Zhi Zi
StarGardenia jasminoides Ellis
Traditionally used for
- Nose & throat
- Cough & breathing
- Digestion
- Urinary & fluids
- Sleep
- Mood & calm
- Pain & joints
- Liver & jaundice
☯ 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
Zhi Zi (栀子) is the ripe fruit of Gardenia jasminoides Ellis (Rubiaceae), Fructus Gardeniae. It is bitter and cold, entering the Heart and Lung channels and reaching the Triple Burner, Stomach and Liver. It clears Heat and eliminates irritability, drains Damp-Heat through urination, resolves jaundice, cools the Blood to stop bleeding, resolves toxicity, and reduces swelling.
It is the principal herb for the restless, agitated state left by lingering Heat in the chest — irritability, a stifling sensation below the heart, and insomnia — the pattern of Zhi Zi Chi Tang. With Yin Chen it forms the core of Yin Chen Hao Tang for Damp-Heat jaundice. It cools Blood-level Heat in nosebleed, blood in the urine and coughing of blood, and crushed raw it is applied externally to sprains, contusions and hot swellings.
The part and preparation matter: the peel is said to act more on the exterior and surface Heat, the kernel on Heat in the interior; charred Zhi Zi (Zhi Zi Tan) is used when the aim is to stop bleeding rather than to drain Fire. It is cold and readily loosens the stool, so it is used cautiously where the Spleen is deficient and the appetite poor.
Western Herbalism Properties
Used In Formulas (15)
Relationships
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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, or powder/pills | 6–10 g | Daily | — | — | 中国药典 2020 【用法与用量】6～10g。外用生品适量，研末调敷。 【性味与归经】苦，寒。归心、肺、三焦经。 — Chinese Pharmacopoeia 2020, quoted verbatim; route and cautions preserved. Replaces a cleared category-filler value. |
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.
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Clearing heat through the three burners is combined with gently dispersing and lifting, releasing constrained heat in the chest and relieving irritability.
Restlessness, irritability and chest oppression with insomnia after a febrile illness.
Core pair of a classical formula — Zhi Zi Chi Tang, Shang Han Lun (Zhang Zhongjing)
Clearing heat through the three burners is combined with clearing damp-heat from the lower burner, treating damp-heat jaundice with heat predominant.
Core pair of a classical formula — Zhi Zi Bai Pi Tang, Shang Han Lun (Zhang Zhongjing)
Clearing constrained fire through the three burners is joined with cooling the blood, so heat arising from liver qi constraint is cleared from both the qi and blood levels.
Added to Xiao Yao San for liver constraint that has transformed into heat: irritability, flushing, early or heavy menses, hot sensations.
Core pair of a classical formula — Dan Zhi Xiao Yao San, Nei Ke Zhai Yao (Xue Ji)
Clearing damp-heat and relieving jaundice is combined with draining heat through urination, together clearing damp-heat jaundice more effectively.
Yang-type jaundice with bright yellow skin.
Core pair of a classical formula — Yin Chen Hao Tang, Shang Han Lun (Zhang Zhongjing)
Evidence Tier
Limited evidence · 2 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
2
0 verified · 2 unverified
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
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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