Gan Jiang
StarZingiber officinale Rosc.
Traditionally used for
- Cough & breathing
- Digestion
- Bowel health
Cautions & contraindications
- Bleeding disorders
- Diabetes
☯ TCM Properties
Warms the Interior and Dispels Cold; Restores Yang and unblocks the channels; Warms the Lungs and Transforms Phlegm-Fluids; Warms the Channels and Stops Bleeding
Traditional Chinese Uses
Gan Jiang (dried ginger) occupies a central position among warming herbs in Chinese medicine. Unlike fresh ginger, which acts primarily at the body's surface, dried ginger penetrates deeply to restore warmth to the interior — particularly the Spleen, Stomach, and Lung. It is the principal herb for cold-induced abdominal pain, vomiting, and diarrhea, and it is also effective for chronic cough with thin, watery phlegm. Its ability to revive Spleen Yang and dispel cold makes it essential in formulas for Yang deficiency.
Western Herbalism Properties
Pharmacological Effects
- Antiemetic: Aqueous extract inhibited cupric sulfate-induced vomiting.
- Gastroprotective: Oral 10% decoction reduced acidity of 0.6N HCl and protected gastric mucosa in rats.
- Central stimulant: Alcoholic extract stimulated vasomotor and respiratory centres in anesthetized cats.
- Antimicrobial: Decoction inhibited Trichophyton violaceum in vitro and was lethal to Trichomonas vaginalis.
Source: Zhu YP. Chinese Materia Medica: Chemistry, Pharmacology and Applications. Harwood Academic, 1998, p. 352.
Relationships
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Botanical Description
Zingiber officinale Roscoe (Zingiberaceae) is a herbaceous tropical perennial growing 0.6 to 1.2 meters tall from a thick, branched, aromatic rhizome. The leafy aerial pseudostems bear distichous, lanceolate leaves 15 to 30 cm long with sheathing bases. Flowers are produced on separate scapes arising from the rhizome in cone-like spikes of imbricate green bracts; the small yellow-green flowers have a purple, cream-spotted labellum. The species is native to tropical Asia and cultivated globally for its rhizome. In traditional Chinese medicine, Gan Jiang refers to the mature rhizome that has been cured and dried, typically harvested in autumn or winter when the plant has died back. Drying intensifies the warming, drying and dispersing qualities of the rhizome relative to the fresh form (Sheng Jiang); Gan Jiang is regarded as more deeply warming to the interior, particularly the Spleen, Stomach and Lung, and is used as a separate substance from fresh ginger in Chinese materia medica.
Active Constituents
6-Gingerol
Gingerol (phenolic alkanone)Concentration: Major pungent principle of the fresh/dried rhizome; partly converted to shogaols on drying
The dominant pungent phenol of ginger, with anti-inflammatory, antioxidant, antiemetic and prokinetic activity. In dried ginger (Gan Jiang), a portion of the gingerols dehydrates to shogaols, giving the dried drug a hotter, more interior-warming character than fresh ginger.
6-Shogaol
Shogaol (dehydrated gingerol)Concentration: Elevated in dried rhizome relative to fresh (formed by dehydration of 6-gingerol)
Formed when gingerols lose water during drying and heating; more pungent and often more potent than 6-gingerol in anti-inflammatory and antiemetic assays. Its enrichment underlies why dried ginger is classified as hot and used to warm the interior and rescue devastated yang.
Zingerone
Vanillyl ketoneConcentration: Minor; increases with prolonged heating/drying
A less pungent degradation product of gingerols with antioxidant, anti-inflammatory and antidiarrheal activity.
Zingiberene
Sesquiterpene (essential oil)Concentration: Principal sesquiterpene of the volatile oil (oil ~1-3% of rhizome)
The main component of ginger essential oil, contributing the aroma and carminative, antispasmodic and mild antimicrobial actions.
beta-Bisabolene
Sesquiterpene (essential oil)Concentration: Component of the volatile oil
An essential-oil sesquiterpene contributing to the carminative and warming, aromatic properties of the rhizome.
beta-Sesquiphellandrene
Sesquiterpene (essential oil)Concentration: Component of the volatile oil
A volatile sesquiterpene with reported antiviral and antioxidant activity that adds to the aromatic profile of ginger oil.
10-Gingerol
Gingerol homologueConcentration: Minor pungent constituent
A higher homologue of the gingerol series sharing anti-inflammatory and antimicrobial activity.
⚠ Drug Interactions
Warfarin and other anticoagulants
Ginger constituents inhibit thromboxane synthesis and platelet aggregation and may affect warfarin pharmacodynamics, potentially increasing anticoagulant effect and bleeding risk at higher intakes.
Clinical note: Use caution and monitor INR/bleeding when medicinal doses of dried ginger are combined with warfarin, heparin or antiplatelet drugs; case reports of raised INR exist though controlled data are mixed.
Antidiabetic agents (insulin, sulfonylureas, metformin)
Ginger can lower fasting glucose and improve insulin sensitivity, which may add to the glucose-lowering effect of antidiabetic medication.
Clinical note: Monitor blood glucose when medicinal ginger is combined with hypoglycemic drugs and adjust dosing to avoid hypoglycemia.
Nifedipine / antihypertensive agents
Ginger has been shown to potentiate the antiplatelet effect of nifedipine and has mild antihypertensive and calcium-channel-modulating activity, which could add to antihypertensive drugs.
Clinical note: Generally minor at dietary doses; monitor blood pressure and bleeding tendency with medicinal doses.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 3–10 g | Daily | — | — | 中国药典 2020 【用法与用量】3～10g。 【性味与归经】辛，热。归脾、胃、肾、心、肺经。 — Chinese Pharmacopoeia 2020, quoted verbatim; route and cautions preserved. Replaces a cleared category-filler value. |
Preparation Methods
Dried ginger (Gan Jiang) decoction
Parts: dried rhizome
Mature rhizome dried and sliced; decocted at 3-10 g. Warms the spleen and stomach, dispels interior cold and warms the lungs to transform thin phlegm; core herb of Li Zhong Wan and, with Fu Zi, of Si Ni Tang to rescue devastated yang.
Blast-fried / carbonized ginger (Pao Jiang, Gan Jiang Tan)
Parts: dried rhizome
Dried ginger stir-fried at high heat until scorched or charred. This milder, more astringent form warms the channels and stops bleeding, used for cold-type uterine bleeding and abdominal pain; charring tempers the acrid dispersing quality.
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Hot drastic purging combined with warming of the middle, which expels cold accumulation from the stomach and intestines.
Acute cold accumulation with sudden abdominal distention and pain and constipation. Ba Dou is highly toxic; contraindicated in pregnancy and weak patients; incompatible with Qian Niu Zi (nineteen antagonisms).
Core pair of a classical formula — San Wu Bei Ji Wan, Jin Gui Yao Lue (Zhang Zhongjing)
Astringing the intestines combined with warming the middle, the pair treats chronic cold-type dysentery with pus and blood.
Traditionally with Jing Mi (non-glutinous rice). Not for damp-heat dysentery.
Core pair of a classical formula — Tao Hua Tang, Shang Han Lun (Zhang Zhongjing)
Spleen and lung yang are warmed while the middle is tonified, treating cold in the lung and middle burner.
Core pair of a classical formula — Gan Cao Gan Jiang Tang, Shang Han Lun (Zhang Zhongjing)
Two warming rhizomes that together strongly warm the stomach and disperse cold, stopping cold epigastric pain and vomiting.
Cold in the stomach with epigastric pain and vomiting of clear fluid.
Core pair of a classical formula — Er Jiang Wan, Tai Ping Hui Min He Ji Ju Fang
Two acrid-hot herbs that together strongly warm the middle burner, disperse cold and stop severe abdominal pain.
Severe epigastric and abdominal cold pain with vomiting and inability to eat.
Core pair of a classical formula — Da Jian Zhong Tang, Jin Gui Yao Lue (Zhang Zhongjing)
Acrid opening combined with bitter descending, which unblocks focal distention in the epigastrium from mixed heat and cold and harmonises the stomach.
Epigastric focal distention with nausea, vomiting and borborygmus from mixed cold and heat.
Core pair of a classical formula — Ban Xia Xie Xin Tang, Shang Han Lun (Zhang Zhongjing)
The middle burner is warmed and cold dispelled while spleen qi is tonified, treating deficiency cold of spleen and stomach.
Core pair of a classical formula — Li Zhong Wan, Shang Han Lun (Zhang Zhongjing)
A warm, pungent dispersing herb paired with a sour astringent one: the combination warms and transforms cold fluids in the Lung while restraining leakage of Lung qi, so dispersing does not injure qi and astringing does not trap the pathogen.
Classic for cough and wheezing with copious thin, watery sputum from cold thin mucus, as in Xiao Qing Long Tang.
Named pairing — Lu Jingshan, Shi Jinmo Dui Yao; Bensky et al., Chinese Herbal Medicine: Materia Medica
Aconite rescues and restores yang throughout the body while dried ginger warms the middle; together they strongly restore devastated yang, and the ginger is said to increase aconite's warming while reducing its toxicity.
Yang collapse with cold limbs, faint pulse and diarrhoea with undigested food. Aconite is toxic; use processed root only, properly decocted; contraindicated in pregnancy.
Core pair of a classical formula — Si Ni Tang, Shang Han Lun (Zhang Zhongjing)
Evidence Tier
Strong 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
1
1 verified · 0 unverified
Randomized controlled trial
1
1 verified · 0 unverified
Other clinical trial
0
Observational / case report
0
In vitro / animal
0
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
Ginger (Zingiber officinale) reduces acute chemotherapy-induced nausea: a URCC CCOP study of 576 patients
In 576 cancer patients, ginger supplementation (0.5-1.5 g/day) begun three days before chemotherapy significantly reduced the severity of acute chemotherapy-induced nausea compared with placebo, with the 0.5 g and 1.0 g doses most effective.
Efficacy of ginger for nausea and vomiting: a systematic review of randomized clinical trials
Early systematic review of randomized trials concluding that ginger is a promising antiemetic, with data supporting benefit over placebo for postoperative and pregnancy-related nausea and vomiting, while calling for larger confirmatory trials.
⚠ Safety & Contraindications
- Bleeding disorders
- Diabetes
Contraindications
Its use is prohibited in patients with yin deficiency and internal heat, and bleeding due to blood heat.
Source: Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 161–167.
Historical Texts
Shen Nong Ben Cao Jing (Divine Husbandman's Classic of the Materia Medica)
Han dynasty (c. 200 CE)Shang Han Lun / Jin Gui Yao Lue by Zhang Zhongjing
Eastern Han dynasty (c. 200 CE)Ben Cao Gang Mu (Compendium of Materia Medica) by Li Shizhen
Ming dynasty (1578)References
- Ryan JL, Heckler CE, Roscoe JA, et al.. Ginger (Zingiber officinale) reduces acute chemotherapy-induced nausea: a URCC CCOP study of 576 patients . Supportive Care in Cancer (2012) [DOI]
- Chinese Pharmacopoeia Commission. Zingiberis Rhizoma (Gan Jiang) monograph . Pharmacopoeia of the People's Republic of China, 2020 Edition, Vol. I (2020) [DOI]
- Bensky D, Clavey S, Stoger E. Chinese Herbal Medicine: Materia Medica, 3rd Edition (Gan Jiang entry) . Eastland Press, Seattle (2004) [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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