What patterns does Bu Zha Ye address?

Bu Zha Ye addresses these TCM patterns of disharmony: Blood Stagnation, Damp-Heat, Summer-Heat.

What conditions is Bu Zha Ye used for?

Bu Zha Ye is commonly used for: Indigestion, Diarrhea, Jaundice, Post-Surgical Constipation And Bloating, Loss Of Appetite, Gastroenteritis, Common Cold, Nausea. A TCM practitioner would consider this herb when these conditions arise from the specific patterns it addresses.

Herb Leaf (叶 yè)

Bu Zha Ye

Q: What are the TCM actions of Bu Zha Ye?

The TCM actions of Bu Zha Ye include: Promotes Digestion and Resolves Food Stagnation, Clears Heat and Drains Dampness, Clears Summer-Heat, Resolves Phlegm, Promotes urination and relieves jaundice.

Microcos Leaf · 布渣叶

Microcos paniculata L. · Folium Microctis

Also known as: Po Bu Ye (破布叶)

Images shown are for educational purposes only

Bu Zha Ye is a traditional Lingnan (southern Chinese) herb best known as a key ingredient in cooling herbal teas like Wanglaoji. It helps relieve indigestion, bloating, and food stagnation, while also clearing internal heat and dampness. It is especially popular in Guangdong province as a summer beverage to ease digestive discomfort and heat-related symptoms.

Category Food stagnation-relieving herbs (消食药)

Therapeutic focus Digestive Health Summer Heat Relief Liver and Gallbladder Health Appetite Support

TCM Properties

Temperature

Cool

Taste

Sour (酸 suān), Bland (淡 dàn)

Channels entered

Spleen, Stomach

Parts used

Leaf (叶 yè)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

Every herb has a specific set of actions — here's what Bu Zha Ye does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Bu Zha Ye is primarily used to support these areas of health:

Digestive Health Summer Heat Relief Liver and Gallbladder Health Appetite Support

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Bu Zha Ye performs to restore balance in the body:

Promotes Digestion and Resolves Food Stagnation Clears Heat and Drains Dampness Clears Summer-Heat Resolves Phlegm Promotes urination and relieves jaundice

How these actions work

'Promotes digestion and resolves food stagnation' means Bu Zha Ye helps the Stomach and Spleen break down and move food that has accumulated and is sitting undigested in the gut. This is its primary action and the reason it is so widely used in folk medicine. It is applied when someone feels bloated, has a poor appetite, or experiences abdominal discomfort after eating, especially in children with indigestion.

'Clears Heat and drains Dampness' refers to the herb's ability to cool down excess warmth in the digestive tract while also helping the body eliminate excess fluid accumulation. Because it enters the Spleen and Stomach channels and has a cool nature, it is well suited for conditions where Dampness and Heat combine in the middle burner, such as damp-heat diarrhea and jaundice (yellowing of the skin and eyes caused by Dampness and Heat obstructing the Liver and Gallbladder).

'Clears Summerheat' means it helps the body cope with the oppressive heat and humidity of tropical summers. In southern China's hot, humid climate, people are prone to symptoms like fever, thirst, nausea, and fatigue from Summerheat exposure. Bu Zha Ye's cool nature and its affinity for the Stomach make it ideal as a cooling tea during hot months.

'Resolves phlegm' indicates a mild ability to help the body process and expel phlegm, particularly when it arises from Dampness and food stagnation obstructing the middle burner.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Bu Zha Ye is used to help correct these specific patterns.

Why Bu Zha Ye addresses this pattern

Bu Zha Ye directly addresses food stagnation through its digestive-promoting action. Its slightly sour taste helps stimulate the Stomach's digestive function, while its cool nature prevents the heat that commonly arises when food sits and ferments in the gut. By entering the Spleen and Stomach channels, it works precisely where food stagnation occurs, helping to break down accumulated food and restore the Stomach's descending function. This makes it especially useful for overeating, greasy food accumulation, and childhood indigestion.

A practitioner would look for one or more of these signs

Post-Surgical Constipation And Bloating

Abdominal bloating and distension after meals

Loss Of Appetite

Poor appetite or aversion to food

Indigestion

Indigestion with belching and sour regurgitation

Abdominal Pain

Epigastric or abdominal discomfort

Why Bu Zha Ye addresses this pattern

When Dampness and Heat accumulate together in the Spleen and Stomach, the digestive system becomes sluggish and inflamed. Bu Zha Ye's cool nature clears the Heat component, while its bland taste and dampness-draining action help resolve the Dampness. Its channel affinity for the Spleen and Stomach means it targets exactly where this pathological combination lodges. This pattern commonly manifests in the hot, humid climates of southern China, which is precisely where this herb has its deepest traditional roots.

A practitioner would look for one or more of these signs

Diarrhea

Loose, foul-smelling stools or diarrhea

Jaundice

Yellow discoloration of skin and eyes

Abdominal Pain

Abdominal pain with a burning or heavy quality

Nausea

Nausea or poor appetite with a greasy tongue coating

Why Bu Zha Ye addresses this pattern

Summerheat is an external pathogenic factor unique to the hot summer months that readily invades the body and disrupts the Stomach and Spleen. Bu Zha Ye's cool nature directly counteracts the warmth of Summerheat, while its digestive action addresses the nausea and appetite loss that often accompany it. This is the primary reason it has been used for centuries as a summer cooling tea in Guangdong and other tropical regions of China.

A practitioner would look for one or more of these signs

Fever

Low-grade fever in summer with sweating

Thirst

Thirst and irritability from heat exposure

Nausea

Nausea, vomiting, or loss of appetite in hot weather

Eye Fatigue

Fatigue and heaviness from summer humidity

Commonly Used For

These are conditions where Bu Zha Ye is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Blood Stagnation

TCM Interpretation

TCM understands indigestion as a failure of the Stomach to 'ripen and rot' food and the Spleen to 'transform and transport' nutrients. When food accumulates instead of moving through, it creates stagnation in the middle burner. Over time, stagnant food can generate Heat (like food fermenting), producing symptoms such as foul-smelling belching, sour regurgitation, and abdominal distension. The Stomach's normal downward movement becomes impaired, and Qi stagnates, causing pain and bloating.

Why Bu Zha Ye Helps

Bu Zha Ye enters the Spleen and Stomach channels and has a specific action of promoting digestion and resolving food stagnation. Its slightly sour taste stimulates digestive secretions and helps break down accumulated food, while its cool nature prevents or clears the Heat that commonly develops from prolonged food stagnation. Unlike strongly bitter digestive herbs, Bu Zha Ye is mild enough for regular use as a tea, making it suitable for chronic mild indigestion and for children's digestive problems.

Also commonly used for

Post-Surgical Constipation And Bloating

Abdominal distension from overeating or greasy food

Loss Of Appetite

Poor appetite, especially in children

Gastroenteritis

Acute gastroenteritis with damp-heat symptoms

Common Cold

Common cold with fever and digestive symptoms

Nausea

Nausea and hiccup in children

Herb Properties

Every herb has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Cool

Taste

Sour (酸 suān), Bland (淡 dàn)

Channels Entered

Spleen Stomach

Parts Used

Leaf (叶 yè)

Dosage & Preparation

These are general dosage guidelines for Bu Zha Ye — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

15-30g

Maximum dosage

Up to 60g has been used in specific clinical situations such as treating jaundice (combined with other herbs), but standard practice should remain within 15-30g for routine use.

Dosage notes

Use 15-30g for standard decoction to address food stagnation, indigestion, or damp-heat conditions. For mild daily use as a cooling herbal tea, 10-15g is common. For treating jaundice, traditional formulas sometimes use higher doses up to 60g in combination with herbs like Yin Chen Hao (Artemisia capillaris) and Tian Ji Huang (Hypericum japonicum). When used as a simple tea infusion (rather than a decoction), 10g steeped in 1000ml of hot water is a standard ratio. The herb can also be incorporated into soups with meat and other ingredients for a gentler therapeutic effect.

Preparation

No special decoction handling is required. Bu Zha Ye is decocted normally with other herbs. It can also be simply steeped in boiling water as a tea. When sun-drying the raw herb, avoid prolonged exposure to intense direct sunlight, as this can degrade the active constituents.

Common Herb Pairs

These ingredients are traditionally combined with Bu Zha Ye for enhanced therapeutic effect

Shan Zha Bu Zha Ye 15g : Shan Zha 9g

Bu Zha Ye and Shan Zha (hawthorn fruit) together powerfully resolve food stagnation, especially from greasy and meat-heavy meals. Bu Zha Ye clears heat and drains dampness from the Stomach while Shan Zha's sour, warm nature strongly breaks down food accumulation, particularly fats and meats. Together they address both the stagnation and any heat it generates.

When to use: Overeating of greasy or rich foods with bloating, belching, and poor appetite. Also used in folk weight-management teas in southern China.

Mai Ya Bu Zha Ye 15g : Mai Ya 9g

Bu Zha Ye combined with Mai Ya (barley sprout) creates a gentle but effective digestive pair. Bu Zha Ye provides heat-clearing and dampness-draining actions while Mai Ya promotes the digestion of starchy foods and harmonizes the Stomach. Together they cover a broad range of food stagnation types.

When to use: General indigestion in children and elderly patients, especially from starchy or grain-based foods. Suitable for mild, ongoing digestive weakness.

Ji Nei Jin Bu Zha Ye 15g : Ji Nei Jin 10g

Bu Zha Ye and Ji Nei Jin (chicken gizzard lining) together strongly promote digestion. Ji Nei Jin is one of the most potent digestive herbs, capable of dissolving even hardened food masses, while Bu Zha Ye adds heat-clearing and dampness-draining support. This pair addresses stubborn food stagnation with accompanying damp-heat.

When to use: Severe food stagnation with abdominal distension, foul belching, poor appetite, and children's indigestion with bad breath and sour-smelling stools.

Yin Chen Bu Zha Ye 15-30g : Yin Chen Hao 15-30g

Bu Zha Ye and Yin Chen Hao (Artemisia capillaris) together target damp-heat jaundice. Yin Chen Hao is the primary herb for clearing damp-heat from the Liver and Gallbladder and resolving jaundice, while Bu Zha Ye supports by draining dampness and clearing heat from the Spleen and Stomach level. Together they address jaundice from both the Liver/Gallbladder and the Spleen/Stomach.

When to use: Damp-heat jaundice (yang jaundice) with bright yellow skin and eyes, dark urine, and digestive symptoms. Traditional Lingnan folk remedy for acute hepatitis.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Bu Zha Ye vs Shan Zha

Both promote digestion and relieve food stagnation, but Shan Zha is warm and sour with a much stronger fat- and meat-dissolving action, making it the first choice for meat and greasy food stagnation. Bu Zha Ye is cool with added heat-clearing and dampness-draining properties, making it more appropriate when food stagnation is accompanied by damp-heat symptoms such as diarrhea, fever, or jaundice. Bu Zha Ye is milder overall and better suited for regular use as a preventive tea.

Bu Zha Ye vs Lai Fu Zi

Both relieve food stagnation affecting the Stomach, but Lai Fu Zi (radish seed) is acrid and neutral, with a stronger Qi-descending and phlegm-resolving action that also addresses cough with phlegm from food stagnation. Bu Zha Ye focuses more on clearing heat and dampness alongside its digestive action, and it lacks the Qi-descending power of Lai Fu Zi. Lai Fu Zi is better for food stagnation with bloating and belching; Bu Zha Ye is better when heat and dampness dominate.

Bu Zha Ye vs Gu Ya

Both are gentle digestive herbs suitable for children and the elderly, but Gu Ya (rice sprout) is sweet and neutral, primarily harmonizing the Stomach and promoting digestion of rice and starchy foods without any heat-clearing effect. Bu Zha Ye adds the dimension of clearing heat and draining dampness, making it more useful in hot, humid climates and for damp-heat digestive disorders. Gu Ya is milder and purely tonifying to digestion.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Bu Zha Ye

Bu Zha Ye is a relatively common and affordable herb in southern China, so deliberate adulteration is uncommon. However, leaves from other plants may occasionally be mixed in during wild harvesting. The authentic herb can be identified by its stellate (star-shaped) hairs on the leaf veins and petiole, three prominent basal veins, finely toothed margins, and a papery texture that breaks easily. Under microscopic examination, the presence of both stellate trichomes and single-celled non-glandular hairs, along with calcium oxalate prisms and cluster crystals, confirms authenticity.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any herb.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Bu Zha Ye

Non-toxic

Classical sources record this herb as non-toxic (无毒). The Chinese Pharmacopoeia does not assign a toxicity classification to Bu Zha Ye, and it is widely consumed as a daily herbal tea beverage in southern China with no reported adverse effects at normal dosages. Phytochemical analysis shows it contains flavonoids, alkaloids, organic acids, tannins, and polyphenols. While piperidine alkaloids have been isolated from the plant in laboratory research, these are present in very low concentrations in the leaf when used as a standard decoction or tea, and there are no documented cases of toxicity from normal dietary or medicinal use.

Contraindications

Situations where Bu Zha Ye should not be used or requires extra caution

Caution

Spleen and Stomach deficiency-cold patterns (with chronic diarrhea from cold, poor appetite without heat signs). Bu Zha Ye is cool in nature and may further weaken the digestive system when the underlying problem is cold deficiency rather than damp-heat.

Caution

Prolonged or excessive use in individuals with no heat or food stagnation signs. As a cooling herb, extended use without appropriate indication may injure Spleen and Stomach Yang over time.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific pregnancy contraindication is listed in the Chinese Pharmacopoeia for Bu Zha Ye. However, as a cooling herb, it should be used with caution during pregnancy, especially in women with cold-deficient constitutions. There is insufficient formal safety data on its use during pregnancy. As with all medicinal herbs, pregnant women should consult a qualified practitioner before use.

Breastfeeding

No specific contraindication for breastfeeding is recorded in classical or modern Chinese pharmacological sources. Bu Zha Ye has long been consumed as a daily herbal tea in southern China by the general population, including nursing mothers. However, formal safety studies on transfer of active compounds through breast milk have not been conducted. Use at standard tea-drinking doses is generally considered acceptable, but medicinal doses should be discussed with a practitioner.

Children

Bu Zha Ye has a long tradition of safe use in children in the Lingnan region. It is commonly given to children as a mild herbal tea for food stagnation, hiccups, and poor appetite. Dosage for children should be reduced proportionally based on age and body weight, typically one-third to one-half of the adult dose. The herb's mild, non-toxic nature makes it one of the gentler digestive herbs suitable for pediatric use. Soups combining Bu Zha Ye with duck gizzard and other digestive herbs are a traditional children's remedy in Guangdong for bloating and milk regurgitation in infants.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Bu Zha Ye

No well-documented pharmaceutical drug interactions have been established for Bu Zha Ye in peer-reviewed literature. However, the herb contains tannins, flavonoids, and polyphenols which theoretically could affect the absorption of certain medications if taken simultaneously. As a general precaution, it is advisable to separate intake of Bu Zha Ye decoctions from oral medications by at least one hour.

The herb's flavonoid content (particularly vitexin, isovitexin, and narcissin) may have mild effects on liver enzyme activity, though this has not been clinically demonstrated to cause significant interactions. Patients on medications metabolized by the liver should mention their use of this herb to their healthcare provider.

Dietary Advice

Foods and dietary considerations when taking Bu Zha Ye

When using Bu Zha Ye to address damp-heat conditions, avoid greasy, fried, sugary, and cold or icy foods and drinks, as these can generate or worsen dampness. Alcohol should also be avoided. Light, easily digestible foods support the herb's digestive actions. When taking the herb for food stagnation, reducing overall food intake temporarily will enhance its effectiveness.

Botanical Description

Physical characteristics and morphology of the Bu Zha Ye source plant

Microcos paniculata L. (formerly placed in the Tiliaceae family, now classified under Malvaceae) is an evergreen shrub or small tree growing 3 to 12 metres tall. It has grey-black bark and young branches covered with star-shaped (stellate) fine hairs. The leaves are thin and leathery, egg-shaped to oblong (ovate-oblong), 8 to 18 cm long and 4 to 8 cm wide, with finely toothed margins and three prominent veins at the base. The plant flowers from June to August with small blossoms, and produces fruit from August to October.

It grows naturally in hilly terrain, forest margins, roadsides, and sparse woodland in tropical and subtropical regions. It thrives in warm, humid climates, tolerates some drought, and prefers well-drained, deep, fertile soils. In southern China, it is a common sight on low hillsides near Guangzhou and throughout the Lingnan (southern coastal) region.

Sourcing & Harvesting

Where Bu Zha Ye is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Summer and autumn (approximately June through October). Leaves are collected, stripped of stems and debris, then shade-dried or sun-dried (avoiding intense direct sunlight).

Primary growing regions

Primarily produced in Guangdong province (especially Yangxi county and Zhanjiang), which is considered the daodi (terroir) region for highest quality Bu Zha Ye. Also found in Guangxi, Hainan, Yunnan, Fujian, and Guizhou provinces. The herb thrives in the warm, humid climate of southern China. Guangdong has the widest distribution, greatest production volume, and most abundant resources. Yangxi county in Guangdong has established a standardized cultivation base for this herb.

Quality indicators

Good quality dried Bu Zha Ye leaves, when flattened from their typically wrinkled or crumbled state, are egg-shaped to oblong, 8 to 18 cm long and 4 to 8 cm wide. The surface colour should be yellow-green, greenish-brown, or yellow-brown. The leaf tip tapers to a point, the base is rounded and slightly asymmetrical, and the margins have fine teeth. Three basal veins should be clearly visible, with feather-like secondary veins and a net-like pattern of smaller veins. The leaf stalk and veins should have fine hairs. The texture is papery and easily broken. The aroma should be faint, and the taste mild, slightly sour and astringent. Avoid leaves that are excessively darkened, mouldy, or have more than 2% impurities (stems and debris).

Classical Texts

Key passages from the classical Chinese medical texts that describe Bu Zha Ye and its therapeutic uses

Sheng Cao Yao Xing Bei Yao (《生草药性备要》) by He Kejian, Qing Dynasty

Original Chinese: 味酸，性平，无毒，解一切蛊胀，清黄气，消热毒。作茶饮，去食积。又名布渣。

English translation: Sour in taste, neutral in nature, non-toxic. Resolves all kinds of abdominal distension due to toxins, clears jaundice, disperses heat-toxin. Taken as a tea, it removes food stagnation. Also called Bu Zha.

Ben Cao Qiu Yuan (《本草求原》), 1848

Original Chinese: 即破布叶，酸甘，平。解一切蛊胀药毒，清热，消食积，黄疸。作茶饮佳。

English translation: Also known as Po Bu Ye. Sour and sweet, neutral in nature. Resolves all kinds of abdominal distension and drug toxins, clears heat, disperses food stagnation and jaundice. Excellent when taken as a tea.

Guangdong Tong Zhi (《广东通志》)

Original Chinese: 破布叶出阳江阳春恩平，状如掌而绿，岭南舟人多用，香烟毒水迷客，煎汤服之立解。

English translation: Po Bu Ye comes from Yangjiang, Yangchun, and Enping. Its leaves are palm-shaped and green. Boatmen of the Lingnan region use it widely. When people are overcome by toxic smoke or poisoned water, drinking a decoction of the leaves brings immediate relief.

Historical Context

The history and evolution of Bu Zha Ye's use in Chinese medicine over the centuries

Bu Zha Ye is a quintessential Lingnan (southern Chinese coastal region) folk herb. Its medicinal use was first documented in the Qing Dynasty by He Kejian in the Sheng Cao Yao Xing Bei Yao (《生草药性备要》), under the name "Po Bu Ye" (破布叶, meaning "torn cloth leaf"). The name comes from the herb's appearance: the dried leaves are brittle and easily break into pieces, resembling torn fabric. The formal name "Bu Zha Ye" was established in 1848 in the Ben Cao Qiu Yuan (《本草求原》).

For generations, people in Guangdong and neighbouring provinces brewed Bu Zha Ye as a daily summer beverage to clear heat and aid digestion. It became one of the key ingredients in the famous Wanglaoji (王老吉) herbal cooling tea, first created in 1828, which remains one of China's best-selling herbal drinks today. In 2010, China's Ministry of Health officially approved Bu Zha Ye as an ingredient for cooling tea beverages, and the Chinese Pharmacopoeia (2010 edition) formally included it as a standard medicinal substance. The herb had previously appeared in the 1977 edition of the Pharmacopoeia and in the Guangdong Provincial Chinese Medicine Standards.

Historically, it was valued not only as a digestive aid but also as an antidote. The Guangdong Tong Zhi records that Lingnan boatmen used it to counteract poisoning from toxic smoke or contaminated water, reflecting its role in the folk medicine of a region with challenging subtropical conditions.

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Bu Zha Ye

Comprehensive review on botany, traditional uses, phytochemistry and pharmacology of Microcos paniculata (2019)

Jiang YQ, Liu EH. Chinese Journal of Natural Medicines, 2019, 17(8): 561-574.

This systematic review summarized the traditional medicinal uses, plant chemistry, and pharmacological activities of Microcos paniculata. The plant was found to contain flavonoids, alkaloids, triterpenoids, and organic acids. Reported pharmacological activities include antidiarrheal, antimicrobial, anti-inflammatory, hepatoprotective, cardiovascular protective, blood lipid-lowering, analgesic, jaundice-relieving, and fever-reducing effects.

Hepatoprotective effect of polyphenol-enriched fraction from Folium Microcos on acetaminophen-induced liver injury in mice (Preclinical study, 2017)

Wu H, Zhang G, Huang L, Pang H, Zhang N, Chen Y, Wang G. Oxidative Medicine and Cellular Longevity, 2017, 2017: 3631565.

This preclinical study investigated a polyphenol-rich fraction from Bu Zha Ye leaves and found it demonstrated strong free radical scavenging activity and protected liver cells from oxidative damage. In mice with acetaminophen-induced liver injury, the extract reduced liver damage markers by activating the Nrf2 antioxidant defense pathway and suppressing apoptotic signaling. Key phenolic compounds identified included narcissin, isorhamnetin-3-O-beta-D-glucoside, isovitexin, and vitexin.

PubMed

Angiogenesis-inhibitory piperidine alkaloids from the leaves of Microcos paniculata (Preclinical study, 2022)

Wu ZL, Zhang WY, Zhong JC, Huang XJ, Xu W, Chen MF, Weng SQ, Zhang DM, Che CT, Ye WC, Wang Y. Journal of Natural Products, 2022, 85(2): 375-383.

Researchers isolated eight new piperidine alkaloids from Bu Zha Ye leaves and tested their effects on blood vessel formation. One compound showed concentration-dependent inhibition of tube formation in human umbilical vein endothelial cells, suggesting potential anti-angiogenic properties that could be relevant to cancer research.

Anti-inflammatory, analgesic and antipyretic activities of Microcos paniculata barks and fruits (Preclinical study, 2015)

Aziz MA. Journal of Integrative Medicine, 2015, 13(3): 173-184.

This study evaluated extracts of Microcos paniculata bark and fruit for anti-inflammatory, pain-relieving, and fever-reducing effects in animal models. The extracts contained carbohydrates, alkaloids, saponins, tannins, flavonoids, and triterpenoids, and demonstrated significant anti-inflammatory effects in ear edema and granuloma tests, analgesic effects in formalin and writhing tests, and antipyretic effects in yeast-induced fever models.

PubMed

Apigenin C-glycosides of Microcos paniculata protect against LPS-induced acute lung injury through TLR4 signaling pathway (Preclinical study, 2018)

Li K, He Z, Wang X, Pineda M, Chen R, Liu H, Ma K, Shen H, Wu C, Huang N, Pan T, Liu Y, Guo J. Free Radical Biology and Medicine, 2018, 124: 163-175.

This study found that apigenin C-glycosides (ACGs) extracted from Bu Zha Ye leaves protected against lipopolysaccharide-induced acute lung injury in animal models. The mechanism involved modulation of the TLR4 inflammatory signaling pathway, supporting the herb's traditional use for upper airway infections.

PubMed

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.