Ingredient Processed / Derived product (加工品 jiā gōng pǐn)

Er Cha

Catechu · 儿茶

Acacia catechu (L.f.) Willd. · Catechu

Also known as: Hai Er Cha (孩儿茶), Er Cha Gao (儿茶膏), Hei Er Cha (黑儿茶),

Er Cha (Catechu) plant

Images shown are for educational purposes only

Catechu is a dried extract from the Acacia catechu tree, used primarily for healing stubborn wounds, stopping bleeding, and drying weeping skin conditions. It is applied externally as a powder for sores, ulcers, eczema, and mouth sores, and taken internally in small doses for bleeding or coughs with yellow phlegm. Despite its name, it is not a tea but a concentrated herbal paste with strong astringent and wound-healing properties.

Category Substances for external application (外用药) Astringent herbs that stop bleeding (收敛止血药)
Therapeutic focus Skin and Wound Care Skin Health Oral and Dental Health Bleeding Disorders

TCM Properties

Temperature

Cool

Taste

Bitter (苦 kǔ), Astringent (涩 sè)

Channels entered

Heart, Lungs

Parts used

Processed / Derived product (加工品 jiā gōng pǐn)

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Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Ingredient Does

Every ingredient has a specific set of actions — here's what Er Cha does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Er Cha is primarily used to support these areas of health:

Skin and Wound Care Skin Health Oral and Dental Health Bleeding Disorders

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Er Cha performs to restore balance in the body:

Stops bleeding and promotes tissue regeneration Absorbs Dampness and Heals Sores Invigorates Blood and Alleviates Pain Clears Lung Heat and Transforms Phlegm

How these actions work

'Stops bleeding and promotes tissue regeneration' means Er Cha can both halt bleeding and encourage the growth of new tissue over wounds. Its astringent taste gives it a natural ability to constrict and bind, which helps control bleeding from cuts, trauma, or internal hemorrhage. It is used both internally (for vomiting blood, nosebleeds, blood in the stool or urine) and applied directly to wounds as a powder.

'Absorbs dampness and closes sores' refers to its ability to dry out weeping, oozing skin lesions and promote their healing. This is the action Er Cha is most famous for. When sores, ulcers, or eczema patches are slow to heal and continue to seep fluid, Er Cha's astringent and slightly cooling nature helps dry the area, reduce inflammation, and encourage the skin to close over. It is commonly applied as a fine powder mixed with other herbs.

'Invigorates Blood and stops pain' means that despite being astringent, Er Cha also has a bitter taste that can move stagnant Blood and relieve pain from traumatic injuries. This is why it appears in famous trauma formulas. It enters the Heart channel, which governs Blood circulation, allowing it to disperse bruising and blood stasis from falls and blows.

'Clears Heat from the Lungs and resolves Phlegm' refers to its cooling, bitter nature acting on the Lung channel to clear Heat and transform thick, yellow Phlegm. This action is used for coughs with yellow sputum caused by Lung Heat. It can also address mouth sores, sore throat, and other signs of upper body Heat.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Er Cha is used to help correct these specific patterns.

Why Er Cha addresses this pattern

Er Cha's cool temperature and bitter, astringent tastes directly counter Damp-Heat lodged in the skin. Its bitter taste drains Dampness and clears Heat, while its astringent quality absorbs seepage and tightens tissue. When Damp-Heat causes weeping eczema, persistent sores, or ulcers that ooze fluid and refuse to heal, Er Cha dries the dampness, cools the inflammation, and promotes the growth of new tissue. It enters the Heart and Lung channels, both of which are connected to skin health in TCM (the Lung governs the skin, the Heart governs Blood).

A practitioner would look for one or more of these signs

Eczema

Weeping, oozing lesions

Ulcer

Chronic non-healing sores

Skin Rashes

Red, inflamed, moist skin lesions

Commonly Used For

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

Arises from: Damp-Heat in the Liver

TCM Interpretation

TCM views eczema primarily as an accumulation of Dampness and Heat in the skin. The Spleen's failure to transform fluids properly allows Dampness to accumulate, while Heat (from dietary, emotional, or external factors) combines with this Dampness and pushes outward to the skin surface. This produces the characteristic red, itchy, weeping lesions. When lesions ooze fluid and refuse to dry up, Dampness is dominant. When they are red, hot, and inflamed, Heat predominates. Chronic cases may also involve Blood Deficiency leading to dryness and thickened skin.

Why Er Cha Helps

Er Cha directly addresses the Dampness and Heat trapped in the skin. Its cool temperature clears Heat, while its astringent and bitter tastes absorb moisture and dry Dampness from the weeping lesions. Applied topically as a powder, it creates a drying, protective layer over the affected skin that promotes healing. Its tissue-regenerating action (生肌) encourages new skin growth once the Dampness is resolved. It is typically combined with herbs like calcined Longgu (Dragon Bone) and Qing Fen (Calomel) for this purpose.

Also commonly used for

Ulcer

Chronic non-healing sores and ulcers

Hemorrhoids

Painful, swollen hemorrhoids

Nosebleeds

Epistaxis from Blood Heat

Hemoptysis

Coughing blood from Lung Heat

Hypochondrial Pain That Is Worse On Coughing And Breathing

Productive cough with yellow phlegm from Lung Heat

Diarrhea

Chronic diarrhea with blood, not acute dysentery

Tonsillitis

Acute tonsillitis with swelling and pain

Bleeding

Abnormal uterine bleeding (崩漏)

Ingredient Properties

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

Temperature

Cool

Taste

Bitter (苦 kǔ), Astringent (涩 sè)

Channels Entered

Heart Lungs

Parts Used

Processed / Derived product (加工品 jiā gōng pǐn)

Dosage & Preparation

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

Standard dosage

1–3g

Maximum dosage

Up to 3g internally per day as decoction (wrapped for decoction) or in pill/powder form. External use has no strict upper limit. The herb is not typically used at high internal doses.

Dosage notes

Er Cha is used internally at low doses (1 to 3g) and more commonly applied externally as a powder. For internal use, it is typically taken as pills or powder (each dose 0.3 to 1g) rather than in standard decoctions, as its astringent extract dissolves poorly in boiling water. When included in a decoction, it should be wrapped in cloth (包煎) to prevent it from making the liquid cloudy and sticky. For external use, the appropriate amount of finely ground powder is sprinkled on wounds, mixed into pastes for sores and ulcers, or blended with borax for mouth sores. Different clinical applications: - Hemostasis (stopping bleeding): often combined with Long Gu, Bai Ji, and Xue Jie as a topical powder. - Mouth sores and gum disease: ground to fine powder with Bing Pian and/or Peng Sha, applied directly. - Phlegm-Heat cough: taken internally as pills with appropriate formula partners. - Diarrhea and dysentery: small internal doses in pill form.

Preparation

When used in decoction, Er Cha must be wrapped in cloth (包煎, bao jian) before adding to the pot, because the sticky, resinous extract will otherwise dissolve into a cloudy, gummy mess that is difficult to strain and unpleasant to drink. More commonly, Er Cha is ground into fine powder and taken directly in pill or powder form (0.3 to 1g per dose), or dissolved into the strained decoction liquid at the end. For external use, it is simply ground to a fine powder and applied directly to wounds, sores, or mixed with other powdered herbs and a binding agent (oil, honey, glycerin, or saliva as classical texts sometimes specify).

Common Ingredient Pairs

These ingredients are traditionally combined with Er Cha for enhanced therapeutic effect

Xue Jie
Xue Jie Xue Jie 30g : Er Cha 7g (as in Qi Li San proportions)

Er Cha and Xue Jie (Dragon's Blood resin) together powerfully stop bleeding and disperse Blood Stasis while promoting tissue regeneration. Xue Jie is the primary Blood-stasis disperser and pain reliever, while Er Cha adds astringent hemostatic action and promotes healing of damaged tissue. Together they address both the bleeding and the bruising of traumatic injuries.

When to use: Traumatic injuries with both active bleeding and bruising/swelling, chronic non-healing wounds, or sores that bleed and ooze simultaneously.

Bing Pian
Bing Pian 1:1 or Er Cha in larger proportion depending on the condition

Er Cha absorbs dampness and promotes tissue healing, while Bing Pian (Borneol) clears Heat, relieves pain, and penetrates deeply into tissue. Together they clear local Heat and inflammation, relieve pain, and promote the closure of chronic sores and ulcers. Bing Pian's penetrating quality enhances Er Cha's wound-healing action.

When to use: Chronic non-healing sores, genital ulcers, oral inflammation, and skin lesions that are hot, painful, and slow to close.

Bai Ji
Bai Ji Equal parts, ground to fine powder

Both Er Cha and Bai Ji (Bletilla tuber) are potent hemostatic herbs. Bai Ji is highly astringent and generates tissue, particularly effective for bleeding from the Lungs and Stomach. Combined with Er Cha, the hemostatic effect is greatly enhanced, addressing both external wound bleeding and internal hemorrhage such as coughing blood.

When to use: External traumatic bleeding or internal bleeding such as hemoptysis (coughing blood) or hemorrhage from the digestive tract.

Peng Sha
Peng Sha 1:1 (equal parts, as recorded in the Ben Cao Gang Mu)

Er Cha clears Heat and promotes tissue healing, while Peng Sha (Borax) clears Heat-Toxin and relieves swelling in the mouth and throat. Together they form an effective topical treatment for oral and dental conditions, drying ulcers and clearing local infection.

When to use: Mouth sores (口疮), gum disease (牙疳), and throat inflammation. Applied as a topical powder directly to the oral lesion.

Key Formulas

These well-known formulas feature Er Cha in a prominent role

Qi Li San 七厘散 Assistant

Qi Li San (Seven-Thousandths Powder) from the Liang Fang Ji Yi is the most famous trauma formula in Chinese medicine. Er Cha serves as assistant, contributing its astringent, hemostatic, and tissue-regenerating properties alongside Blood-moving herbs like Xue Jie, Ru Xiang, and Mo Yao. This formula showcases Er Cha's dual ability to stop bleeding while promoting wound healing.

Comparable Ingredients

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

Ming Fan
Er Cha vs Ming Fan

Both Er Cha and Ming Fan (Alum) absorb dampness and dry weeping sores. However, Ming Fan is stronger at resolving toxicity, killing parasites, and stopping itching, making it better for itchy, infected, or parasitic skin conditions. Er Cha is better at promoting tissue regeneration and healing chronic non-healing sores, and it can also stop bleeding and invigorate Blood, actions Ming Fan does not share.

Xue Jie
Er Cha vs Xue Jie

Both stop bleeding and promote tissue healing for traumatic injuries. However, Xue Jie (Dragon's Blood) is much stronger at invigorating Blood and dispersing stasis, making it the primary choice when pain and bruising dominate. Er Cha has a cooler nature and stronger astringent action, making it more suitable when there is active oozing, weeping, or Heat in the wound. In practice, they are often used together rather than as substitutes.

Wu Bei Zi
Er Cha vs Wu Bei Zi

Both are astringent substances used to stop bleeding and treat sores. Wu Bei Zi (Gallnut) is more strongly astringent and is primarily used for chronic diarrhea, sweating, and seminal emission as an internal astringent, plus external sores. Er Cha has the additional ability to clear Heat, invigorate Blood, and resolve Phlegm, giving it a broader therapeutic range for trauma, Lung Heat coughs, and mouth sores.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Er Cha

The most important distinction is between two different botanical sources that are both traded as "Er Cha": 1. Black Catechu (Hei Er Cha, 黑儿茶): From Acacia catechu heartwood. This is the primary pharmacopoeia-listed source. Surface is black or dark brownish-red with a glossy sheen. Taste is astringent, then bitter, then slightly sweet. 2. Gambir / Brown Catechu (Fang Er Cha, 棕儿茶 or 方儿茶): From Uncaria gambir (a Rubiaceae plant, completely different family). Typically comes in neat square blocks, brownish in colour without the same glossy surface. Contains similar catechin compounds but also contains distinct alkaloids (gambirine and others) not found in Acacia catechu. Historically both have been used medicinally, but they are not identical. The Chinese Pharmacopoeia specifies the Acacia catechu source. Authentic Acacia catechu extract can be verified by the matchstick test: a matchstick dipped in its water solution and dried, then dipped in hydrochloric acid and heated near a flame, turns a deep red colour.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Er Cha

Non-toxic

Er Cha is classified as non-toxic in classical sources. The Ben Cao Gang Mu states its nature is "bitter, neutral, non-toxic" (苦平无毒). The Chinese Pharmacopoeia lists no specific toxicity warnings for the standard medicinal product. However, one of its metabolic components, pyrocatechol (焦性儿茶酚), has shown toxicity in animal studies at high doses: oral administration to cats and rats at 50 mg/kg caused convulsions and death, while chronic dosing at 30 mg/kg caused anemia, jaundice, and kidney damage. These doses far exceed anything encountered in normal clinical use. At standard medicinal dosages (1 to 3g), the whole extract is considered safe. The tannin content, while therapeutically useful, means that very large or prolonged doses could theoretically irritate the gastrointestinal tract or interfere with nutrient absorption. Use within recommended dose ranges ensures safety.

Contraindications

Situations where Er Cha should not be used or requires extra caution

Avoid

Cold-Damp patterns (寒湿证): Er Cha is cool and astringent in nature. Using it in people with Cold-Damp conditions (such as watery diarrhea from Spleen Yang deficiency, or cold-type oozing sores) can worsen the condition by further congealing Dampness.

Caution

Yin-deficiency with internal Heat and no Dampness: The astringent nature of Er Cha may trap residual Heat or pathogenic factors inside the body. It is best avoided when the pattern is one of Yin deficiency with dry Heat and no dampness or oozing to address.

Caution

Active bleeding from Blood Heat without concurrent wound or ulcer: Er Cha is primarily an external hemostatic and astringent. For internal bleeding caused by Blood Heat, cooling and Blood-moving herbs are more appropriate, and Er Cha's astringency may retain stasis.

Avoid

Known allergy to Acacia catechu or related Fabaceae (legume) family plants: Individuals with sensitivity should avoid use.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

There is limited specific data on the safety of Er Cha during pregnancy. Classical sources do not list it as a forbidden herb in pregnancy, and its primary traditional use is external (wound powders, mouth rinses). However, given the lack of formal safety studies in pregnant women and its astringent, cooling, and blood-moving properties (活血止痛 is listed among its actions in the Chinese Pharmacopoeia), caution is warranted. Internal use during pregnancy should only occur under professional guidance.

Breastfeeding

No specific studies exist on the transfer of Er Cha constituents (catechins, tannins) into breast milk. Because the herb is most commonly used externally or in very small internal doses (1 to 3g), systemic absorption is likely low. However, tannins can theoretically affect iron absorption, which is a concern for nursing mothers. Use during breastfeeding should be limited to external application or undertaken with professional guidance if taken internally.

Children

Er Cha has traditional use in pediatric conditions, particularly infantile malnutrition-Heat (疳热) and childhood digestive problems. Historical dosage for children's oral use: approximately 0.15g per dose for children around 1 year old, and 0.2g per dose for children over 2 years, taken 3 times daily. It is most commonly used externally in children for mouth sores and skin conditions (as a powder applied topically), which carries minimal risk. Internal use in children should be guided by a qualified practitioner and kept to low doses appropriate for age and weight.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Er Cha

Anticoagulant and antiplatelet medications: Er Cha has hemostatic (blood-stopping) and astringent properties. Theoretically, it could counteract the effects of blood-thinning medications such as warfarin, heparin, or aspirin. Conversely, given that one of its listed actions is "invigorating Blood" (活血), there is a theoretical dual risk. Concurrent use with anticoagulants should be monitored.

Iron supplements and iron-containing medications: Er Cha is very rich in tannins (20 to 50% catechutannic acid). Tannins are well known to bind dietary and supplemental iron, reducing its absorption. People taking iron supplements for anemia should separate the timing of Er Cha use from iron supplementation by at least 2 hours.

Antidiabetic medications: Preclinical research has shown catechins from Acacia catechu possess blood-sugar-lowering effects. Patients taking insulin or oral hypoglycemic drugs should be aware of the possibility of additive blood sugar reduction, though this is unlikely to be clinically significant at the low standard doses used in TCM.

Dietary Advice

Foods and dietary considerations when taking Er Cha

Because Er Cha is cool in nature and strongly astringent, people taking it internally should avoid excessive cold or raw foods that could compound its cooling effect, especially if there is any underlying Spleen weakness. The high tannin content means it is best not taken together with iron-rich foods or supplements, as tannins bind iron and reduce absorption. Avoid taking it with strongly alkaline foods or drinks, as alkaline conditions can degrade catechin compounds.

Botanical Description

Physical characteristics and morphology of the Er Cha source source material

Acacia catechu (L.f.) Willd. (now reclassified as Senegalia catechu) is a medium-sized deciduous, thorny tree of the Fabaceae (legume) family, growing 6 to 15 meters tall. The bark is dark greyish-brown to brown, rough, and characteristically peels off in long narrow strips. Branches are slender with pairs of small curved spines (hooked prickles) at the base of each leaf stalk.

The leaves are bipinnately compound (feather-like, doubly divided), with 9 to 30 pairs of secondary leaf branches (pinnae), each bearing 16 to 50 pairs of tiny oblong leaflets. Flowers are small, pale yellow to white, clustered in cylindrical spikes 5 to 10 cm long that arise from the leaf axils. The fruit is a flat, strap-shaped pod (5 to 8.5 cm long), shiny and purplish-brown, containing 3 to 10 seeds. Flowering occurs from about May to August, with pods ripening from November onward.

The tree is deciduous, shedding its leaves in the hot dry season. It naturally occurs in mixed deciduous forests and savannas on lower mountains and hills, favouring drier regions with sandy soils along riverbanks and watersheds, from sea level up to about 1500 meters altitude.

Sourcing & Harvesting

Where Er Cha is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Winter (December to March). Branches and trunk sections are harvested, bark removed, chopped into large blocks, boiled in water, and the decoction is concentrated and dried into a solid extract.

Primary growing regions

Native to South and Southeast Asia. The tree grows wild across the Indian subcontinent (India, Nepal, Pakistan), Myanmar, Thailand, and China's Yunnan province. In China, Yunnan (southern regions) is the primary producing area, with Hainan also having cultivation. Guangxi is another noted Chinese source region. Internationally, India remains the largest producer, particularly in the Himalayan foothills, the Western Ghats, and drier riverbank regions. The dao di (terroir) source in China is Yunnan, where the tree finds suitable tropical to subtropical climate conditions.

Quality indicators

Good quality Er Cha (the dried extract block) should be black to dark brownish-red on the surface with a smooth appearance and slight glossy sheen. The texture should be hard and brittle, breaking easily to reveal an uneven cross-section with fine pores and a lustrous interior that is brownish-red in colour. It should become sticky when exposed to moisture. The taste should be astringent first, then bitter, with a slight sweet aftertaste. There should be minimal odour. When burned, good quality catechu should foam and produce a fragrant smell. Smaller, more compact blocks with a moist lustre are considered superior. Large blocks that appear dry, scorched, or crumbly are of lower quality. According to Chinese Pharmacopoeia standards, the combined content of catechin and epicatechin should be no less than 21%.

Classical Texts

Key passages from the classical Chinese medical texts that describe Er Cha and its therapeutic uses

《本草纲目》(Ben Cao Gang Mu) — Li Shizhen, Ming Dynasty

Chinese: 清上膈热，化痰生津，涂金疮、一切诸疮，生肌定痛，止血收湿。

English: Clears Heat from the upper diaphragm, transforms Phlegm and generates fluids. Applied to blade wounds and all manner of sores, it promotes tissue regeneration, settles pain, stops bleeding, and absorbs Dampness.

《本经逢原》(Ben Jing Feng Yuan) — Zhang Lu, Qing Dynasty

Chinese: 孩儿茶，一名乌爹泥，性涩收敛，止血收湿，为金疮止痛生肌之要药。

English: Er Cha, also called Wu Die Ni, is astringent and binding in nature. It stops bleeding and absorbs Dampness, making it a key herb for settling pain and regenerating tissue in blade wounds.

《本草正》(Ben Cao Zheng) — Zhang Jiebin, Ming Dynasty

Chinese: 降火生津，清痰涎咳嗽，治口疮喉痹，烦热，止消渴，吐血，衄血，便血，尿血，湿热痢血，及妇人崩淋，经血不止，小儿疳热，口疳，热疮，湿烂诸疮，敛肌长肉，亦杀诸虫。

English: Descends Fire and generates fluids, clears Phlegm and coughing, treats mouth sores and throat obstruction, alleviates irritable Heat, stops excessive thirst, vomiting of blood, nosebleeds, blood in stool and urine, Damp-Heat dysentery with blood, as well as women's flooding and spotting, and unceasing menstrual bleeding. For children's accumulation Heat and mouth sores, hot sores, and weeping damp sores, it binds the flesh and grows new tissue, and also kills parasites.

《饮膳正要》(Yin Shan Zheng Yao) — Hu Sihui, Yuan Dynasty

Chinese: 去痰热，止渴，利小便，消食下气，清神少睡。

English: Eliminates Phlegm-Heat, quenches thirst, promotes urination, aids digestion and descends Qi, clears the spirit and reduces drowsiness.

Historical Context

The history and evolution of Er Cha's use in Chinese medicine over the centuries

Er Cha has an unusual history among Chinese herbs. Unlike most medicinal plants native to China, it originated from South and Southeast Asian trade. The name Wu Die Ni (乌爹泥), one of its oldest Chinese names, likely derives from a transliteration of a foreign word. Li Shizhen, in the Ben Cao Gang Mu (16th century, Ming Dynasty), recorded it under the "Earth" (土部) section as Wu Die Ni, noting it came from "southern foreign lands" such as Java, Siam (Thailand), and Laos, and that Yunnan had begun producing it locally. He described an early preparation method involving packing fine tea powder into bamboo tubes, sealing them, and burying them in muddy ditches to ferment before extracting and boiling the juice.

The name Hai Er Cha (孩儿茶, literally "child's tea") possibly arose from its traditional use in treating children's conditions, particularly infantile malnutrition (疳积) and mouth sores. Over time, the medicinal product became standardized as the concentrated decoction extract of Acacia catechu heartwood rather than the fermented tea preparation Li Shizhen described. In addition to the Acacia source, a related product called Fang Er Cha (方儿茶, "square catechu" or "gambir") is prepared from Uncaria gambir, a plant in the Rubiaceae family, and was historically imported as a substitute.

Culturally, catechu had enormous significance across Asia beyond medicine. In India and Southeast Asia, the heartwood extract (known as katha) has been used for centuries as a key ingredient in betel nut preparations (paan), as a textile dye producing the characteristic khaki-brown colour, and in leather tanning. It entered European trade by the 19th century as "cutch" or "terra japonica."

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Er Cha

1

Antioxidant, Anti-inflammatory, and Chemoprotective Properties of Acacia catechu Heartwood Extracts (Review, 2015)

Stohs SJ, Bagchi D. Phytotherapy Research, 2015, 29(6): 818-824.

A comprehensive review finding that Acacia catechu heartwood extracts, rich in catechin and epicatechin, show potent antioxidant activity in laboratory and animal studies. This antioxidant effect appears to underlie anti-inflammatory, tissue-protective, anti-tumor, and pain-relieving activities demonstrated in cell and animal models. The review noted that combination products containing A. catechu extract showed significant anti-inflammatory activity in people with knee osteoarthritis over 12 weeks, with no adverse effects. The authors emphasized that few human studies exist despite centuries of traditional use.

PubMed
2

Newer Insights into the Antidiarrheal Effects of Acacia catechu Willd. Extract in Guinea Pig (Preclinical, 2017)

Micucci M, Gotti R, Corazza I, et al. Journal of Medicinal Food, 2017, 20(6): 592-600.

This study analysed the chemical composition of Acacia catechu extract and tested its effect on intestinal muscle contractions in isolated guinea pig tissue. The extract, containing catechin and epicatechin, reduced the frequency and strength of colon muscle contractions in a dose-dependent manner, without affecting intestinal bacterial populations. The researchers concluded that catechu may benefit patients with non-bacterial diarrhea by calming intestinal motility, supporting its traditional antidiarrheal use.

3

Acacia catechu (L.f.) Willd.: A Review on Bioactive Compounds and Their Health Promoting Functionalities (Review, 2022)

Kumari M, et al. Plants (Basel), 2022, 11(22): 3091.

A broad review identifying the main phytochemicals in A. catechu including catechin, epicatechin, protocatechuic acid, taxifolin, gallic acid, quercetin, and procyanidins. The review summarized evidence for antimicrobial, antidiarrheal, antihyperlipidemic, antiulcer, antioxidant, antidiabetic, and anti-inflammatory properties from various preclinical studies. The authors noted that despite the wide range of reported pharmacological activities, clinical trial data and toxicity data in humans remain limited.

4

Acacia catechu Willd. Extract Protects Neuronal Cells from Oxidative Stress-Induced Damage (Preclinical, 2022)

Ferrara F, Ferroni C, Corazza I, et al. Antioxidants, 2022, 11(1): 81.

This laboratory study investigated whether A. catechu heartwood extract could protect nerve cells from oxidative damage. In human neuroblastoma cells and rat brain tissue slices exposed to hydrogen peroxide, the catechin-rich extract prevented cell death, reduced harmful reactive oxygen species, preserved mitochondrial function, and blocked the activation of cell death pathways (caspase-3). The findings suggest potential neuroprotective applications, though human studies are needed.

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.