Long Dan Cao - Gentian root
Long Dan Cao - the root of the Chinese gentian (Gentiana scabra) - bears the impressive name „dragon's gall herb", which refers to its extremely bitter taste. It is the lead herb of the famous formula Lóng Dǎn Xiè Gān Tāng - the „Gentian Decoction for Draining the Liver" - and the most powerful TCM remedy for clearing Liver-Fire and Damp-Heat in the Lower Warmer. Its bitter, cold character lowers rising liver yang and extinguishes fire that flares up in headaches, red eyes, irritability and ringing in the ears. At the same time it dries damp-heat in the urogenital area.
Effect from a Western perspective
Gentiana scabra contains secoiridoid glycosides (gentiopicroside, swertiamarin), xanthones and amarogentin - one of the most bitter naturally occurring substances. Studies show hepatoprotective, cholagogic and anti-inflammatory effects. Gentiopicroside stimulates bile secretion and protects the liver from toxic damage. Antimicrobial activity against various bacteria and fungi has been demonstrated in vitro - supporting its use in moist-heat conditions in the urogenital tract.
Effect from a TCM perspective
Long Dan Cao clears damp-heat in the liver and gallbladder and extinguishes liver fire. It is the remedy of choice for ascending liver fire with headache, red and sore eyes, tinnitus, hearing loss, irritability and bitter taste in the mouth. For damp-heat in the lower warmer - leucorrhea, itching in the genital area, cloudy and painful urine, swollen and painful testicles - it penetrates the pathogenic factors and expels them. Long Dan Cao is also used for jaundice caused by damp-heat in the liver and gallbladder. Its strong, downward character - typical of bitter, cold herbs - makes it one of the most effective draining agents in the entire TCM materia medica.
Application & dosage
In decoction 3-6 g - small doses are sufficient due to the strong bitterness and cold. Overdosing leads to nausea, vomiting and loss of appetite. As a granular extract (5:1) typically 0.6-1.2 g. In pill form for long-term use in chronic damp-heat.
Dosage forms
Decoction, granules, tablets, pills
Dosage
3-6 g (decoction)
Frequent combination partners
Long Dan Cao often only develops its full effect in combination with other herbs
Combinations & formulas
With Huáng Qín, Zhī Zǐ and Chái Hú in Lóng Dǎn Xiè Gān Tāng for Liver-Fire and Damp-Heat. With Jú Huā and Xià Kū Cǎo for ascending liver yang with headaches. With Huáng Bǎi and Cāng Zhú for damp-heat in the lower warmer. With Chē Qián Zǐ and Zé Xiè to eliminate damp-heat via the urine.
History & Tradition
Long Dan Cao - the „dragon's bile herb" - has been an integral part of Chinese medicine for over 2000 years. As early as the „Shennong Ben Cao Jing" (Divine Countryman Herbal Classic), the oldest Chinese herbal book from the Han Dynasty (around 200 BC), it is listed as a middle-class remedy and praised for its ability to clear heat from the intestines and expel damp-heat. The name „long dan" - literally „dragon's gall" - refers to the root's extraordinarily bitter taste. In Chinese mythology, dragon's bile is considered the most bitter of all. Li Shizhen, the great encyclopaedist of the Ming dynasty (1518-1593), dedicated a detailed entry to Long Dan Cao in his main work „Ben Cao Gang Mu" and emphasized its effect on liver fire, cramps and feverish illnesses. He particularly emphasized the need to use the herb with caution and not for too long due to its extreme coldness. The classic formula Lóng Dǎn Xiè Gān Tāng - the „Gentian Decoction for Draining the Liver" - comes from the work „Yi Fang Ji Jie" (1682) by the Qing dynasty physician Wang Ang. This formula is still considered one of the most important compositions of TCM for Liver-Fire and Damp-Heat in the Lower Heater and is used in modern clinical practice worldwide. Long Dan Cao is the lead herb in it - its bitter, cold character drains fire downwards and expels damp-heat through the intestines and bladder. In Japan - where the plant is known as „Rindō" (竜胆) - it has been used medicinally since the Nara period (710-794) and still adorns family crests today. In Japanese culture, the flower of the gentian is a symbol of sincerity and inner strength - qualities that are also attributed to the herb therapeutically: the clear, uncompromising extinguishing of fire without detours.
Contraindications & caution
Strictly contraindicated for spleen and stomach cold, diarrhea caused by yang deficiency and loss of appetite without heat signs. The extreme bitterness and coldness can severely impair digestion. Do not use long-term in high doses - can permanently damage the spleen yang. Not for yin deficiency without damp-heat. Only use during pregnancy after careful consideration.
Botany
Gentiana scabra is a perennial herbaceous plant from the gentian family (Gentianaceae) and grows to a height of 30-60 cm. The upright stems bear opposite, lanceolate leaves with a rough surface - hence the species name „scabra" (Latin for rough). The funnel-shaped, intense blue-violet flowers appear in late summer and fall. The strong, yellowish-brown roots and rhizomes, which develop a characteristically intense bitter smell when dried, are used medicinally.
The genus Gentiana includes over 400 species worldwide; in addition to Gentiana scabra, the closely related species Gentiana triflora and Gentiana manshurica are also used in TCM and are recognized as equivalent in the Pharmacopoeia of the People's Republic of China. The active ingredient gentiopicroside - responsible for the extreme bitterness - is found in comparable concentrations in all three species. The roots are harvested in the fall, when the active ingredient content is at its highest, and then dried and cut or processed into granules.
Occurrence
Gentiana scabra is native to East Asia and grows wild in the mountainous regions of China (Manchuria, Sichuan, Yunnan), Japan and Korea. The plant prefers moist, semi-shady locations on acidic, well-drained soil at altitudes of 200-2000 meters. In China, a large part of the supply today comes from cultivated crops, especially in the provinces of Heilongjiang, Jilin and Liaoning. Wild collection has declined due to overexploitation, which is why commercial cultivation is becoming increasingly important.
Related herbs
Herbs with similar effects and related areas of application
Comparable western herbs
- **Gentian (Gentiana lutea):** The European relative shares the extremely bitter taste with gentiopicroside and is used in Western herbal medicine as a bitter tonic for indigestion and loss of appetite. Less cold in effect than Long Dan Cao, but botanically and phytochemically closely related.
- **Marian thistle (Silybum marianum):** Like Long Dan Cao, it has a hepatoprotective effect - silymarin protects liver cells from toxic damage and promotes their regeneration. In Western phytotherapy, it is the most important hepatoprotective agent, but without the pronounced heat-clearing and cholagogic active component of Chinese gentian.
- **Celandine (Chelidonium majus):** Cholagogue and bile flow-promoting like Long Dan Cao, with anti-inflammatory and antimicrobial effects. Used in the European tradition for gallbladder inflammation and jaundice - comparable to the use of Long Dan Cao for damp-heat in the liver and gallbladder.
- **Goldenrod (Solidago virgaurea):** Used for infections and inflammations in the urogenital tract - an area of application that corresponds to that of Long Dan Cao for damp-heat in the lower warmer. Has a diuretic, antimicrobial and anti-inflammatory effect, but without the strong bitterness and liver effect of gentian.