Zhi Zi
StarGardenia jasminoides Ellis
☯ TCM Properties
Clears Heat and Eliminates Irritability; Clears Heat and Promotes Urination; Clears Damp-Heat and Resolves Jaundice; Cools the Blood and Stops Bleeding; Resolves Toxicity; Reduces Swelling and Alleviates Pain
Traditional Chinese Uses
Xiao Hui Xiang (fennel seed) is a warm, sweet-pungent herb that disperses cold and moves Qi, primarily in the lower burner. Its main indications are cold-type lower abdominal pain, hernia pain, orchitis from cold invasion of the Liver channel, and digestive discomfort from cold stagnation. It is also commonly used as a culinary spice, and its warming, Qi-moving properties make it a useful food medicine for cold digestion and poor appetite in cold weather.
Western Herbalism Properties
Used In Formulas (3)
Botanical Description
Gardenia jasminoides (Zhi Zi, cape jasmine) is an evergreen shrub in the Rubiaceae family, typically growing 1 to 3 meters tall, with smooth grayish bark and opposite, lustrous dark green, lanceolate to elliptic leaves 5 to 15 centimeters long with prominent venation and conspicuous interpetiolar stipules. The fragrant flowers are solitary, terminal, with a tubular calyx bearing 5 to 8 narrow lobes and a salverform corolla 5 to 7 centimeters across, white at first and aging cream-yellow, with a sweet jasmine-like scent. The fruits, the part used medicinally, are oblong-elliptic to obovate berries 1.5 to 3.5 centimeters long, ripening from green to a striking orange-yellow or reddish-orange, with 5 to 9 prominent longitudinal ridges and persistent calyx lobes at the apex. Inside, the pulp is yellow and contains numerous flattened reddish-orange seeds yielding the crocin pigments responsible for the dye and the bitter, cooling medicinal action. Native to East Asia, widely cultivated.
Active Constituents
Geniposide
Iridoid glycosideConcentration: ~3-6% of dried fruit (principal marker)
The dominant iridoid glycoside of Fructus Gardeniae and its Pharmacopoeia quality marker. Geniposide shows hepatoprotective, choleretic, anti-inflammatory, hypoglycemic, hypolipidemic, antioxidant and antidepressant activity; it lowers serum ALT/AST in liver-injury models. Notably it is dose-dependent: high or prolonged doses can themselves be hepatotoxic.
Genipin
Iridoid aglyconeConcentration: Trace (hydrolysis product of geniposide)
The aglycone released when gut flora hydrolyze geniposide. Genipin rapidly inhibits mitochondrial uncoupling protein 2 (UCP2), potentiating insulin secretion, and mediates much of the anti-inflammatory and neuroprotective action; it is also a natural cross-linking agent.
Gardenoside
Iridoid glycosideConcentration: Minor
A secondary iridoid contributing to the herb's anti-inflammatory and choleretic effects and used together with geniposide as a chemical fingerprint of authentic gardenia fruit.
Crocin-1 (crocins)
Crocetin diester (carotenoid glycoside)Concentration: ~1-3% (yellow pigment fraction)
The water-soluble yellow carotenoid pigments that give the fruit its dye value. Crocins are antioxidant, anti-inflammatory, hepatoprotective and neuroprotective, and lower serum transaminases in chemically induced liver injury.
Crocetin
Apocarotenoid (dicarboxylic acid)Concentration: Minor (crocin hydrolysis product)
The absorbable aglycone of crocin, showing antioxidant, anti-atherosclerotic and antithrombotic activity and improved oxygen diffusion in tissue.
Chlorogenic acid
Phenolic acid (caffeoylquinic acid)Concentration: Minor
A phenolic antioxidant contributing to free-radical scavenging and anti-inflammatory activity of the fruit.
Ursolic acid
Pentacyclic triterpenoidConcentration: Trace
A triterpene acid with anti-inflammatory, hepatoprotective and mild anti-microbial properties present in the fruit.
⚠ Drug Interactions
Hepatotoxic drugs (e.g., high-dose acetaminophen, methotrexate)
Geniposide, the main constituent, produces dose- and time-dependent hepatic injury in animal models. Co-administration with other hepatotoxic agents could theoretically add to liver stress.
Clinical note: Use lower doses for shorter courses and monitor liver function when combined with hepatotoxic medications.
Antidiabetic agents (insulin, sulfonylureas)
Geniposide/genipin enhance insulin secretion (UCP2 inhibition) and improve glucose handling, which could add to the effect of hypoglycemic drugs.
Clinical note: Monitor blood glucose if used alongside antidiabetic therapy.
Anticoagulant / antiplatelet drugs (warfarin, aspirin)
Crocetin and related carotenoids show antithrombotic/antiplatelet activity in preclinical studies, which could theoretically augment anticoagulant therapy.
Clinical note: Watch for signs of bleeding when combined with anticoagulants; interaction not clinically confirmed.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 6-15g | Daily | — | — | — |
Preparation Methods
Water decoction (raw)
Parts: dried ripe fruit
Crush 6-10 g of the dried ripe fruit and decoct in water. The raw fruit is favored to clear heat, drain damp-heat and relieve irritability (e.g., in Zhi Zi Chi Tang).
Charred / stir-fried (Zhi Zi Tan)
Parts: dried ripe fruit
Dry-fry the fruit until scorched brown-black to make Zhi Zi Tan, which strengthens the blood-cooling and bleeding-stopping action while moderating the cold, bitter nature.
Topical paste
Parts: dried ripe fruit
Grind the fruit to powder, mix with egg white, flour or vinegar and apply externally to reduce swelling, bruising and traumatic pain.
Clinical Studies
Effective Therapeutic Verification of Crocin I, Geniposide, and Gardenia (Gardenia jasminoides Ellis) on Type 2 Diabetes Mellitus In Vivo and In Vitro
Gardenia extract and its isolated compounds crocin I and geniposide improved glucose tolerance, insulin resistance and lipid profiles in a type 2 diabetes model, supporting the traditional damp-heat clearing use of the fruit in metabolic disease.
Comparative Evaluation of Hepatoprotective Activities of Geniposide, Crocins and Crocetin by CCl4-Induced Liver Injury in Mice
Geniposide, crocins and crocetin each significantly lowered serum ALT, AST and ALP in carbon-tetrachloride-injured mice, giving mechanistic support to the herb's classic use for damp-heat jaundice and liver protection.
Historical Texts
Shen Nong Ben Cao Jing (Divine Husbandman's Classic of Materia Medica)
Han dynasty (c. 200 CE)Shang Han Lun (Treatise on Cold Damage)
Eastern Han (c. 200-220 CE), Zhang ZhongjingBen Cao Gang Mu (Compendium of Materia Medica)
Ming dynasty, 1578, Li ShizhenReferences
- Chinese Pharmacopoeia Commission. Pharmacopoeia of the People's Republic of China (Fructus Gardeniae, Zhi Zi) . China Medical Science Press (2020) [DOI]
- Chen P, Chen Y, Wang Y, Cai S, Deng L, Liu J, Zhang H. Comparative Evaluation of Hepatoprotective Activities of Geniposide, Crocins and Crocetin by CCl4-Induced Liver Injury in Mice . Biomolecules & Therapeutics (Seoul) (2016) [DOI]
- Zhou H, Zhang S, Chen L, Liu Y, Shen L, Zhang J. Effective Therapeutic Verification of Crocin I, Geniposide, and Gardenia (Gardenia jasminoides Ellis) on Type 2 Diabetes Mellitus In Vivo and In Vitro . Foods (2023) [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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