Eden Apothecary · Herb Profile
Gardenia jasminoides
Pronounced Gardenia: gar-DEE-nee-uh. Gardenia jasminoides: gar-DEE-nee-uh jas-min-OY-deez. Zhi Zi: jr dz (roughly 'jrr-dzuh').
Cold and drying: an intensely bitter fruit that drains fire from all three burners, quiets the restless heat and irritability of the Heart, clears damp-heat jaundice from the Liver, cools reckless heat-bleeding, and disperses fire-toxin sores and traumatic swelling.
Use only under qualified professional supervision; avoid for self-care. Zhi Zi is a bitter, cold, fire-draining and blood-cooling herb, and this bitter-cold, Blood-cooling class is used cautiously in pregnancy because it can chill the Spleen and injure the Blood, both readily depleted in pregnancy, and because its high-dose hepatotoxicity (geniposide and genipin) argues against casual use. Modern references (Chen and Chen, Chinese Medical Herbology and Pharmacology; Bensky, Clavey and Stoger, Chinese Herbal Medicine: Materia Medica, 3rd ed.) restrict it to short-course, low-dose use within a balanced formula prescribed by a practitioner for a genuine acute heat pattern. Routine or prolonged use should be avoided. The isolated food colorant gardenia blue has passed in-utero safety testing, but that does not license medicinal fruit dosing in pregnancy.
Caution; limited data. There is little modern data on transfer of Zhi Zi constituents into breast milk, and its cold nature could disturb an infant's digestion, so prolonged or high-dose maternal use should be avoided during lactation. Short courses of low doses within a balanced formula, under professional supervision, are the outer limit of prudent use. Prefer better-studied, gentler alternatives while nursing (Chen and Chen; Bensky, Clavey and Stoger).
Only under qualified supervision, at low, short-course, heat-specific doses. The intense bitter-cold readily chills a child's digestion and causes loose stools, and the dose-dependent hepatotoxicity of geniposide and genipin makes careful dosing important. Zhi Zi does appear in traditional pediatric heat formulas, but pediatric use should be left to a qualified practitioner rather than undertaken casually (Chen and Chen; Bensky, Clavey and Stoger).
Bitter, cold, and drying. Even short courses can chill and slow a weak digestion, bringing loose stools and poor appetite, so it is best combined with digestive-protective herbs or reserved for genuine heat and damp-heat. Its iridoid constituents geniposide and genipin are hepatotoxic at high doses in animal studies (dose- and time-dependent, and reversible on withdrawal), so Zhi Zi should be kept to customary doses and courses, not taken in large amounts or for long periods, and used cautiously alongside other hepatically stressful agents (see Drug Interactions). Standard therapeutic doses have not shown hepatotoxicity.
Spleen and Stomach deficiency-cold, Kidney yang deficiency, and cold-pattern diarrhea (TCM). Frank Yin or Blood deficiency without heat excess. High-dose or prolonged use, especially in pre-existing liver disease, given the dose-dependent hepatotoxicity of geniposide and genipin. Pregnancy and lactation except under professional supervision (see safety fields).
Not at risk. Gardenia jasminoides is one of the most widely cultivated ornamental shrubs worldwide and is grown as a commercial crop in southern China for both its medicinal fruit and its natural yellow and blue food pigments, so the fruit is a cultivated, renewable, non-wildcrafted resource. Prefer fruit from cultivated sources. Not listed by United Plant Savers (a North American native-plant registry).
Not in canonical biblical texts and unknown to the ancient Mediterranean world; native to China and East Asia (also the Himalaya, Indochina, and Japan). Its documented tradition is Chinese: the fruit entered the materia medica in the Han-era Shen Nong Ben Cao Jing as Zhi Zi and runs through every later Chinese pharmacopoeia. Known in English as cape jasmine, the fruit also yields a classical yellow dye and food colorant (crocin, the 'gardenia yellow' of East Asian cooking), of the same pigment family as saffron.
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