Ku Ding Cha
StarIlex kudingcha C.J. Tseng / Ilex latifolia Thunb.
☯ TCM Properties
Disperses Wind-Heat; Clears the Head and Brightens the Eyes; Generates Fluids and Relieves Thirst; Clears Heat and Resolves Toxicity; Resolves Phlegm and Stops Cough
Traditional Chinese Uses
Ku Ding Cha (bitter holly leaf tea, ligustrum or ilex leaf) is intensely bitter and cold, used in Chinese medicine to clear Heat from the head and upper body, settle Liver Yang and Fire, and dispel Wind-Heat. It addresses headaches, red eyes, sore throat, and hypertension associated with Liver Heat or Liver Yang rising. Modern research supports its cardiovascular benefits, including blood pressure-lowering and lipid-modifying effects. Despite its medicinal power, it is commonly consumed as a daily beverage tea.
Western Herbalism Properties
Botanical Description
Ilex kudingcha C.J.Tseng and the related Ilex latifolia Thunb. (Aquifoliaceae) are evergreen trees native to southern China, growing 8-20 m tall with smooth grey bark and stout twigs. The thick, leathery leaves are alternate, broadly elliptic to oblong, 10-25 cm long, with sharply serrate margins and a glossy dark-green upper surface. Small, dull-yellow, four-merous flowers cluster in axillary cymes and develop into red, globose drupes about 1 cm across. The species inhabits subtropical montane broadleaf forests in Yunnan, Guangxi, Sichuan, and Hainan. The large mature leaves are processed by rolling and drying to produce Ku Ding Cha (bitter nail tea), a markedly bitter, cooling beverage used in TCM and folk medicine to clear heat, dispel summer-heat, and brighten the head and eyes.
Active Constituents
Ursolic acid
Ursane-type triterpenoidConcentration: Characteristic aglycone; a major triterpenoid of the leaf
Anti-inflammatory, hepatoprotective and lipid-lowering pentacyclic triterpene; the free acid and its saponin conjugates are considered signature markers of Kudingcha.
Kudinosides (e.g. Kudinoside A)
Ursane triterpenoid saponinsConcentration: Principal saponins of Ilex latifolia / I. kudingcha leaf
Bitter triterpene saponins responsible for much of the tea's bitterness; show cholesterol-acyltransferase (ACAT) inhibition and hypolipidemic activity in vitro, and contribute to the heat-clearing, lipid-reducing reputation.
Chlorogenic acid
Phenolic acid (caffeoylquinic acid)Concentration: Major polyphenol of the leaf
Antioxidant, anti-inflammatory and mildly hypoglycemic phenolic acid; a key non-saponin marker of Kudingcha quality.
23-Hydroxyursolic acid
Ursane triterpenoidConcentration: Minor triterpenoid
Oxygenated ursane triterpene with antioxidant and vasoactive properties reported in Ilex species.
Ilekudinols A-C
TriterpenoidsConcentration: Species-specific minor triterpenoids
Characteristic triterpene constituents isolated from I. kudingcha; contribute to the plant's ACAT-inhibitory and lipid-modulating profile.
Rutin / Kaempferol glycosides
Flavonol glycosidesConcentration: Minor flavonoid fraction
Antioxidant flavonols that add to the total polyphenol content and vascular-protective activity of the tea.
27-p-Coumaroyloxyursolic acid
Acylated ursane triterpenoidConcentration: Minor characteristic triterpenoid
cis/trans coumaroyl esters of ursolic acid, distinctive to large-leaved Kudingcha, with reported anti-inflammatory and cytotoxic activity in screening assays.
⚠ Drug Interactions
Oral hypoglycemic agents / insulin
Kudingcha extracts lower blood glucose in preclinical and some clinical settings; combined with antidiabetic drugs this could produce additive glucose lowering and hypoglycemia.
Clinical note: Monitor blood glucose in diabetic patients and adjust antidiabetic dosing if needed.
Antihypertensive and lipid-lowering drugs
Meta-analysis data show Kudingcha lowers total and LDL cholesterol and it has mild blood-pressure-lowering effects; concurrent use with statins or antihypertensives may be mildly additive.
Clinical note: Generally additive and benign, but monitor lipids and blood pressure when combining with pharmacotherapy.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 6-15g | Daily | — | — | — |
Preparation Methods
Infusion (herbal tea)
Parts: Leaf
One or a few tightly rolled leaf 'nails' (about 1-3 g) are steeped in hot water and drunk as a bitter tea to clear heat, brighten the eyes and relieve thirst. The infusion can be re-steeped several times.
Water decoction
Parts: Leaf
In formal herbal use, 3-9 g of leaf is decocted to disperse wind-heat, clear the head and resolve phlegm. Because it is markedly cold and bitter, prolonged or high-dose use is avoided in those with Spleen/Stomach cold or deficiency.
Clinical Studies
Lipid-Lowering Efficacy of Kuding Tea in Patients With Metabolic Disorders: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Pooling 8 RCTs (716 patients), Kuding tea significantly reduced total cholesterol (-0.56 mmol/L), LDL-C (-0.29 mmol/L) and triglycerides (-0.30 mmol/L) versus controls, supporting a hypolipidemic benefit in metabolic disorders.
Chemical Composition, Bioactivity and Safety Aspects of Kuding Tea-From Beverage to Herbal Extract
Reviews the triterpene-saponin and polyphenol chemistry of Ilex latifolia / I. kudingcha and the evidence for lipid-lowering, weight-reducing, glucose-lowering, antioxidant and anti-inflammatory activity, together with safety considerations.
Historical Texts
Ben Cao Gang Mu Shi Yi (Supplement to the Compendium of Materia Medica), Zhao Xuemin
Qing dynasty, 1765Regional materia medica (e.g. Zhongguo Yaoyong Zhiwu Zhi and provincial herbals)
20th centuryReferences
- Wuepper S, Luersen K, Rimbach G. Chemical Composition, Bioactivity and Safety Aspects of Kuding Tea-From Beverage to Herbal Extract . Nutrients (2020) [DOI]
- Jiang Z, Lu Z, Wang T, Wang Y, Chu J, Chen K, Gao Z. Lipid-Lowering Efficacy of Kuding Tea in Patients With Metabolic Disorders: A Systematic Review and Meta-Analysis of Randomized Controlled Trials . Frontiers in Nutrition (2022) [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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