Herb

Zhu Ye

Lophatherum Herb | 竹叶

Also known as:

Dan Zhu Ye , Bamboo leaf

Zhu Ye

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Properties

Herbs that clear Heat and drain Fire (清热泻火药) · Cold

Traditionally supports*

Urinary Health Oral and Dental Health Summer Heat Relief Stress and Anxiety

Parts Used

Whole plant / Aerial parts (全草 quán cǎo)

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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About This Herb

Traditional Chinese Medicine background and properties

Herb Description

Dan Zhu Ye is a gentle, cooling herb commonly used to relieve irritability, mouth sores, and painful urination caused by internal Heat. It works by clearing Heat from the Heart and Stomach and promoting urination to flush Heat out of the body. It is mild enough to be brewed as a daily summer tea for preventing heat-related discomfort.

Herb Category

Herbs that clear Heat and drain Fire (清热泻火药)

Main Actions

  • Clears Heat and Drains Fire
  • Eliminates Irritability and Relieves Thirst
  • Promotes Urination and Relieves Stranguria

How These Actions Work

'Clears Heat and purges Fire' means Dan Zhu Ye cools down excessive internal Heat, particularly in the Heart and Stomach. Its cold nature and sweet, bland taste make it well suited for febrile illnesses where the person feels hot, feverish, and thirsty. It is especially known for clearing Heart Fire, which in TCM is associated with mouth and tongue sores, a flushed face, and mental restlessness.

'Eliminates irritability and relieves thirst' refers to its calming effect on the agitation and restlessness that accompany Heat conditions. When internal Heat disturbs the Heart (which in TCM houses the mind), a person may feel anxious, unable to sleep, and irritable. Dan Zhu Ye gently clears this Heat while also generating fluids to relieve thirst caused by Heat consuming the body's moisture.

'Promotes urination and treats painful urinary dysfunction' describes its bland, percolating nature, which helps guide Heat downward and out through the urine. This is why it is used for dark, scanty, or painful urination. In TCM theory, the Heart and Small Intestine are internally connected, so when Heart Fire transfers to the Small Intestine, it can cause urinary symptoms. Dan Zhu Ye addresses this by clearing the Heat from above while simultaneously draining it downward through urination.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Dan Zhu Ye is traditionally associated with these specific patterns.

The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.

Why Dan Zhu Ye addresses this pattern

Dan Zhu Ye is sweet, bland, and cold, and it enters the Heart channel directly. When Heart Fire blazes upward, it produces mouth and tongue sores, mental restlessness, and a red-tipped tongue. Dan Zhu Ye clears this Heart Fire through two routes: upward, it cools the Heart and calms the mind; downward, its bland nature promotes urination, drawing the Heat out via the Small Intestine (the Heart's paired organ). This dual action makes it particularly effective for Heart Fire that manifests both as upper-body symptoms (mouth sores, irritability) and lower-body symptoms (dark, painful urination).

A practitioner would look for one or more of these signs

Mouth Ulcers

Mouth and tongue sores from Heart Fire flaring upward

Irritability

Mental restlessness and agitation

Dysuria

Dark, scanty, painful urination

Insomnia

Difficulty sleeping due to Heat disturbing the mind

TCM Properties

Temperature

Cold

Taste

Sweet (甘 gān), Bland (淡 dàn)

Channels Entered
Heart Stomach Small Intestine
Parts Used

Whole plant / Aerial parts (全草 quán cǎo)

This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page

Product Details

Manufacturing, supplier, and product specifications

Product Type

Granules

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Botanical & Sourcing

Quality Indicators

Good quality Dan Zhu Ye consists primarily of leaves with minimal stems, no roots, and no flower spikes. The leaves should be large, intact, and a clear green to bluish-green color (色青绿). The stems should be pale yellow-green. The herb is light in weight and flexible (not brittle). On close inspection, the distinctive rectangular lattice pattern formed by small transverse veinlets should be visible on the lower leaf surface. The taste should be bland (淡) and the smell faint. Avoid material that is heavily yellowed, contains many roots or stem fragments, is mixed with flower heads, or appears damp or moldy. Fresh material (for food use) should have tender, bright green leaves.

Primary Growing Regions

Dan Zhu Ye is distributed widely across southern China, primarily south of the Yangtze River. The main producing regions include Zhejiang, Jiangsu, Hunan, Hubei, Guangdong, Anhui, Jiangxi, Sichuan, and Fujian provinces. Zhejiang province is considered the premier source for both quantity and quality, and the herb from this region is sometimes called 'Hang Zhu Ye' (杭竹叶). Under current conditions, the plant is predominantly found in Hunan, Guangxi, and Fujian. Most commercial Dan Zhu Ye is wild-harvested rather than cultivated.

Harvesting Season

Summer (typically May to July), before the flower spikes emerge. The aerial parts (stems and leaves) are cut, dried in the sun, and bundled.

Supplier Information

Treasure of the East

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Miscellaneous Info

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Usage & Safety

How to use this herb and important safety information

Important Medical Disclaimer

The information provided here is for educational purposes only and is not intended as medical advice or to replace consultation with a qualified healthcare professional. This herb is a dietary supplement and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease.

Always consult with a qualified healthcare provider, particularly if you are pregnant, nursing, have a medical condition, or are taking other medications. Discontinue use and consult your healthcare provider if you experience any adverse reactions.

Recommended Dosage

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Instructions for safe storage and consumption

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Traditional Dosage Reference

Standard

6-10g

Maximum

Up to 15g in decoction for acute Heat conditions, under practitioner guidance. Dan Zhu Ye is mild in action, so exceeding the standard range carries relatively low risk, but prolonged high doses may damage Spleen Yang or deplete fluids.

Notes

Use the lower end of the range (6g) for mild Heart Heat with irritability or as a supporting herb in a formula. Use the higher end (9-10g) when the primary goal is to promote urination for Heat-related painful urination (re lin) or for more pronounced mouth and tongue sores. When combined with Shi Gao (Gypsum) to clear residual Heat after a febrile illness (as in Zhu Ye Shi Gao Tang), standard doses of 6-9g are sufficient. This herb is mild in potency compared to stronger Heat-clearing herbs, so it is often used as a supporting ingredient rather than the main therapeutic agent.

Toxicity Classification

Non-toxic

Dan Zhu Ye is classified as non-toxic in the Chinese Pharmacopoeia and the Ben Cao Gang Mu. It has been used clinically for many years with virtually no reported toxic side effects. A small number of people may experience mild gastrointestinal reactions such as nausea when taking it. Its root, however, has a separate traditional caution: classical literature records that the root can 'break Blood and cause miscarriage' (破血堕胎), which is why the root is not used as part of the standard medicinal preparation and should be removed during processing.

Contraindications

Avoid

Pregnancy. Classical texts (《品汇精要》) explicitly state that pregnant women should not take Dan Zhu Ye. The root of the plant has been traditionally recorded as having the ability to 'break Blood and cause miscarriage' (破血堕胎), and the whole herb is classified as cold in nature, which may be harmful during pregnancy.

Caution

Spleen and Stomach deficiency-cold (脾胃虚寒). Dan Zhu Ye is cold in nature and bland in flavor. In people with cold constitutions or weak digestion marked by loose stools, poor appetite, or abdominal cold pain, this herb can further damage the Spleen Yang and worsen symptoms.

Caution

Absence of true Heat or Fire. Dan Zhu Ye is specifically indicated for patterns of excess Heat. Using it when there is no genuine Heat condition present may unnecessarily drain the body's warmth and fluids.

Caution

Frequent or copious clear urination. Because Dan Zhu Ye promotes urination, it should be used cautiously in people who already urinate excessively or have clear, dilute urine, as this may indicate cold rather than Heat and the diuretic effect could lead to further fluid loss.

Special Populations

Pregnancy

Contraindicated during pregnancy. The classical text Pin Hui Jing Yao (《品汇精要》) explicitly states 'pregnant women should not take this' (孕妇勿服). Additionally, classical literature records that the root of the Dan Zhu Ye plant has the ability to 'break Blood and induce miscarriage' (破血堕胎). Although the standard medicinal preparation uses only the stems and leaves (not the root), the cold nature of the herb and its downward-draining diuretic action are considered potentially harmful to the stability of pregnancy. It should be avoided throughout all trimesters.

Breastfeeding

No specific classical or modern prohibitions for breastfeeding have been established. However, Dan Zhu Ye is cold in nature and promotes fluid loss through urination. It should be used with caution in breastfeeding women, as excessively cold herbs may theoretically affect digestion and milk production, particularly in mothers with underlying Spleen deficiency. Short-term use at standard doses for a specific Heat condition is generally considered acceptable under practitioner guidance.

Pediatric Use

Dan Zhu Ye has been traditionally used for pediatric conditions including childhood Heat-related irritability, mouth sores, and restlessness. In the classical text Ben Cao Zai Xin, it is noted for treating 'childhood pox toxin.' Pediatric dosages should be reduced proportionally based on age and body weight, typically to one-third to one-half the adult dose. Because the herb is cold and promotes urination, it should be used for limited courses in children and not given long-term, as children's Spleen and Stomach functions are inherently delicate.

Drug Interactions

No well-documented pharmacological drug interactions have been established for Dan Zhu Ye in peer-reviewed literature. However, based on its known properties, the following theoretical considerations apply:

  • Diuretic medications: Dan Zhu Ye has mild diuretic activity and may have an additive effect when combined with pharmaceutical diuretics (e.g. furosemide, hydrochlorothiazide), potentially increasing fluid and electrolyte loss.
  • Hypoglycemic agents: Pharmacological studies have noted that Lophatherum gracile extracts may raise blood sugar levels. Patients taking insulin or oral hypoglycemic agents should be aware of this potential interaction, although the clinical significance at standard decoction doses is uncertain.
  • Antipyretic medications: Dan Zhu Ye has mild antipyretic properties and could theoretically enhance the fever-reducing effects of drugs like acetaminophen or NSAIDs.

Dietary Advice

While taking Dan Zhu Ye, avoid excessive consumption of cold, raw, or icy foods and drinks if there is any underlying Spleen weakness, as the herb's cold nature combined with cold food may further impair digestion. Greasy, heavy, or strongly spicy foods should also be moderated, as these can generate internal Heat or Dampness that works against the herb's gentle clearing action. Light, easily digestible foods are preferred. Dan Zhu Ye is itself classified as a 'medicine-food homologous' substance (药食同源) in China and is commonly consumed as a cooling summer tea, sometimes brewed with Lu Gen (reed rhizome) or combined with mung beans.

Cautions & Warnings

Although this formula is typically safe for most individuals, it may cause side effects in some people. Pregnant women, nursing mothers, postpartum women, and those with liver disease should use the formula with caution.

As with any Chinese herbal remedy, it is advisable to seek guidance from a qualified TCM practitioner before beginning treatment.