Herb Whole plant / Aerial parts (全草 quán cǎo)

Zi Hua Di Ding

Violet herb · 紫花地丁

Viola yedoensis Makino · Herba Violae

Also known as: Dì Dīng (地丁), Dì Dīng Cǎo (地丁草), Zǐ Dì Dīng (紫地丁),

Zi Hua Di Ding (Violet herb) plant

Images shown are for educational purposes only

Zi Hua Di Ding (Violet herb) is a classic Chinese medicine herb for clearing heat and fighting infections. It is best known for treating boils, abscesses, and other red, swollen, painful skin conditions caused by Heat-toxins. It can be taken as a tea or decoction, or applied fresh directly to the skin.

Category Herbs that clear Heat and resolve Toxicity (清热解毒药)
Therapeutic focus Skin Health Infection Support Inflammation Support Immune Support

TCM Properties

Temperature

Cold

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels entered

Heart, Liver

Parts used

Whole plant / Aerial parts (全草 quán cǎo)

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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 Zi Hua Di Ding does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Zi Hua Di Ding is primarily used to support these areas of health:

Skin Health Infection Support Inflammation Support Immune Support

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Zi Hua Di Ding performs to restore balance in the body:

Clears Heat and Resolves Toxicity Cools the Blood and reduces swelling Resolves abscesses and disperses nodules

How these actions work

'Clears Heat and resolves toxins' is the primary action of this herb. In TCM, Heat-toxins accumulate in the body and produce red, swollen, hot, painful lesions such as boils (ding chuang), carbuncles, and abscesses. Zi Hua Di Ding's bitter and cold nature makes it especially powerful at draining this Fire-toxin. It is considered one of the most important herbs for treating ding chuang (boils with a hard, nail-like root deep in the skin). It can be taken internally as a decoction or applied externally as a fresh poultice.

'Cools the Blood and reduces swelling' refers to its ability to clear Heat from the Blood level. When Heat enters the Blood, it can cause intense redness, swelling, and inflammation. This herb enters the Heart channel (which governs the Blood) and the Liver channel (which stores Blood), allowing it to cool Blood-Heat directly and reduce inflammatory swelling. This is why it is used for conditions like erysipelas (dan du), red and swollen eyes from Liver Heat, and other conditions involving hot, inflamed tissues.

'Resolves abscesses and disperses nodules' means the herb helps break down areas where toxins and stagnant Blood have accumulated into lumps or pus-filled swellings. This applies to both external abscesses (skin boils and carbuncles) and internal abscesses (such as intestinal or breast abscesses). The herb's acrid taste helps disperse these accumulations, while its bitter, cold nature drains the underlying Heat.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Zi Hua Di Ding is used to help correct these specific patterns.

Why Zi Hua Di Ding addresses this pattern

Heat-toxin accumulation is the core pattern Zi Hua Di Ding addresses. When Fire-toxins gather and fester in the flesh, they produce boils, carbuncles, and abscesses that are red, swollen, hot, and painful. Zi Hua Di Ding's bitter and cold nature directly drains this Heat-toxin. Its entry into the Heart and Liver channels allows it to clear toxins from both the Blood (Heart governs Blood) and the tissues where the Liver channel distributes Qi. Its acrid taste helps disperse the toxin outward. This makes it one of the primary herbs chosen when Heat-toxins manifest as painful, deep-rooted skin lesions.

A practitioner would look for one or more of these signs

Boils

Red, hot, painful boils with hard root

Skin Abscess

Carbuncles and abscesses with pus

Skin Dryness

Localized redness and swelling

Fever

Fever accompanying the skin lesion

Commonly Used For

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

Arises from: Heat-Toxin Accumulation Blood Heat

TCM Interpretation

In TCM, inflammatory acne is understood as Heat-toxin accumulating in the skin, often driven by excess Heat in the Stomach and Lung channels (which govern the face and skin) or by Blood-Heat rising to the surface. Dietary factors like greasy and spicy food, emotional stress, and constitutional Heat all contribute. The red, painful, pus-filled lesions reflect Fire-toxin festering in the flesh, while the characteristic facial distribution reflects Heat rising upward.

Why Zi Hua Di Ding Helps

Zi Hua Di Ding directly clears the Heat-toxins that produce inflamed acne lesions. Its cold nature and bitter taste drain excess Heat, while its Blood-cooling action reduces the redness and swelling characteristic of inflammatory papules and pustules. In clinical practice, it is often combined with Jin Yin Hua (honeysuckle) and Pu Gong Ying (dandelion) in formulas like Wu Wei Xiao Du Yin to powerfully clear Heat-toxins from the skin. Modern research confirms its anti-inflammatory and antibacterial properties, which align with its traditional use for infected skin conditions.

Also commonly used for

Boils

Especially deep-rooted boils (ding chuang)

Skin Abscess

Carbuncles and purulent skin infections

Lumps

Acute mumps with parotid swelling

Red Eyes

Acute conjunctivitis with red, painful eyes

Appendicitis

Acute appendicitis as part of combined treatment

Insect Bites

Venomous snake and insect bites

Sore Throat

Acute sore throat from Heat-toxin

Urinary Tract Infection

Urinary tract infections with Heat signs

Herb Properties

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

Temperature

Cold

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels Entered

Heart Liver

Parts Used

Whole plant / Aerial parts (全草 quán cǎo)

Dosage & Preparation

These are general dosage guidelines for Zi Hua Di Ding — 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 30g in decoction (dry herb). When using the fresh herb, dosages of 30-60g may be used for acute conditions. External use: appropriate amount applied topically.

Dosage notes

The standard decoction dose is 15-30g of the dried herb. For fresh herb (used both internally and as a topical poultice), 30-60g may be employed. Higher doses within the range are used for acute, severe Heat-toxin conditions such as large boils, cellulitis, or snakebite. Lower doses are appropriate for milder conditions or as part of a multi-herb formula. External use involves crushing the fresh herb into a paste and applying it directly to the affected area. Because of its cold nature, the herb should not be taken at high doses for prolonged periods, especially in people with weak digestion. It is commonly combined with other Heat-clearing, toxin-resolving herbs such as Jin Yin Hua, Pu Gong Ying, Ye Ju Hua, and Lian Qiao to enhance effect.

Preparation

No special decoction handling required. Decoct normally with other herbs. When using the fresh herb externally, wash it and pound it into a paste for direct application to sores and swellings.

Common Herb Pairs

These ingredients are traditionally combined with Zi Hua Di Ding for enhanced therapeutic effect

Pu Gong Ying
Pu Gong Ying 1:1 (e.g. 15g : 15g)

Both herbs clear Heat-toxins and treat abscesses, but they complement each other: Zi Hua Di Ding excels at resolving deep-rooted boils (ding chuang) and cooling Blood-Heat, while Pu Gong Ying (dandelion) has stronger action in dispersing nodules and treating breast abscess. Together they provide broad-spectrum Heat-toxin clearing for both surface and internal abscesses.

When to use: Used for any Heat-toxin sore, carbuncle, or abscess, and especially when treating both boils and breast or intestinal abscesses simultaneously. This is one of the most classic pairings in external medicine.

Jin Yin Hua
Jin Yin Hua 2:1 (e.g. Jin Yin Hua 20g : Zi Hua Di Ding 10-15g)

Jin Yin Hua (honeysuckle) is the premier Heat-clearing and toxin-resolving herb that works through both the Qi and Blood levels. Combined with Zi Hua Di Ding, which excels at cooling Blood-Heat and resolving deep boils, the pair achieves powerful clearing of Heat-toxins across all levels. Jin Yin Hua also has a dispersing quality that helps push out external pathogens.

When to use: Used for severe Heat-toxin conditions with red, swollen, painful lesions, especially boils and carbuncles in their early stages. This pairing forms the backbone of Wu Wei Xiao Du Yin.

Ye Ju Hua
Ye Ju Hua 1:1 (e.g. 12g : 12g)

Ye Ju Hua (wild chrysanthemum) clears Liver Heat and resolves toxins, with particular strength in clearing Fire from the head and eyes. Combined with Zi Hua Di Ding's Blood-cooling action, the pair provides strong clearing of both Qi-level and Blood-level Heat-toxins, and is especially effective for toxic sores affecting the head and face.

When to use: Used for Heat-toxin sores on the head and face, red swollen eyes, or any situation where Heat-toxin affects the upper body. Both herbs appear together in Wu Wei Xiao Du Yin.

Lian Qiao
Lian Qiao 1:1 (e.g. 10g : 10g)

Lian Qiao (forsythia fruit) clears Heat, resolves toxins, and disperses accumulations, with a particular ability to vent Heat outward and disperse nodules. Paired with Zi Hua Di Ding's deep Blood-level toxin clearing, the combination addresses both the surface expression and the deep root of Heat-toxin conditions.

When to use: Used when Heat-toxin conditions are severe and accompanied by fever, or when nodules and lumps need to be dispersed alongside clearing toxins.

Key Formulas

These well-known formulas feature Zi Hua Di Ding in a prominent role

Wu Wei Xiao Du Yin 五味消毒飲 Deputy

Wu Wei Xiao Du Yin (Five-Ingredient Toxin-Clearing Drink) from the Yi Zong Jin Jian is the most iconic formula containing Zi Hua Di Ding. It combines five powerful Heat-clearing, toxin-resolving herbs (Jin Yin Hua, Ye Ju Hua, Pu Gong Ying, Zi Hua Di Ding, and Zi Bei Tian Kui Zi) to treat boils, carbuncles, and all manner of Heat-toxin skin lesions. Zi Hua Di Ding serves as a key deputy, contributing its Blood-cooling and toxin-resolving strength, particularly for deep-rooted boils. This formula perfectly showcases the herb's core identity as a treatment for Heat-toxin skin conditions.

Comparable Ingredients

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

Pu Gong Ying
Zi Hua Di Ding vs Pu Gong Ying

Both clear Heat-toxins and treat abscesses. However, Zi Hua Di Ding has stronger action for deep-rooted boils (ding chuang) and resolves snake venom. Pu Gong Ying has broader applications: it is stronger at dispersing nodules, particularly for breast abscess (ru yong), and also clears Damp-Heat from the Lower Burner to treat urinary conditions. Pu Gong Ying's range of clinical use is wider overall.

Jin Yin Hua
Zi Hua Di Ding vs Jin Yin Hua

Both are premier Heat-clearing, toxin-resolving herbs. Jin Yin Hua is sweeter and more versatile: it clears Heat at both the Qi and Blood levels, treats Wind-Heat exterior patterns, and is used across a wider range of infectious and febrile conditions. Zi Hua Di Ding is more focused on Blood-level Heat-toxins manifesting as deep skin lesions and abscesses, and is specifically prized for treating ding chuang (boils). For general Heat-toxin conditions, Jin Yin Hua is more broadly applicable; for severe localized skin infections, Zi Hua Di Ding is more targeted.

Ban Zhi Lian
Zi Hua Di Ding vs Ban Zhi Lian

Both clear Heat-toxins and can be used for swellings and sores. However, Ban Zhi Lian (Scutellaria barbata) has stronger action in invigorating Blood and resolving stasis, and is more commonly used in modern practice for tumors and cancer-related conditions. Zi Hua Di Ding is more specifically focused on acute infectious skin lesions, boils, and carbuncles, and has the additional ability to treat snakebite.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Zi Hua Di Ding

The commercial name "Di Ding" has historically been applied to several entirely different plant species, which is the primary source of confusion and adulteration: 1. Ku Di Ding (苦地丁, "Bitter Di Ding"): Corydalis bungeana (Papaveraceae/poppy family). This is likely the most common adulterant. It has a different chemical profile (contains alkaloids rather than flavonoids and coumarins) and stronger bitter taste. 2. Tian Di Ding (甜地丁, "Sweet Di Ding"): Gueldenstaedtia verna (Fabaceae/legume family). Morphologically distinct with compound leaves and hairy capsule-like fruits. 3. Guang Di Ding (广地丁): Gentiana loureirii (Gentianaceae/gentian family), used mainly in southern China. 4. Li Tou Cao (犁头草): Viola japonica or other Viola species that are closely related but technically different from the pharmacopoeia species. Authentic Zi Hua Di Ding (Viola yedoensis/philippica) can be distinguished by its lance-shaped basal leaves with winged petioles, violet flowers with a thin tubular spur, and faint sticky taste. TLC (thin-layer chromatography) testing under UV 365nm showing three characteristic fluorescent spots confirms identity per the Chinese Pharmacopoeia method.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Zi Hua Di Ding

Non-toxic

Zi Hua Di Ding is classified as non-toxic (无毒) in classical sources including the Ben Cao Gang Mu. At standard dosages it has no known toxic components requiring special caution. It is a whole-herb preparation (entire plant) with a long history of safe use as both medicine and an edible wild vegetable. No specific toxic constituents have been identified. However, as with all cold-natured herbs, excessive dosage or prolonged use in people without actual Heat-toxin conditions can cause digestive upset (loose stools, stomach discomfort) due to injury to Spleen and Stomach Yang.

Contraindications

Situations where Zi Hua Di Ding should not be used or requires extra caution

Caution

Spleen and Stomach deficiency Cold (脾胃虚寒): Zi Hua Di Ding is bitter, acrid, and cold in nature. In people with underlying Spleen-Stomach Cold deficiency, it may worsen digestive symptoms such as loose stools, poor appetite, and abdominal cold pain.

Caution

Yin-type sores and abscesses (阴疽漫肿无头): This herb is indicated for Heat-toxin sores that are red, hot, swollen, and painful. It should not be used for chronic, cold-type sores that are pale, diffuse, and without a defined head, as its cold nature can worsen such conditions.

Caution

Deficiency-Cold constitution without signs of Heat-toxin: In individuals who are generally cold-constituted and have no actual Heat or toxic accumulation, prolonged or high-dose use may damage Spleen and Stomach Yang, leading to diarrhea or loss of appetite.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific prohibition during pregnancy is recorded in classical or modern Chinese Pharmacopoeia sources. However, Zi Hua Di Ding is a bitter, cold herb that clears Heat-toxin. Cold-natured herbs taken in large or prolonged doses can potentially affect the Spleen and Stomach, which are critical for nourishing the fetus. Use during pregnancy should be limited to situations where clear Heat-toxin conditions are present and should be supervised by a qualified practitioner. Avoid unnecessary or long-term use.

Breastfeeding

No specific contraindication during breastfeeding is documented. However, as a bitter and cold herb, it could theoretically affect the nursing infant's digestion if the mother takes it in high doses over an extended period, as some constituents may transfer into breast milk. Short-term use at standard dosages for acute Heat-toxin conditions is generally considered acceptable under practitioner supervision. Discontinue if the infant develops loose stools or digestive disturbance.

Children

Zi Hua Di Ding may be used in children for appropriate Heat-toxin conditions (such as boils, skin infections, mumps) at reduced doses proportionate to age and body weight. A common approach is roughly one-third to one-half the adult dose for children under 12, adjusted by the practitioner. Because of its cold nature, it should be used cautiously in children with weak digestion or a tendency toward loose stools. Duration of use should be kept short.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Zi Hua Di Ding

No well-documented pharmaceutical drug interactions have been established for Zi Hua Di Ding in clinical literature. However, based on its known pharmacological profile, the following theoretical considerations apply:

  • Anticoagulant/antiplatelet drugs: Some in-vitro research has identified anticoagulant properties in V. yedoensis constituents. Concurrent use with warfarin, heparin, or antiplatelet agents should be monitored, though clinical significance is uncertain.
  • Immunosuppressants: The herb has demonstrated immune-modulating effects in preclinical studies. Theoretically, it could interfere with immunosuppressive therapy, though this remains unconfirmed in human studies.

Overall, clinically significant drug interactions have not been formally documented. Patients on multiple medications should consult their healthcare provider before use.

Dietary Advice

Foods and dietary considerations when taking Zi Hua Di Ding

While taking Zi Hua Di Ding, avoid excessive intake of cold and raw foods if the person already has a weak digestive system, as the herb's cold nature may compound digestive discomfort. Avoid greasy, rich, or heavily spiced foods during acute Heat-toxin conditions (boils, infections) as these can aggravate internal Heat. Light, easily digestible foods are recommended during treatment.

Botanical Description

Physical characteristics and morphology of the Zi Hua Di Ding source plant

Viola yedoensis Makino (also classified as Viola philippica) is a small perennial herb in the Violaceae (violet) family. It is stemless (acaulescent), typically growing only 4–14 cm tall during flowering and up to about 20 cm when fruiting. The short, erect rhizome is brownish and densely noded, producing several pale yellowish or whitish rootlets.

Leaves are all basal, forming a rosette. They are lance-shaped to narrowly egg-shaped, 1.5–6 cm long, with blunt tips, truncate to slightly heart-shaped bases, and bluntly serrated margins. Both surfaces may be smooth or finely hairy. The leaf stalks are slender and bear narrow wings along their upper portions. Flowers are solitary on slender stalks, with five petals coloured violet-purple (occasionally pale purple or white), the throat bearing purple veining. The lower petal extends into a distinctive narrow, tubular spur. The fruit is an elliptical capsule that splits into three valves when ripe, releasing many small, pale brownish seeds.

It is widely distributed across open grasslands, field margins, roadsides, and hillsides in temperate and subtropical regions of China, Japan, Korea, and the Russian Far East. It favours sunny positions with good drainage and is one of the earliest wildflowers to bloom in spring (April to May).

Sourcing & Harvesting

Where Zi Hua Di Ding is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Spring and autumn. Spring harvest (March to May, during or just before flowering) yields the highest concentration of active flavonoids and coumarins.

Primary growing regions

Zi Hua Di Ding is widely distributed across China and does not have a single dominant dao di (terroir) region the way some elite herbs do. It grows throughout the eastern half of China. Main production areas include Jiangsu, Zhejiang, and Anhui provinces (Yangtze River delta region), as well as Shandong, Henan, Hebei, and the northeastern provinces (Jilin, Liaoning, Heilongjiang). Jilin province is sometimes noted as a quality source. The herb also occurs in Shanxi, Shaanxi, Gansu, Hubei, Hunan, Jiangxi, Fujian, Sichuan, Guizhou, Yunnan, Guangxi, and Taiwan.

Quality indicators

The dried whole herb is typically crumpled into a ball shape. The taproot should be a pale yellowish-brown colour, 1-3 mm in diameter, with fine longitudinal wrinkles. When flattened, the leaves should appear grey-green, lance-shaped to egg-lance-shaped, 1.5-6 cm long and 1-2 cm wide, with blunt tips, slightly heart-shaped or truncate bases, blunt serrations, and visible fine hairs on both surfaces. Leaf stalks should show narrow wings along the upper portion. The flower stems are slender, and any remaining petals should show a violet-purple or light brownish colour with a distinctive fine tubular spur. Capsule fruits, if present, are elliptical or split into three valves, with many small pale brown seeds. The smell is faint, and the taste should be slightly bitter with a faint sticky quality. Good quality material has intact leaves and roots, a fresh grey-green colour (not yellowed or blackened), no mould, and no excessive foreign matter.

Classical Texts

Key passages from the classical Chinese medical texts that describe Zi Hua Di Ding and its therapeutic uses

《本草纲目》 (Běn Cǎo Gāng Mù) — Li Shizhen, Ming Dynasty

Chinese: 气味：苦、辛、寒、无毒。

English: Flavour and nature: bitter, acrid, cold, and non-toxic.

Chinese: 主治：一切痈疽发背，疔肿瘰疬，无名肿毒，恶疮。

English: Indications: all carbuncles and back abscesses, boils, scrofula, unnamed toxic swellings, and malignant sores.

《本草正义》 (Běn Cǎo Zhèng Yì) — Zhang Shanlei, Late Qing/Early Republic

Chinese: 地丁专为痈肿疔毒通用之药。

English: Di Ding is the all-purpose herb for carbuncles, swellings, boils, and toxic sores.

Historical Context

The history and evolution of Zi Hua Di Ding's use in Chinese medicine over the centuries

The name Zi Hua Di Ding (紫花地丁, "Purple Flower Earth Nail") first appeared in the Tang Dynasty text Qian Jin Fang (千金方, "Prescriptions Worth a Thousand Gold") by Sun Simiao. The "Di Ding" (earth nail) part of the name comes from the plant's upright flower stalk, said to resemble a small nail driven into the ground, topped with purple flowers. It was also known by folk names including Jian Tou Cao (箭头草, "Arrowhead Grass"), Du Xing Hu (独行虎, "Lone-Traveling Tiger"), and Tu Er Cao (兔耳草, "Rabbit-Ear Grass").

Li Shizhen in the Ben Cao Gang Mu (1578) was the first to give Zi Hua Di Ding its own dedicated entry, distinguishing it from other herbs called "Di Ding." This was an important clarification, as the name had long been used for several unrelated plants. Even today, the commercial market distinguishes several types: the authentic Zi Hua Di Ding (Violaceae, the violet family), Ku Di Ding or "bitter Di Ding" (Corydalis bungeana, poppy family), Tian Di Ding or "sweet Di Ding" (Gueldenstaedtia verna, legume family), and Guang Di Ding (Gentiana loureirii, gentian family). Each has different properties and should not be used interchangeably.

Throughout Chinese medical history, Zi Hua Di Ding has been regarded as a premier herb for treating boils and toxic sores (ding chuang). It is a key ingredient in the famous formula Wu Wei Xiao Du Yin (Five-Ingredient Toxin-Resolving Drink), where it is combined with Jin Yin Hua, Pu Gong Ying, Ye Ju Hua, and Tian Kui Zi to clear Heat-toxin and treat acute suppurative infections. It was first included in the Chinese Pharmacopoeia in 1977.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Zi Hua Di Ding

1

Anti-HIV Cyclotides from Viola yedoensis (In Vitro Study, 2008)

Ireland DC, Wang CKL, Wilson JA, Gustafson KR, Craik DJ. Journal of Natural Products, 2008, 71(9): 1668-1670.

Researchers at the University of Queensland identified five new and three known cyclotides (small cyclic peptides) from Viola yedoensis. These compounds showed anti-HIV activity in cell-based assays, with cycloviolacin Y5 being one of the most potent cyclotides tested against HIV at that time. The study provided evidence for the traditional use of this herb against infectious conditions, though clinical translation remains distant.

PubMed
2

Viola yedoensis Liposoluble Fraction Ameliorates LPS-Induced Acute Lung Injury in Mice (Preclinical, 2012)

American Journal of Chinese Medicine, 2012, 40(6): 1259-1272.

This study from Fudan University demonstrated that the petroleum ether fraction of V. yedoensis significantly reduced lung inflammation markers in a mouse model of acute lung injury induced by LPS. Treatment decreased wet-to-dry lung weight ratio, total inflammatory cells, and protein concentration in lung lavage fluid, supporting the herb's traditional anti-inflammatory reputation.

PubMed
3

Study on Antibacterial Active Components from Viola yedoensis (Preclinical, 2011)

Sun Y, Du L, Zhou L et al. China Journal of Chinese Materia Medica (Zhongguo Zhong Yao Za Zhi), 2011, 36: 2666-2671.

Researchers isolated coumarins (aesculetin, scopoletin, 6,7-dimethoxycoumarin, and a novel compound) from V. yedoensis and tested them against several bacterial pathogens. The compounds showed broad-spectrum antibacterial activity against Staphylococcus aureus, Streptococcus species, E. coli, and Salmonella. Aesculetin was the most active, with very low minimum inhibitory concentrations. The study concluded that coumarins are likely the main antibacterial constituents of this herb.

PubMed
4

Protective Effect of n-Butanol Extract from Viola yedoensis on Immunological Liver Injury (Preclinical, 2021)

Chem Biodivers, 2021.

This study found that the n-butanol extract of V. yedoensis protected against liver injury in both cell and mouse models. In vitro, it inhibited hepatitis B viral replication. In vivo, it reduced liver enzyme elevations (ALT, AST) and oxidative damage markers while improving antioxidant enzyme activity in a ConA-induced liver injury model. Key active compounds identified included esculetin and other coumarins.

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.