Mai Dong â Snake's Beard Root
Mai Dongâthe root tuber of the snakeâs beard plantâis one of the most important yin-nourishing herbs in TCM. For over 2,000 years, it has been listed as a first-class remedy in the *ShĂ©n NĂłng BÄn CÇo JÄ«ng*. Mai Dong moistens the lungs, nourishes stomach yin, and calms the mindâespecially in cases of dry cough, thirst, and inner restlessness caused by yin deficiency.
Effect from a Western perspective
Studies have shown that steroidal saponinsâparticularly ophiopogonin Dâhave anti-inflammatory and cardioprotective effects. Polysaccharides from Mai Dong have immunomodulatory effects and have been shown to lower blood sugar levels in animal models.
- Ophiopogonin D inhibits proinflammatory cytokines and protects heart tissue
- Polysaccharides activate macrophages and modulate the immune response
- Blood-glucose-lowering effect due to improved insulin sensitivity in animal models
- Antioxidant Effects Due to the Radical-Scavenging Activity of Homoisoflavonoids
- Gastroprotective effect by strengthening the gastric mucosal barrier
- Antiviral activity against influenza A demonstrated in vitro
Effect from a TCM perspective
Mai Dong nourishes the Yin of the lungs, stomach, and heart. It moistens the lungs and relieves dry coughsâespecially in cases of Yin deficiency with thick, scanty phlegm. In the stomach, it generates body fluids and alleviates thirst and dry mouth. Through its connection to the heart, it calms the Shenâwhich is why it is used for irritability, sleep disturbances, and palpitations caused by Yin-deficiency heat.
- Nourishes lung yin and moistens the lungs in cases of dry cough with thick phlegm
- Generates body fluids and quenches thirst in cases of stomach yin deficiency
- Calms the Shen in cases of insomnia and palpitations caused by deficiency-heat
- Clears heart fire and relieves inner restlessness and irritability
- Moistens the intestines in cases of constipation caused by dryness and yin deficiency
Application & dosage
- 6â12 g in a decoction (standard dose)
- Up to 15 g in cases of severe yin deficiency
- In Sheng Mai San: 9 g as the standard dose
- Granules: 2â4 g daily, dissolved in warm water
- Tablets/capsules: 1â2 g of extract daily
- Powder: 3â6 g daily, stirred into warm water or congee
- Tincture: 2â4 ml (1:5 extract), 2â3 times daily
Dosage forms
- Decoction (20â30 min.)
- Granules
- Tablets/Capsules
- Powder
- Congee (rice porridge)
- Tincture (1:5 extract)
Dosage
6â12 g (decoction)
Frequent combination partners
Mai Dong often does not reach its full potential until it is combined with other herbs
Combinations & formulas
- With Sha Shen forms Mai Dong A classic combination for moistening the lungs in cases of dry cough and hoarsenessâas in Sha Shen Mai Dong Tang.
- With Sheng Di Huang It is combined to clear Yin-deficiency heat and replenish body fluids.
- When combined with Tian Men Dong, it enhances the lung-yin-nourishing effect in cases of severe yin deficiency.
- With Wu Wei Zi and Ren Shen It forms Sheng Mai Sanâthe pulse-generating formula for heart qi and yin deficiency.
History & Tradition
Mai Dong is first described in the *ShĂ©n NĂłng BÄn CÇo JÄ«ng* as a first-class medicinal herbâa remedy that can be taken long-term without causing harm.
During the Han Dynasty, Zhang Zhongjing recognized the special importance of Mai Dong for the lungs and made it the primary herb in Mai Men Dong Tangâa formula used to treat lung yin deficiency characterized by a dry cough and shortness of breath.
During the Tang and Song dynasties, Mai Dong came to be increasingly valued as a heart herb. In *BÄn CÇo GÄng MĂč*, Li Shizhen describes its ability to nourish heart yin and calm the mind.
In Japan, it is known as BakumondĆ and is an integral part of Kampo medicine.
Contraindications & caution
Do not use in cases of spleen-yang deficiency with watery diarrheaâMai Dongâs moisturizing nature may exacerbate the dampness. Use with caution in cases of cold-phlegm in the lungs with copious white, watery sputum. Mai Dong is not suitable for wind-cold colds in the early stages.
Botany
Ophiopogon japonicus is an evergreen, grass-like perennial in the asparagus family (Asparagaceae). The plant forms dense clumps of narrow, dark green leaves that grow to 20â40 cm in length. The root tubers used for medicinal purposes are spindle-shaped, 1â3 cm long, and pale yellow in color.
- Southeast China (Zhejiang, Sichuan, Hubei)
- Japan and Korea
- Shady forests at elevations of 200â1,800 m
- Cultivated throughout East Asia
Occurrence
Main growing regions are in Zhejiang, Sichuan, and Hubei (China). It grows in shady forests and on moist slopes at elevations of 200â1,800 m. It is cultivated throughout East Asia and is also widespread in Japan and Korea. Harvesting takes place after 2â3 years of cultivation.
Harvest time
Harvest in the summer after 2â3 years of cultivation. Dig up the root tubers, wash them, and sun-dry them.
Processing
Fresh root tubers are dug up, washed, and dried in the sun. The central fibers (wooden core) are then removedâan important step, as the core is considered less effective and can cause stomach upset. The dried tubers are used as a crude drug (MĂ i DĆng) or, less commonly, moistened with wine and dried again (JiÇ MĂ i DĆng).
Related herbs
Herbs with similar effects and related areas of application
Comparable western herbs
- Marshmallow root (Althaea officinalis) â has a similar moisturizing effect on the mucous membranes of the lungs and digestive tract. The mucilage in marshmallow root forms a protective layer over irritated mucous membranes â similar to the moisturizing effect of Mai Dong on dry coughs and dryness of the stomach.
- Licorice root (Glycyrrhiza glabra) â shares mucosal-protective and anti-inflammatory properties. Both herbs are used to treat dry, irritating coughs and stomach irritation; licorice also has adaptogenic effects and strengthens the Qi â similar to Mai Dong when combined with Ren Shen.
- Icelandic moss (Cetraria islandica) â moistens the respiratory tract and relieves dry, irritating coughs due to its high content of mucilage (lichenin). Its mechanism of action corresponds to the lung-yin-nourishing properties of Mai Dong in cases of dryness in the upper respiratory tract.
- Lemon balm (Melissa officinalis) â shows functional parallels to the effects of Mai Dong on the heart: Both calm the nervous system, relieve palpitations, and promote sleep in cases of inner restlessness â albeit through different mechanisms of action (neurotrophic vs. yin nourishment).