Qing Ye Dan

Qing Ye Dan is the dried whole herb of Swertia mileensis T.N.Ho & W.L.Shih, an annual or biennial herbaceous plant in the family Gentianaceae (gentian family). In the traditional TCM classification system, Qing Ye Dan is considered bitter in flavor with a very cold nature. It enters the Liver, Gallbladder, and Stomach meridians, giving it a central role in formulas that address damp-heat in the Liver and Gallbladder, jaundice, and gallbladder disorders.

Botanical description: Swertia mileensis is a small, erect annual or biennial herb growing 15–40 cm tall. The stems are slender, erect, sometimes branched, and four-angled. The leaves are opposite, simple, lanceolate to narrowly elliptic, 2–6 cm long and 0.5–1.5 cm wide, with a prominent midrib and three to five parallel veins. The leaf margins are entire and the surface is smooth and glabrous. The flowers are borne in terminal or axillary cymes and are characterized by their striking appearance — they have five petals that are yellow, star-shaped, with distinctive dark green or purplish nectaries at the base of each petal that look like two-lobed glands. This feature is characteristic of the genus Swertia. The corolla is 1–2 cm in diameter. The fruit is a small, elongated capsule containing numerous small seeds. The entire plant is intensely bitter to the taste. The herb is harvested during the flowering period in autumn and dried in the sun.

Habitat and distribution: S. mileensis is endemic to Yunnan Province in southwestern China, where it is found in the central and southern parts of the province, including areas around Kunming, Chuxiong, Yuxi, and Honghe. The plant grows in mountainous areas, open grasslands, forest margins, and along hillsides at elevations of 1,300–2,400 meters. It prefers well-drained, slightly acidic soils in sunny to partially shaded locations. The endemic distribution makes Qing Ye Dan a distinctive herb of the Yunnan regional materia medica, and it is one of the important medicinal plants in the traditional Yao and Yi ethnic medicine systems of Yunnan. Due to its limited distribution, conservation and sustainable harvesting practices are important considerations.

Quality markers: The Chinese Pharmacopoeia specifies that high-quality Qing Ye Dan should consist of whole plants with green leaves, yellow flowers, and a characteristic intensely bitter taste. The herb should have a high content of swertiamarin and gentiopicroside as determined by HPLC analysis. The leaves should be green, not yellowed or browned, and the flowers should retain their yellow coloration with visible nectary glands. Premium-grade material is characterized by its intact plant morphology, intense bitterness, absence of mold or excessive soil contamination, and high secoiridoid glycoside content.

In the traditional Chinese medicine theoretical framework, Qing Ye Dan is understood in terms of its effects on specific patterns of disharmony (zheng). Because it enters the Liver, Gallbladder, and Stomach meridians and has a bitter, very cold quality, it is traditionally indicated for patterns involving damp-heat in the Liver and Gallbladder, with particular emphasis on jaundice and gallbladder dysfunction.

Clearing damp-heat jaundice: The most important traditional use of Qing Ye Dan is the treatment of damp-heat jaundice (huang dan). In TCM theory, jaundice is caused by the accumulation of damp-heat in the Liver and Gallbladder, which obstructs the normal flow of bile and causes yellow discoloration of the skin, sclera, and urine. Damp-heat jaundice presents as bright yellow discoloration (yang jaundice), accompanied by fever, thirst, bitter taste in the mouth, nausea, right hypochondriac pain, abdominal distension, and a yellow, greasy tongue coating. Qing Ye Dan addresses this pattern through its bitter-cold properties that clear heat, drain dampness, and promote bile flow. It is sometimes compared in function to Yin Chen Hao (Artemisia capillaris) and may be used as a regional substitute in Yunnan. In the classic formula context, it may be combined with Yin Chen Hao and Zhi Zi (Gardenia) in the pattern of Yin Chen Hao Tang.

Benefiting the gallbladder and promoting bile flow: Qing Ye Dan has a specific affinity for the Gallbladder and is traditionally used to benefit gallbladder function and promote the flow of bile. In TCM theory, when damp-heat accumulates in the Liver and Gallbladder, it can cause gallbladder qi stagnation, leading to symptoms such as right hypochondriac pain, distension, nausea, and intolerance to fatty foods. These traditional indications overlap with what modern medicine describes as cholecystitis and cholelithiasis. Qing Ye Dan is used to clear the damp-heat, soothe the gallbladder, and restore normal bile flow. The very bitter nature of the herb is believed to be key to its gallbladder-stimulating properties, following the traditional principle that bitter flavors drain and dry.

Resolving damp-heat in the Stomach: Because Qing Ye Dan enters the Stomach meridian, it is also used for patterns of damp-heat in the Stomach. In TCM theory, damp-heat in the Stomach may present as nausea, vomiting, bitter taste, epigastric burning, and a thick, yellow-greasy tongue coating. The bitter-cold nature of Qing Ye Dan clears the heat, dries the dampness, and restores normal Stomach function. It may be combined with Huang Lian and Huang Qin for damp-heat affecting both the Stomach and the Liver-Gallbladder system.

Ethnomedical context in Yunnan: Qing Ye Dan holds particular significance in the traditional medicine of Yunnan Province, where it has been used for centuries by local ethnic communities, including the Yi and Yao peoples, as a remedy for jaundice and liver conditions. The herb is deeply embedded in the local medicinal tradition and is one of the characteristic herbs of the Yunnan materia medica. Its incorporation into the national Chinese Pharmacopoeia reflects the recognition of its traditional value and the scientific interest in its hepatoprotective properties. In Yunnan folk practice, Qing Ye Dan is sometimes used as a simple decoction or prepared as a medicinal wine for liver and gallbladder conditions.

Classical and modern literature references: Qing Ye Dan was first formally documented in the Yunnan Zhong Cao Yao(Yunnan Chinese Materia Medica) and later included in the Chinese Pharmacopoeiaas an official monograph. The Zhong Hua Ben Cao (Chinese Materia Medica) provides a comprehensive monograph summarizing its botanical identity, traditional uses, chemical constituents, and pharmacological research. The herb's reputation as an effective treatment for damp-heat jaundice has been recognized in both regional and national TCM literature.

Qing Ye Dan contains a rich array of bioactive compounds characteristic of the Gentianaceae family. The following overview summarizes the major chemical constituents identified in the whole herb of Swertia mileensis and what is currently known about them from published research.

Swertiamarin: Swertiamarin is a secoiridoid glycoside and one of the major bitter principles in Qing Ye Dan. It is characteristic of the Gentianaceae family and has been extensively studied for its hepatoprotective, choleretic, and anti-inflammatory properties. Swertiamarin has been shown in pre-clinical models to protect hepatocytes from toxin-induced damage by modulating antioxidant defense systems and reducing lipid peroxidation. Its choleretic effect — the stimulation of bile production and flow — has been demonstrated in animal models and is consistent with the traditional use of Qing Ye Dan for promoting bile flow. Swertiamarin also exhibits anti-inflammatory activity through inhibition of NF-kappaB signaling and reduction of pro-inflammatory cytokine production. These pre-clinical findings are mechanistically consistent with the herb's traditional hepatobiliary indications but do not constitute clinical evidence.

Gentiopicroside: Gentiopicroside is another secoiridoid glycoside found in Qing Ye Dan and is one of the most characteristic bitter compounds of the Gentianaceae family. It has been studied for its hepatoprotective, choleretic, and anti-inflammatory activities in pre-clinical research. Gentiopicroside has demonstrated the ability to protect liver cells from carbon tetrachloride- and acetaminophen-induced injury in animal models. The compound also exhibits analgesic and spasmolytic effects, which may contribute to the traditional use of Qing Ye Dan for right hypochondriac pain and gallbladder discomfort. As with swertiamarin, most evidence is from pre-clinical studies and clinical relevance for human gallbladder conditions has not been established.

Oleanolic acid: Oleanolic acid is a pentacyclic triterpenoid found in Qing Ye Dan and many other medicinal plants. It is one of the most extensively studied hepatoprotective compounds from natural sources. Oleanolic acid has demonstrated significant hepatoprotective effects in pre-clinical models by reducing liver enzyme elevation, inhibiting lipid peroxidation, enhancing antioxidant enzyme activities, and modulating inflammatory pathways. It is widely used in China as a hepatoprotective drug in its purified form. Oleanolic acid also has anti-inflammatory, antioxidant, and potential antitumor activities. Its presence in Qing Ye Dan contributes to the herb's overall hepatoprotective profile.

Mangiferin: Mangiferin is a xanthonoid C-glucoside found in Qing Ye Dan and widely distributed in the plant kingdom. It has been studied for its antioxidant, anti-inflammatory, antidiabetic, and immunomodulatory properties. Mangiferin scavenges free radicals, inhibits advanced glycation end-product formation, and modulates multiple signaling pathways including NF-kappaB, AMPK, and Nrf2. Pre-clinical studies have demonstrated hepatoprotective, cardioprotective, and neuroprotective activities. The mangiferin content of Qing Ye Dan adds to its overall antioxidant and hepatoprotective properties.

Xanthones: Various xanthone compounds have been isolated from Swertia mileensis, including swertianin, swertianol, bellidifolin, and other derivatives. Xanthones are a class of compounds with diverse biological activities. Those found in Qing Ye Dan have been studied for their antimicrobial, anti-inflammatory, hepatoprotective, and potential antitumor properties in pre-clinical models. The xanthone content is considered one of the distinctive chemical features of the Swertia genus and contributes to the overall pharmacological profile of Qing Ye Dan.

The compounds listed above are chemical constituents identified through phytochemical analysis. Their pharmacological activities described are based on pre-clinical studies (animal models, in-vitro experiments) and do not represent confirmed clinical effects in humans.

Qing Ye Dan is used in several formula contexts in the TCM tradition, particularly those addressing damp-heat jaundice and gallbladder disorders. Below are three representative formula contexts that feature this herb, along with their traditional indications and the role it plays in each composition.

The following section summarizes published pharmacological and pre-clinical research. Unless explicitly stated otherwise, the studies cited are animal models, in-vitro experiments, or mechanistic research — not human clinical trials. These findings should not be interpreted as evidence for clinical efficacy or as a basis for self-treatment.

Hepatoprotective effects: The hepatoprotective properties of Qing Ye Dan have been the primary focus of modern research on this herb. Pre-clinical studies have demonstrated that extracts of Swertia mileensis can protect liver cells from various types of toxin-induced injury, including carbon tetrachloride, acetaminophen, and thioacetamide. The hepatoprotective mechanism is attributed to the combined effects of swertiamarin, gentiopicroside, oleanolic acid, and mangiferin, which work synergistically to reduce lipid peroxidation, enhance antioxidant enzyme activities, suppress inflammatory cytokine production, and inhibit hepatocyte apoptosis. Research by Jiang et al. (2018) demonstrated that swertiamarin from Swertia species protected rat hepatocytes from CCl4-induced injury through Nrf2 pathway activation (PMID: 29565382). These pre-clinical findings are consistent with the traditional use of Qing Ye Dan for liver and gallbladder conditions, but clinical trials in humans are limited.

Choleretic and bile-promoting effects: The ability of Qing Ye Dan to promote bile flow has been investigated in pre-clinical models. Studies have shown that secoiridoid glycosides from Swertia species increase bile secretion and modify bile composition in animal models. The choleretic effect is mediated through multiple mechanisms, including stimulation of hepatocyte bile acid synthesis, enhancement of bile acid-independent bile flow, and relaxation of the sphincter of Oddi. These findings are mechanistically consistent with the traditional use of Qing Ye Dan for benefiting the gallbladder and promoting bile flow in patterns of Liver-Gallbladder damp-heat.

Anti-inflammatory and antioxidant effects: The flavonoid, xanthone, and secoiridoid constituents of Qing Ye Dan have been studied for their anti-inflammatory and antioxidant activities. Extracts of S. mileensis have demonstrated significant free radical scavenging activity in DPPH and ABTS assays, as well as inhibition of lipid peroxidation in pre-clinical models. The anti-inflammatory effects involve suppression of NF-kappaB activation, reduction of TNF-alpha and IL-6 production, and inhibition of COX-2 expression. These mechanisms may contribute to the herb's traditional use in resolving damp-heat inflammation, but their clinical relevance for human inflammatory conditions has not been established through controlled trials.

Antimicrobial and antiviral potential: Some studies have investigated the antimicrobial properties of Swertia extracts. Xanthone compounds isolated from S. mileensis have demonstrated inhibitory activity against various bacterial and fungal pathogens in vitro. Additionally, some research has explored the potential anti-hepatitis B virus activity of Swertia extracts, with preliminary in-vitro studies showing inhibition of HBV surface antigen production. These findings are preliminary and should not be interpreted as evidence for clinical efficacy against infectious diseases.

What the research does NOT show: Despite promising pre-clinical signals, the research on Qing Ye Dan does NOT demonstrate conclusive clinical efficacy for any specific disease in humans. There are no large-scale, randomized, placebo-controlled clinical trials that establish Qing Ye Dan as an effective treatment for jaundice, hepatitis, cholecystitis, gallstones, or any other medical condition. The translation from animal models and in-vitro experiments to human clinical relevance is uncertain. This page does not endorse Qing Ye Dan as a treatment for any condition.

Important: All pharmacological effects described above are based on pre-clinical studies (animal models, in-vitro experiments, or mechanistic research). They do not constitute evidence of clinical efficacy in humans. This section is provided for educational context and should not be used as a basis for treatment decisions.

General safety profile: Qing Ye Dan is generally considered to have a moderate safety profile when used appropriately at standard doses. However, its very cold and intensely bitter nature requires careful attention to dosing, duration of use, and pattern differentiation. The information below reflects what is currently known from published literature, pharmacopoeial standards, and traditional clinical experience.

Spleen-Stomach deficiency-cold: In traditional TCM theory, the very cold and bitter nature of Qing Ye Dan may severely damage the Spleen and Stomach in individuals with pre-existing deficiency-cold patterns. Symptoms such as poor appetite, loose stools, abdominal coldness, and a pale tongue with white coating may be worsened by its bitter-cold properties. This is one of the most important cautions for Qing Ye Dan, as its primary therapeutic action (clearing damp-heat) is directly opposed to the pattern it may worsen (Spleen-Stomach deficiency-cold). Careful pattern differentiation is essential before prescribing this herb.

Yin deficiency with virtual heat: Individuals with Yin deficiency — characterized by dry mouth, night sweats, a red tongue with little coating, and a thin, rapid pulse — should use Qing Ye Dan with caution. Its bitter-cold nature may further deplete Yin fluids and worsen the deficiency. In traditional TCM practice, this caution applies to all very cold herbs used in the context of Yin deficiency patterns.

Pregnancy and lactation: Qing Ye Dan should be used with caution during pregnancy. While there is no specific classical contraindication, the general TCM principle advises caution with very cold herbs during pregnancy. Self-administration during pregnancy is not recommended. During lactation, the very bitter compounds may be excreted in breast milk and could affect the infant's digestion. Qing Ye Dan should only be used during pregnancy or lactation under the direct supervision of a qualified healthcare professional.

Hypotensive effects: Some secoiridoid glycosides found in Gentianaceae plants have demonstrated hypotensive effects in pre-clinical models. Individuals with abnormally low blood pressure or those taking antihypertensive medications should use Qing Ye Dan with caution. Clinical data on this potential effect are very limited.

Drug interactions: The secoiridoid glycosides and xanthone constituents may affect hepatic cytochrome P450 enzyme activity, potentially altering the metabolism of drugs processed through these pathways. The choleretic properties may theoretically interact with medications that affect bile flow, such as ursodeoxycholic acid. Clinical interaction data for whole-herb Qing Ye Dan are very limited. Consult a qualified healthcare professional before combining this herb with any prescription medications.

This platform provides educational information about traditional Chinese medicine herbs. It does not recommend, endorse, or prescribe the use of Qing Ye Dan or any other herbal product for the treatment of any medical condition. All decisions regarding herbal use should be made in consultation with a qualified healthcare provider.