Jie Geng
StarPlatycodon grandiflorum (Jacq.) A. DC.
Traditionally used for
- Nose & throat
- Cough & breathing
Cautions & contraindications
- Heart conditions
☯ TCM Properties
Diffuses Lung Qi; Expels Phlegm; Benefits the Throat; Expels Pus; Reaches the Vertex of the Head
Traditional Chinese Uses
Jie Geng (platycodon root, balloon flower root) is a neutral, bitter-pungent herb that opens the Lung, transforms Phlegm, and serves as a "boat herb" that carries other herbs upward to the Lung and upper body. It is used for both hot and cold coughs — clearing and transforming hot Phlegm for yellow, sticky sputum and warming and dissolving cold Phlegm for clear, copious sputum. It also opens abscesses in the Lung and throat and relieves sore throat and hoarseness. Its directing function makes it an important synergist in respiratory formulas.
Western Herbalism Properties
Used In Formulas (13)
Relationships
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Botanical Description
Platycodon grandiflorus, commonly known as balloon flower, Chinese bellflower or by its Chinese name Jie Geng, is a perennial herb in the family Campanulaceae native to eastern Asia, including China, Korea, Japan and far-eastern Russia. It is the sole species in its genus. The plant grows from a thick, fleshy, white taproot 30 to 80 cm tall on erect, glabrous, somewhat glaucous stems. The leaves are alternate to subopposite or whorled, ovate to lanceolate, with sharply toothed margins. Its most distinctive feature is the flower bud, which inflates like a small balloon before splitting open to reveal a broadly bell-shaped, upward-facing flower 4 to 7 cm across with five pointed lobes; the colour is typically deep blue-violet, though pink and white forms are common in cultivation. Flowers are borne singly or in few-flowered cymes in mid to late summer. The fleshy root is the part used in traditional East Asian medicine, where it is known as Jie Geng and is also eaten as a vegetable in Korean cuisine under the name doraji.
Active Constituents
Platycodin D
Oleanane-type triterpenoid saponinConcentration: The principal saponin of the root and the marker compound for the drug; 89 saponins have been characterised in the species out of 219 reported constituents
Carries most of the drug's documented activity: expectorant and antitussive, anti-inflammatory, antiviral, antioxidant, anti-obesity and antitumour in preclinical models. It is also haemolytic, and it is a potent immunological adjuvant with both Th1 and Th2 activity when injected. Its oral bioavailability is low, and can be raised by co-prescription with Glycyrrhiza uralensis or by reformulation. Clinical translation has not happened: the pharmacology is essentially all cell and animal work.
Deapioplatycodin D
Oleanane-type triterpenoid saponinConcentration: A desugared congener of platycodin D present in the root
Showed anti-coronaviral activity against SARS-CoV-2 in a screen of natural products for dual viral target inhibition. In vitro only.
Platycodin D3
Oleanane-type triterpenoid saponinConcentration: One of the major platycosides of the root alongside platycodin D
Shares the surfactant and membrane-active properties of the platycodin series. Its individual pharmacology is much less characterised than that of platycodin D.
Polygalacin D
Oleanane-type triterpenoid saponinConcentration: A further major saponin of the root, differing from platycodin D at the aglycone
Contributes to the total saponin content that determines both the expectorant effect and the gastric irritancy of the drug.
Platycodigenin
Triterpenoid sapogeninConcentration: The aglycone shared by the platycodin series, released by deglycosylation
Formed when gut bacteria strip the sugar chains from the platycosides. The aglycone is the form in which most of the saponin fraction actually enters the circulation after oral dosing, which is why oral and parenteral administration of this drug have entirely different toxicology.
Inulin-type polysaccharides
Fructan polysaccharideConcentration: Twenty-one polysaccharides have been characterised in the species; the root is a starchy vegetable in Korean and Chinese cuisine
The bulk carbohydrate of the root, fermented in the colon. Responsible for the drug being an ordinary food as well as a medicine, and for much of its immunomodulatory activity in cell assays.
⚠ Drug Interactions
Injectable and intravenous herbal preparations containing this root
Platycodin D has recognised haemolytic activity, which is a property of the intact glycoside interacting with the erythrocyte membrane. That matters only if the saponin reaches the blood unchanged. Taken by mouth it does not: the platycosides are poorly absorbed and are deglycosylated by gut flora to platycodigenin, so haemolysis is not an oral hazard and the drug has a long food history in China, Japan and Korea. Injected, the same compound is active enough on muscle to work as a vaccine adjuvant, producing transient cytotoxicity and a caspase-1-dependent pyroptotic inflammatory response at the injection site in mice.
Clinical note: Do not use this drug in any injectable or nebulised preparation. Oral decoction at conventional doses raises no haemolytic concern, and the frequently repeated warning about haemolysis should not be transferred to it.
Gan Cao (Glycyrrhiza uralensis)
Co-prescription with Glycyrrhiza uralensis raises the bioavailability of platycodin D, which is otherwise poorly absorbed. This is the pharmacological content of the classical two-herb pair Jie Geng Tang, in which the two are given together for throat complaints, and it means that the same weight of this root delivers more saponin when licorice is in the formula.
Clinical note: Expect a stronger effect from the pair than from the root alone. Remember that adding licorice brings its own mineralocorticoid risk in hypertension, oedema and hypokalaemia.
Orally administered drugs with poor solubility or low permeability
Platycodin D is under investigation as a pharmaceutical solubiliser, a use that depends on the same surfactant property that makes it haemolytic in contact with cell membranes. A saponin-rich decoction taken with a poorly soluble oral drug may therefore increase its dissolution and absorption. The evidence is formulation science rather than clinical pharmacokinetics.
Clinical note: Separate dosing where a narrow-therapeutic-index oral drug is involved, rather than assuming no effect.
Gastric irritants (NSAIDs, corticosteroids, alcohol) and use in peptic ulcer
The expectorant action of saponin drugs works partly through mild gastric mucosal irritation and a reflex increase in bronchial secretion. At higher doses the same mechanism produces nausea and vomiting, and it is additive with other agents that irritate the gastric mucosa.
Clinical note: Take after food, keep to conventional doses, and avoid in active peptic ulcer or on top of an NSAID.
Anticoagulant and antiplatelet drugs
Anticoagulant activity appears in the list of platycodin D's reported preclinical effects. No clinical report links this drug to bleeding, and no pharmacokinetic study has tested the combination, so the concern rests on a single line of preclinical pharmacology.
Clinical note: No action required beyond the usual monitoring; record the theoretical basis rather than presenting it as a documented interaction.
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】苦、辛，平。归肺经。 — Chinese Pharmacopoeia 2020, quoted verbatim; route and cautions preserved. Replaces a cleared category-filler value. |
Dui Yao — Herb Pairs
The classical two-herb combinations this herb appears in, each with an action neither herb has alone.
Heat toxin is resolved while lung qi is opened, relieving sore throat.
Core pair of a classical formula — Jie Geng Tang, Shang Han Lun (Zhang Zhongjing)
Astringing the Lung while opening Lung qi and benefiting the throat, the pair restores the voice in chronic cough with hoarseness or loss of voice.
Traditionally with Gan Cao.
Core pair of a classical formula — He Zi Tang, Huang Di Su Wen Xuan Ming Lun Fang (Liu Wansu)
One raises and diffuses lung qi, the other descends and moves qi; together they restore the ascent and descent of qi in the chest, relieving fullness and oppression.
Named pairing — Lü Jingshan, Shi Jinmo Dui Yao
Evidence Tier
Strong evidence · 6 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
0 verified · 1 unverified
Show the study
Randomized controlled trial
2
0 verified · 2 unverified
Show 2 studies
- Effectiveness of a Chinese herbal medicine preparation in the treatment of cough in uncomplicated upper respiratory tract infection: a randomised double-blinded placebo-control trial
- Cardioprotective effects of platycodon grandiflorum granules in HER2-positive early breast cancer patients receiving trastuzumab plus pertuzumab: study protocol for a double blind randomized controlled trial
Other clinical trial
0
Observational / case report
0
In vitro / animal
3
0 verified · 3 unverified
Show 3 studies
- Caspase-1-Dependent Pyroptosis Mediates Adjuvant Activity of Platycodin D as an Adjuvant for Intramuscular Vaccines
- Exploring anti-SARS-CoV-2 natural products: dual-viral target inhibition by delphinidin and the anti-coronaviral efficacy of deapio platycodin D
- Revealing Molecular Mechanisms of the Bioactive Saponins from Edible Root of Platycodon grandiflorum in Combating Obesity
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
Chinese medicinal herbs for sore throat
Twelve randomised trials in 1,954 participants of Chinese herbal formulations for sore throat, ten judged methodologically poor and two of medium quality, so no meta-analysis was possible. Six formulations beat their comparator on recovery and six were equivalent. The authors decline to recommend any formulation as an effective remedy. The review covers the indication for which this root is most used, and shows that the supporting clinical evidence at formula level is weak; it does not isolate the single herb.
Effectiveness of a Chinese herbal medicine preparation in the treatment of cough in uncomplicated upper respiratory tract infection: a randomised double-blinded placebo-control trial
Eighty-two adults in Hong Kong randomised to a nine-herb preparation containing this root, alongside Chuan Bei, Fang Feng, Gan Cao and Bai Bu, or to placebo for five days with six days of follow-up. Sixty-two completed. Both arms improved on cough score and the Leicester Cough Questionnaire with no significant overall difference between them; women reported less sputum and subjects over 35 less hoarseness on the active preparation. No adverse effects were reported. This is the closest thing to a controlled human trial touching this herb, and it is a multi-herb formula in a self-limiting illness with a null primary result.
Cardioprotective effects of platycodon grandiflorum granules in HER2-positive early breast cancer patients receiving trastuzumab plus pertuzumab: study protocol for a double blind randomized controlled trial
Protocol for a double-blind randomised controlled trial of granules of this root as cardioprotection in HER2-positive early breast cancer during trastuzumab and pertuzumab. It is a protocol: no results have been reported, and nothing about the drug's cardioprotective effect should be inferred from its existence. It is recorded here because it is the only registered controlled trial of the single herb that could be found.
Caspase-1-Dependent Pyroptosis Mediates Adjuvant Activity of Platycodin D as an Adjuvant for Intramuscular Vaccines
Platycodin D injected into mouse quadriceps and applied to C2C12 myoblasts caused transient cytotoxicity and an inflammatory response through calcium-dependent JNK and p38 MAPK signalling to the NLRP3 inflammasome and caspase-1-dependent pyroptosis. Blocking NLRP3 or caspase-1 at the injection site abolished both the local response and the adjuvant effect on antigen-specific immunity. Directly relevant to why this saponin must not be injected, and irrelevant to oral use.
Exploring anti-SARS-CoV-2 natural products: dual-viral target inhibition by delphinidin and the anti-coronaviral efficacy of deapio platycodin D
Screen of natural products against SARS-CoV-2 targets identifying deapioplatycodin D, a saponin of this root, as anti-coronaviral. Cell and target-level work with no animal or human data.
Revealing Molecular Mechanisms of the Bioactive Saponins from Edible Root of Platycodon grandiflorum in Combating Obesity
Mechanistic study of the root's saponins against obesity targets. It supports the anti-obesity signal reported for platycodin D in animals but does not bear on the drug's traditional respiratory use, and no human data follow from it.
Historical Texts
Shen Nong Ben Cao Jing
Han dynasty, compiled by c. 200 CEShang Han Lun
Eastern Han dynasty, c. 200-210 CEBen Cao Gang Mu
Ming dynasty, 1596References
- Zhang L, Wang X, Zhang J, Liu D, Bai G. Ethnopharmacology, phytochemistry, pharmacology and product application of Platycodon grandiflorum: A review . Chinese Herbal Medicines (2024) [DOI]
- Xie L, Zhao YX, Zheng Y, Li XF. The pharmacology and mechanisms of platycodin D, an active triterpenoid saponin from Platycodon grandiflorus . Frontiers in Pharmacology (2023) [DOI]
- Li Q, Yang T, Zhao S, Zheng Q, Li Y, Zhang Z, Sun X, Liu Y, Zhang Y, Xie J. Distribution, Biotransformation, Pharmacological Effects, Metabolic Mechanism and Safety Evaluation of Platycodin D: A Comprehensive Review . Current Drug Metabolism (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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