Mu Gua
StarChaenomeles speciosa (Sweet) Nakai
Traditionally used for
- Digestion
- Pain & joints
Cautions & contraindications
- Kidney conditions
- Allergy risk
☯ TCM Properties
Relaxes the Sinews and Unblocks the Collaterals; Transforms Dampness and Harmonizes the Stomach; Calms the Liver; Promotes Digestion and Resolves Food Stagnation
Traditional Chinese Uses
Mu Gua (Chinese quince fruit) is a warming, sour-flavored herb especially prized for its capacity to ease muscle stiffness, relax tendons, and relieve cramping in the limbs — particularly the legs and lower body. It is a primary herb for Wind-Damp conditions causing joint and muscle pain, and its Liver-nourishing properties make it valuable for cramp-type pain and spasms. It also harmonizes the Stomach and helps resolve conditions associated with dampness in the middle burner.
Western Herbalism Properties
Pharmacological Effects
- Immunologic: Oral decoction 25 g/kg for 8 days reduced spleen index in mice; i.p. extract 85 mg/kg reduced peritoneal macrophage phagocytosis.
- Antitumor: 25% aqueous extract i.p. (0.5 ml/mouse) inhibited Ehrlich ascites carcinoma, lymphosarcoma and sarcoma 180 in mice.
- Antibacterial and antiinflammatory: Decoction inhibited Bacillus dysenteriae, Diplococcus pneumoniae and staphylococci in vitro and egg white-induced paw edema in mice.
Source: Zhu YP. Chinese Materia Medica: Chemistry, Pharmacology and Applications. Harwood Academic, 1998, p. 269.
Relationships
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Botanical Description
Chaenomeles speciosa, the flowering quince or Mu Gua, is a deciduous, densely branched, often spiny shrub in the Rosaceae, native to central and eastern China and widely cultivated as an ornamental and medicinal plant. The shrub grows 1 to 2.5 meters tall, with rigid, spreading branches, smooth purplish-brown young bark and stout thorns on the older shoots. The alternate, simple leaves are ovate to oblong-lanceolate, 3 to 9 cm long, with a sharply serrate margin, a glossy dark green upper surface and a paler glabrous underside; the stipules at the base of the petiole are conspicuous, kidney-shaped to ovate and persistent. Flowers appear before or with the leaves in early spring, in clusters of two to six along the older wood, 3 to 5 cm across, with five rounded petals in shades of brilliant scarlet, deep red or sometimes pink to white, surrounding many yellow stamens. The fruit is a hard, fragrant, oblong to ovoid pome 4 to 9 cm long, yellow-green ripening to deep yellow with a waxy surface, which is sliced and dried to produce the medicinal drug Mu Gua.
Active Constituents
Oleanolic acid
Pentacyclic triterpenoid (oleanane type)Concentration: One of the two marker triterpenoids used to standardise the dried fruit, quantified by HPLC alongside ursolic acid
Anti-inflammatory and hepatoprotective triterpene that, with ursolic and betulinic acid, carries much of the anti-arthritic activity attributed to the fruit in preclinical models. It also contributes to the radical-scavenging capacity measured in fruit extracts.
Ursolic acid
Pentacyclic triterpenoid (ursane type)Concentration: The second HPLC marker triterpenoid of the fruit
Anti-inflammatory triterpene identified as a principal contributor to the DPPH radical-scavenging activity of the fruit and to the anti-inflammatory targets predicted and then verified experimentally for Chaenomeles Fructus in rheumatoid arthritis models.
Betulinic acid
Pentacyclic triterpenoid (lupane type)Concentration: Present with oleanolic and ursolic acid among the active organic acid fraction of the fruit
Anti-inflammatory triterpene named with oleanolic and ursolic acid as one of the constituents underlying the traditional use of the fruit for damp painful obstruction and for diarrhoea.
Chlorogenic acid
Hydroxycinnamic acid ester (phenolic acid)Concentration: One of five phenolic acids quantified in the fruit by HPLC, with vanillic, gallic, ferulic and p-coumaric acids
The constituent identified as the main contributor to the alpha-glucosidase inhibitory activity of the fruit extract, and an antioxidant in its own right. It is the basis of the blood-sugar-lowering activity reported in preclinical work.
Malic acid
Aliphatic organic acidConcentration: A dominant organic acid of the fruit, responsible with citric and tartaric acid for its pronounced sourness
The high free organic acid load gives the drug its sour taste, its traditional Stomach-harmonising and digestive action, and its capacity to lower the pH of a preparation. It is also the reason the fruit is astringent and irritating in excess.
Rutin
Flavonol glycosideConcentration: Quantified in the fruit by HPLC with catechin and epicatechin
Antioxidant flavonol glycoside contributing to the free-radical scavenging and vascular effects reported for fruit extracts.
Catechin and epicatechin
Flavan-3-olsConcentration: Quantified together with rutin in the fruit by HPLC
Flavan-3-ol antioxidants of the fruit; part of the polyphenol fraction responsible for the antioxidant and antimicrobial activity of aqueous and alcoholic extracts.
Chaenomeles speciosa polysaccharides
PolysaccharideConcentration: A high-molecular-weight fraction obtained from the fruit; content depends on extraction method
The polysaccharide fraction was analgesic and anti-arthritic in rodent models, indicating that the activity of the fruit is not confined to its small-molecule triterpenes and phenolics. Alcohol-precipitated preparations therefore differ in composition from a plain decoction.
⚠ Drug Interactions
Carica papaya (papaya fruit, papaya leaf, papain supplements)
Mu Gua is routinely rendered into English as papaya because the modern Chinese word mu gua is used in everyday speech for Carica papaya, while the medicinal drug Fructus Chaenomelis is the fruit of Chaenomeles speciosa, a rose-family quince with no botanical relationship to papaya. The two have entirely different chemistry: Chaenomeles carries triterpene acids, phenolic acids and free organic acids, whereas papaya carries the proteolytic enzymes papain and chymopapain and benzyl isothiocyanate. Papain in particular has its own interaction profile, including reports of potentiated warfarin effect and enzyme allergy, none of which belongs to Chaenomeles.
Clinical note: Check the binomial on the label, not the English name. A patient told to take papaya, or given a papain enzyme product in place of Mu Gua, is not taking this herb; and papain-related bleeding or allergy risks must not be transferred onto Chaenomeles, nor Chaenomeles data used to reassure a patient taking papain.
Chaenomeles sinensis (Guang Pi Mu Gua, Ming Zha)
Chaenomeles sinensis fruit is the commonest commercial stand-in for Chaenomeles speciosa and is sold under the same trade name. Comparative analyses of the two fruits show they differ quantitatively in triterpene and phenolic content, so the substitute is chemically related but not equivalent, and the anti-arthritic and antioxidant data generated on C. speciosa cannot be assumed to transfer.
Clinical note: Where dose matters, specify Chaenomeles speciosa. C. sinensis fruit is larger, smoother-skinned and less puckered, and material that does not match the wrinkled, halved, dark-red-brown appearance of true Mu Gua should be queried.
Allopurinol and febuxostat
Bioassay-guided work on the fruit isolated constituents that inhibit xanthine oxidase in vitro, the same enzyme target as allopurinol and febuxostat. The effect is an in vitro finding at concentrations that a food-level or decoction-level intake is unlikely to reach in plasma, so any additive urate-lowering is expected to be small.
Clinical note: No dose change is needed, but if the herb is being used long-term in a gout patient, recheck serum urate after starting rather than assuming no contribution.
Oral antidiabetic drugs (acarbose, metformin, sulfonylureas)
Chlorogenic acid from the fruit inhibits alpha-glucosidase in vitro, the mechanism acarbose uses, and blood-sugar-lowering activity is reported for the fruit in preclinical models. Human data are absent, so this is a mechanistic expectation and not a demonstrated clinical effect.
Clinical note: Reasonable to advise ordinary glucose self-monitoring when a diabetic patient begins a long course, without anticipating a dose change.
Acid-labile and pH-dependent oral drugs
The drug is markedly sour because of a high free content of malic, citric and tartaric acids, and this is a defining organoleptic feature rather than an incidental one. A strongly acidic gastric bolus can in principle degrade acid-labile agents and can affect enteric-coated preparations, though no interaction study exists for this herb.
Clinical note: Separate the dose from enteric-coated or acid-labile medicines by a couple of hours. Also relevant in reflux and gastric ulcer, where classical sources already caution against excessive sour drugs.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 6–9 g | Daily | — | — | 中国药典 2020 【用法与用量】6～9g。 【性味与归经】酸，温。归肝、脾经。 — 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.
Together they transform dampness, harmonize the stomach and relax the sinews, treating vomiting and diarrhea with cramping of the calves.
Damp-heat sudden turmoil disorder with muscle cramps.
Core pair of a classical formula — Can Shi Tang, Huo Luan Lun (Wang Shixiong)
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
1 verified · 3 unverified
Show 4 studies
- Analgesic and Anti-Arthritic Activities of Polysaccharides in Chaenomeles speciosa
- Deciphering the pharmacological mechanisms of Chaenomeles Fructus against rheumatoid arthritis by integrating network pharmacology and experimental validation
- Bioassay-Guided Isolation and Identification of Xanthine Oxidase Inhibitory Constituents from the Fruits of Chaenomeles speciosa (Sweet) Nakai
- Antioxidant, Anti-Inflammatory and Anti-Influenza Properties of Components from Chaenomeles speciosa
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
Analgesic and Anti-Arthritic Activities of Polysaccharides in Chaenomeles speciosa
Polysaccharide fractions prepared from the fruit of Chaenomeles speciosa were tested in rodent pain and arthritis models. The polysaccharides were analgesic and reduced arthritic changes, showing that the anti-arthritic activity of the drug is carried in part by a macromolecular fraction and not only by the triterpene acids used as HPLC markers.
Deciphering the pharmacological mechanisms of Chaenomeles Fructus against rheumatoid arthritis by integrating network pharmacology and experimental validation
Network pharmacology predicted the constituents and targets by which Chaenomeles Fructus might act in rheumatoid arthritis, and the predictions were then tested experimentally. Oleanolic, betulinic and ursolic acid emerged as the principal active constituents acting on inflammatory signalling. This is target-level mechanistic support, not clinical evidence of benefit in patients.
Bioassay-Guided Isolation and Identification of Xanthine Oxidase Inhibitory Constituents from the Fruits of Chaenomeles speciosa (Sweet) Nakai
Fractionation of the fruit guided by a xanthine oxidase inhibition assay identified the constituents responsible for that activity, providing a mechanistic rationale for the traditional use of the drug in gouty and rheumatic conditions. The work is enzymatic and cell-free; no animal or human urate data are reported.
Antioxidant, Anti-Inflammatory and Anti-Influenza Properties of Components from Chaenomeles speciosa
Isolated components of Chaenomeles speciosa were screened for antioxidant, anti-inflammatory and anti-influenza activity in cell-based and biochemical assays, with several constituents active in more than one assay. The findings are preclinical and do not support clinical use of the fruit against influenza.
⚠ Safety & Contraindications
- Kidney conditions
- Allergy risk
Contraindications
Its use is prohibited in patients with internal constraint heat, scanty and reddish urine, and not suitable for patients with weakness of waist and knee due to essence and blood deficiency, and kidney yin insufficiency.
Source: Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 105–112.
Historical Texts
Er Ya (The Ready Rectifier)
Compiled by the early Han dynasty, third to second century BCEMing Yi Bie Lu (Supplementary Records of Famous Physicians)
Attributed to Tao Hongjing, circa 500 CELei Gong Pao Zhi Lun (Master Lei's Treatise on Drug Processing)
Attributed to Lei Xiao, Liu Song dynasty, fifth century CEBen Cao Gang Mu (Compendium of Materia Medica)
Ming dynasty, 1596References
- Huang Weifeng; He Junwei; Nisar Muhammad Farrukh; Li Hongshui; Wan Chunpeng. Phytochemical and Pharmacological Properties of Chaenomeles speciosa: An Edible Medicinal Chinese Mugua . Evidence-Based Complementary and Alternative Medicine (2018) [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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