Jiao Mu
StarZanthoxylum bungeanum Maxim. or Zanthoxylum schinifolium Sieb. et Zucc.
Traditionally used for
- Cough & breathing
- Digestion
- Urinary & fluids
Cautions & contraindications
- Pregnancy
☯ TCM Properties
Promotes Urination and Reduces Edema; Resolves Phlegm-Fluid Retention; Drains Water and Reduces Edema
Traditional Chinese Uses
Jiao Mu (Sichuan pepper seed) is cold in nature, in distinct contrast to the warm, numbing husk from the same plant. Its principal action is promoting urination and draining excess water from the body, making it useful for conditions of fluid retention, edema, and urinary difficulty caused by water accumulation. Classical formulas used it specifically for abdominal fluid retention and breathlessness accompanying pleural effusion.
Western Herbalism Properties
Relationships
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Botanical Description
Zanthoxylum bungeanum (Chinese prickly ash, Sichuan pepper) is a deciduous shrub or small tree in the Rutaceae family, growing 3-7 m tall, with stems and branches bearing stout, broad-based prickles. The leaves are alternate, pinnately compound, 8-15 cm long, with 5-11 ovate to elliptic-lanceolate, finely crenate leaflets that are aromatic when crushed and dotted with translucent oil glands. The small unisexual flowers are yellowish-green and borne in dense terminal panicles. The fruit is a reddish-brown, rugose, glandular follicle 4-5 mm wide that dehisces along a single suture to expose one shiny, hard, blue-black to jet-black seed; Jiao Mu refers specifically to this dried mature seed, distinct from the aromatic pericarp (Hua Jiao) used as a culinary spice (POWO; Wikipedia).
Active Constituents
Seed fixed oil
Triacylglycerol fixed oilConcentration: Roughly 27 to 31 percent of the seed by weight, of which about 90 percent is polyunsaturated fatty acid
The seed, not the pericarp, is the oil-bearing part of the fruit, and the fixed oil is what distinguishes Jiao Mu chemically from Hua Jiao. Comparative analysis of the fruit found total fatty acids of about 108 mg per gram in the pericarp against about 332 mg per gram in the seed and 966 mg per gram in the expressed seed oil.
Most modern pharmacology attributed to Jiao Mu is pharmacology of this oil.
alpha-Linolenic acid
Omega-3 polyunsaturated fatty acidConcentration: Reported at roughly 17 to 24 percent of the seed
The principal characterised active of the seed. Isolated from Zanthoxylum bungeanum seeds it showed antithrombotic activity in rodent models, prolonging clotting parameters and reducing thrombus formation.
Its abundance is why the seed has attracted interest as an omega-3 oilseed independent of any traditional indication.
Linoleic acid
Omega-6 polyunsaturated fatty acidConcentration: Major fatty acid of the seed oil alongside alpha-linolenic and oleic acids
A bulk structural fatty acid of the oil rather than an agent with a distinct traditional action; it is reported abundant in pericarp, seed and seed oil alike.
Oleic acid
Monounsaturated fatty acidConcentration: Major fatty acid of the seed oil
Together with linoleic and alpha-linolenic acids it makes up the bulk of the expressed oil, contributing to its physical properties rather than to a specific pharmacological effect.
Hydroxy-alpha-sanshool
Unsaturated alkylamideConcentration: A pericarp constituent, present in the seed only through incomplete separation from the pericarp
Listed here to mark a boundary rather than to claim it for the drug. Hydroxy-alpha-sanshool is the alkylamide responsible for the tingling numbness of Hua Jiao and is a constituent of the pericarp, which is a different item of materia medica from the seed.
Its presence in a sample of Jiao Mu indicates pericarp carry-over, and evidence generated on sanshool, including its hypolipidaemic and antiobesity effects in rats, belongs to the pericarp and must not be read across to the seed.
⚠ Drug Interactions
Anticoagulants and antiplatelet drugs
alpha-Linolenic acid isolated from Zanthoxylum bungeanum seeds has demonstrated antithrombotic activity in rodent models, and the seed is unusually rich in it. Omega-3 fatty acids as a class have a recognised, dose-related antiplatelet effect. The evidence for the herb is preclinical; there are no human interaction studies and no case reports.
Clinical note: Take a bleeding history and be cautious in patients on warfarin, direct oral anticoagulants, aspirin or clopidogrel, particularly if a concentrated seed oil rather than the crude seed is used. Mention the herb before surgery. Ordinary decoction quantities of the crude seed are unlikely to be clinically significant on their own.
Hua Jiao (Pericarpium Zanthoxyli, the pericarp of the same fruit)
Jiao Mu is the seed and Hua Jiao is the pericarp of the same fruit, separated after drying. They are separate drugs with different actions: the seed drains water and reduces oedema, the pericarp warms the middle burner, disperses cold and kills parasites. Because separation is a mechanical step in processing, incompletely dehusked seed, or whole fruit supplied as Jiao Mu, delivers the pericarp's alkylamides and volatile oil instead of, or as well as, the seed.
This is not a toxicological emergency, but it substitutes a warm, acrid, drying, numbing drug for a water-draining one, which inverts the intended action in a patient being treated for fluid accumulation. Hua Jiao also carries the traditional caution in pregnancy and in yin deficiency with heat that Jiao Mu does not.
Clinical note: Inspect the material: Jiao Mu should be uniform small, shiny, black seeds, without the reddish-brown split husk of Hua Jiao and without the tingling numbness on the tongue that the pericarp produces. Reject lots supplied as whole fruit.
Other Zanthoxylum species substituted for the Pharmacopoeia species
The drug is officially the seed of Zanthoxylum bungeanum or Zanthoxylum schinifolium, but the genus is large and several congeners are used regionally and traded interchangeably. Almost all published phytochemistry and pharmacology of the seed has been generated on Zanthoxylum bungeanum; Zanthoxylum schinifolium seed is far less characterised, and other species less still.
Clinical note: Prefer material identified to Zanthoxylum bungeanum where the evidence base matters, and treat seed from unspecified Zanthoxylum species as a traditional drug without modern characterisation rather than as an equivalent.
Evidence Tier
Moderate evidence · 4 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
4
0 verified · 4 unverified
Show 4 studies
- Anti-thrombotic effects of α-linolenic acid isolated from Zanthoxylum bungeanum Maxim seeds
- Inhibitory effect of Zanthoxylum bungeanum seed oil on ovalbumin-induced lung inflammation in a murine model of asthma
- Zanthoxylum bungeanum Seed Oil Attenuates LPS-Induced BEAS-2B Cell Activation and Inflammation by Inhibiting the TLR4/MyD88/NF-κB Signaling Pathway
- Analysis and evaluation of resourceful chemical compositions in different parts of Zanthoxylum bungeanum fruit and its seed oil
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
Anti-thrombotic effects of α-linolenic acid isolated from Zanthoxylum bungeanum Maxim seeds
alpha-Linolenic acid isolated from the seeds of Zanthoxylum bungeanum showed antithrombotic activity in rodent thrombosis models, with effects on clotting parameters and thrombus formation.
Directly on the seed, which is unusual in this literature; it is an animal and isolated-compound study, not a trial of the crude drug.
Inhibitory effect of Zanthoxylum bungeanum seed oil on ovalbumin-induced lung inflammation in a murine model of asthma
In ovalbumin-sensitised mice, Zanthoxylum bungeanum seed oil at 2 g/kg attenuated lung tissue injury and airway remodelling and reduced eosinophil and leukocyte infiltration, with lower expression of inflammatory cytokines and chemokines.
Supports a respiratory application of the seed oil in a murine asthma model; it is preclinical and uses the expressed oil rather than the decocted seed.
Zanthoxylum bungeanum Seed Oil Attenuates LPS-Induced BEAS-2B Cell Activation and Inflammation by Inhibiting the TLR4/MyD88/NF-κB Signaling Pathway
In lipopolysaccharide-stimulated BEAS-2B human bronchial epithelial cells, Zanthoxylum bungeanum seed oil reduced inflammatory activation, which the authors attribute to inhibition of TLR4/MyD88/NF-kappaB signalling.
Cell-culture mechanism study offering a candidate pathway for the murine asthma finding. It is a single in vitro report in a journal with a poor record for editorial rigour, and carries correspondingly little weight.
Analysis and evaluation of resourceful chemical compositions in different parts of Zanthoxylum bungeanum fruit and its seed oil
Comparative compositional analysis of pericarp, seed and expressed seed oil of Zanthoxylum bungeanum, reporting total fatty acid contents of roughly 108, 332 and 966 mg per gram respectively, with oleic, linoleic and alpha-linolenic acids abundant throughout.
This is the analytical basis for treating the seed and the pericarp as distinct drugs rather than interchangeable parts of one fruit.
Historical Texts
Jin Gui Yao Lue (Essential Prescriptions of the Golden Cabinet), Zhang Zhongjing
Eastern Han dynasty, c. 220 CEMing Yi Bie Lu (Miscellaneous Records of Famous Physicians)
Attributed to Tao Hongjing, c. 500 CEBen Cao Gang Mu (Compendium of Materia Medica), Li Shizhen
Ming dynasty, 1578, printed 1596Ben Cao Qiu Zhen (Seeking Truth in the Materia Medica), Huang Gongxiu
Qing dynasty, 1769References
- Zhang M, Wang J, Zhu L, Li T, Jiang W, Zhou J, Peng W, Wu C. Zanthoxylum bungeanum Maxim. (Rutaceae): A Systematic Review of Its Traditional Uses, Botany, Phytochemistry, Pharmacology, Pharmacokinetics, and Toxicology . International Journal of Molecular Sciences (2017) [DOI]
- Wen J, Xiang Q, Guo J, Zhang J, Yang N, Huang Y, Chen Y, Hu T. Pharmacological activities of Zanthoxylum L. plants and its exploitation and utilization . Heliyon (2024) [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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