lung herb recognized throughout TCM history for its warming yet moistening properties. It transforms phlegm and redirects Lung Qi downward to stop coughing, and remains appropriate for both acute and chronic coughs of various types — hot or cold, deficient or excess. Its reliable efficacy and non-drying nature make it one of the most widely applicable herbs for respiratory complaints.
Western Herbalism Properties
Relationships
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Botanical Description
Aster tataricus (Tatarian aster) is a tall, robust herbaceous perennial in the Asteraceae family, growing 1-1.5 m tall, native to grasslands, meadows, and forest margins of northeastern China, Korea, Japan, Mongolia, and the Russian Far East. Its rootstock is a short, knotty, horizontal rhizome bearing dense clusters of slender, twisted, purplish-brown fibrous roots that constitute the medicinal Zi Wan. The erect, ribbed, finely hairy stems bear alternate leaves: basal leaves long-petioled, elliptic-spatulate, 20-40 cm long, with toothed margins, withering by flowering time; stem leaves smaller, lanceolate, sessile. Numerous showy radiate flower heads 2.5-4 cm across, with violet-blue to lavender ray florets and yellow disc florets, are arranged in flat-topped corymbose panicles in late summer and autumn (POWO; Wikipedia).
Active Constituents
Shionone
Tetracyclic triterpene ketoneConcentration: The characteristic and most abundant triterpene of the root and rhizome; used as the pharmacopoeial identity and assay marker for Radix et Rhizoma Asteris
The chemical signature of authentic Zi Wan. Its biosynthesis has been traced to a dedicated oxidosqualene cyclase found in Aster tataricus, and because Ligularia roots sold as Shan Zi Wan do not contain it, its presence on thin-layer chromatography is the practical test that separates the correct drug from its substitutes.
Epifriedelinol
Friedelane triterpenoidA pentacyclic triterpene of the root reported repeatedly in the classical constituent studies of Aster tataricus and used alongside shionone in chromatographic quality control.
Astins A, B and C
Chlorinated cyclic pentapeptidesRing-A chlorinated cyclopentapeptides with antitumour activity in preclinical assay, and the most unusual chemistry in the drug. They are not conventional plant products: astin production in Aster tataricus is associated with the endophytic fungus Cyanodermella asteris, so astin content varies with the fungal colonisation of the individual plant rather than tracking cultivar or growing region.
Astins D to P
Chlorinated cyclic pentapeptidesA larger family of monochlorinated and dichlorinated cyclopentapeptide congeners isolated from the same root, which places astins among the very few chlorinated peptides in the materia medica.
Aster saponins
Oleanane-type triterpenoid saponinsThe main saponin group of the root and herb. Isolated aster saponins have shown anti-inflammatory activity in cell-based assay through NF-kappa B and MAPK signalling, which is consistent with the drug's traditional use for cough with phlegm but is not evidence in patients.
Shionosides A and B
Monoterpene glycosidesMonoterpene glycosides characterised from the root. They contribute to the chemical profile used for authentication rather than to any established pharmacological effect.
⚠ Drug Interactions
Shan Zi Wan or Chuan Zi Wan (Ligulariae Radix et Rhizoma, roots of Ligularia fischeri, L. intermedia, L. hodgsonii, L. sibirica and related species)
Aster tataricus root is the pharmacopoeial Zi Wan, but Ligularia roots are used and traded under the name Zi Wan, as Shan Zi Wan or Chuan Zi Wan, across parts of southwest, northwest and northeast China. That is a botanical substitution with a toxicological consequence: Ligularia species carry hepatotoxic pyrrolizidine alkaloids, and the alkaloid profile of Chuan Zi Wan (Ligulariae Radix et Rhizoma) has been characterised directly by liquid chromatography and mass spectrometry. Pyrrolizidine alkaloids are bioactivated in the liver to pyrrolic esters that damage sinusoidal endothelium, causing veno-occlusive disease; the injury is cumulative and can follow weeks of ordinary dosing. Aster tataricus itself contains no pyrrolizidine alkaloids.
Clinical note: Insist on Aster tataricus and on material identified by shionone rather than accepting anything sold as Zi Wan. Ligularia species are difficult to separate from one another on morphology, and chloroplast genome barcoding has been developed precisely because the visual identification is unreliable. Avoid the substitute entirely in pregnancy, in children, in liver disease, and in any prolonged course.
Cytotoxic chemotherapy and other agents with narrow therapeutic indices
The astins are cytotoxic cyclopentapeptides and their content in a given batch depends on fungal endophyte colonisation rather than on anything a dispenser can see or control. No pharmacokinetic or clinical interaction study exists, so this is a caution about batch-to-batch variability in a cytotoxic constituent, not a documented interaction.
Clinical note: There is no evidence of harm at customary decoction doses. Simply do not treat Zi Wan as chemically uniform in patients already on drugs where small changes in exposure matter.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 5–10 g | Daily | — | — | 中国药典 2020 【用法与用量】5～10g。 【性味与归经】辛，苦，温。归肺经。 — Chinese Pharmacopoeia 2020, quoted verbatim; route and cautions preserved. Replaces a cleared category-filler value. |
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Warm but moist, together they moisten the lungs, descend qi and stop cough without favoring cold or heat.
Lingering cough after an exterior condition with slight residual exterior pathogen.
Core pair of a classical formula — Zhi Sou San, Yi Xue Xin Wu (Cheng Guopeng, 1732)
Mutually reinforce moistening of the lungs, descending of qi and stopping of cough; one favors transforming phlegm, the other stopping cough.
Suited to cough of any kind, new or chronic, cold or heat.
Named pairing — Zhong Yao Xue national textbook, pei wu discussion
Evidence Tier
Moderate evidence · 8 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
0
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
0
In vitro / animal
8
3 verified · 5 unverified
Show 8 studies
- Expectorant, antitussive, anti-inflammatory activities and compositional analysis of Aster tataricus
- Anti-inflammatory Potential of Saponins from Aster tataricus via NF-κB/MAPK Activation
- Identification of potential inflammatory inhibitors from Aster tataricus
- Structures and conformation of antitumour cyclic pentapeptides, astins A, B and C, from Aster tataricus
- Astins K–P, six new chlorinated cyclopentapeptides from Aster tataricus
- Molecular characterization of an oxidosqualene cyclase that yields shionone, a unique tetracyclic triterpene ketone of Aster tataricus
- Pyrrolizidine alkaloid profile in a traditional Chinese herbal medicine Chuan Zi Wan (Ligulariae Radix et Rhizoma) by liquid chromatography/electrospray ionization ion trap mass spectrometry
- Identification of Ligularia Herbs Using the Complete Chloroplast Genome as a Super-Barcode
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Expectorant, antitussive, anti-inflammatory activities and compositional analysis of Aster tataricus
Tests Aster tataricus extracts and fractions in mouse models of cough and sputum production alongside a compositional analysis of the material used. It is the most direct preclinical support for the traditional expectorant and antitussive indication, and it remains an animal study; no controlled human trial of Zi Wan has been published.
Anti-inflammatory Potential of Saponins from Aster tataricus via NF-κB/MAPK Activation
Isolates triterpenoid saponins from Aster tataricus and characterises their anti-inflammatory effects on NF-kappa B and MAPK signalling in cell culture.
Identification of potential inflammatory inhibitors from Aster tataricus
Screens constituents of Aster tataricus for inhibition of inflammatory mediators in cell-based assay and identifies the active compounds.
Structures and conformation of antitumour cyclic pentapeptides, astins A, B and C, from Aster tataricus
Establishes the structures and solution conformations of the three principal astins and reports their antitumour activity. This is the work that identified the chlorinated cyclopeptides as the distinctive chemistry of the drug.
Astins K–P, six new chlorinated cyclopentapeptides from Aster tataricus
Extends the astin series with six further chlorinated cyclopentapeptides from the same root, showing that the peptide chemistry of Zi Wan is considerably more complex than the three originally described compounds.
Molecular characterization of an oxidosqualene cyclase that yields shionone, a unique tetracyclic triterpene ketone of Aster tataricus
Identifies the enzyme responsible for shionone biosynthesis in Aster tataricus, confirming shionone as a species-specific product and supporting its use as an authentication marker against Ligularia substitutes.
Pyrrolizidine alkaloid profile in a traditional Chinese herbal medicine Chuan Zi Wan (Ligulariae Radix et Rhizoma) by liquid chromatography/electrospray ionization ion trap mass spectrometry
Profiles the pyrrolizidine alkaloids present in Ligulariae Radix et Rhizoma, the material traded as Chuan Zi Wan. It documents the hepatotoxic alkaloid burden that a Ligularia substitution introduces into a prescription written for Aster tataricus.
Identification of Ligularia Herbs Using the Complete Chloroplast Genome as a Super-Barcode
Develops chloroplast genome barcoding to distinguish Ligularia species, undertaken because these herbs are hard to identify morphologically and because some of them carry pyrrolizidine alkaloids. It is indirect evidence of how unreliable visual identification of Zi Wan substitutes is in the trade.
Historical Texts
Shen Nong Ben Cao Jing (Divine Husbandman's Classic of the Materia Medica)
Han dynasty, compiled by about 200 CEJin Gui Yao Lue (Essential Prescriptions of the Golden Cabinet), Zhang Zhongjing
Han dynasty, about 220 CEMing Yi Bie Lu (Miscellaneous Records of Famous Physicians), attributed to Tao Hongjing
Six Dynasties period, about 500 CEBen Cao Gang Mu (Compendium of Materia Medica), Li Shizhen
Ming dynasty, 1596References
- Li Ke-Jie; Liu Yang-Yang; Wang Dong; Yan Pei-Zheng; Lu De-Chao; Zhao Dong-Sheng. Radix Asteris: Traditional Usage, Phytochemistry and Pharmacology of An Important Traditional Chinese Medicine . Molecules (2022) [DOI]
- Zhang Xinyi; Liu Meiqi; Zhang Xiaozhuang; Ma Lengleng; Song Shiyi; Pan Meitong; Huang Shumin; Ren Weichao; Ma Wei. Aster tataricus L. f.: a review on the botany, phytochemistry, ethnopharmacology, pharmacology, toxicology and comprehensive utilization . Frontiers in Pharmacology (2025) [DOI]
- NAGAO Tsuneatsu; HACHIYAMA Shizuko; OKABE Hikaru; YAMAUCHI Tatsuo. Studies on the constituents of Aster tataricus L.f.II. Structures of aster saponins isolated from the root. . Chemical and Pharmaceutical Bulletin (1989) [DOI]
- NAGAO TSUNEATSU; OKABE HIKARU; YAMAUCHI TATSUO. Studies on the constituents of Aster tataricus L. f. I. Structures of shionosides A and B, monoterpene glycosides isolated from the root. . Chemical and Pharmaceutical Bulletin (1988) [DOI]
- Uka Valdet; Tang Shen; Gulder Tobias A.M.. MSMS-based molecular networking and fragmentation patterns reveal new insights into the astins chemodiversity from the fungal endophyte Cyanodermella asteris . Phytochemistry Letters (2025) [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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