Herb Rhizome (根茎 gēn jīng)

Guan Zhong

Male fern rhizome · 贯众

Dryopteris crassirhizoma Nakai · Rhizoma Dryopteridis Crassirhizomae

Also known as: Mian Ma Guan Zhong (绵马贯众), Guan Jie (贯节)

Guan Zhong (Male fern rhizome) plant

Images shown are for educational purposes only

Guàn Zhòng is a fern-derived herb best known for its ability to expel intestinal parasites such as tapeworms and roundworms. It also clears infectious heat and toxins, making it a traditional choice for preventing and treating epidemic illnesses like influenza. In its charred form, it is commonly used to stop bleeding, particularly uterine bleeding.

Category Herbs that clear Heat and resolve Toxicity (清热解毒药)
Therapeutic focus Parasite Management Immune Support Bleeding Disorders Women's Health

TCM Properties

Temperature

Cool

Taste

Bitter (苦 kǔ)

Channels entered

Liver, Stomach

Parts used

Rhizome (根茎 gēn jīng)

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What This Herb Does

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

Therapeutic focus

In practical terms, Guan Zhong is primarily used to support these areas of health:

Parasite Management Immune Support Bleeding Disorders Women's Health

TCM Actions

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

Expels Parasites Clears Heat and Resolves Toxicity Cools the Blood and Stops Bleeding

How these actions work

'Kills parasites' means Guàn Zhòng has a direct toxic effect on intestinal worms, including tapeworms, roundworms, hookworms, and pinworms. It is one of the best-known antiparasitic herbs in TCM. The bitter, cold nature of the herb creates an inhospitable environment for parasites in the digestive tract. It is typically combined with other parasite-expelling herbs and purgatives to help the body eliminate the dead worms.

'Clears Heat and resolves toxins' means this herb can address conditions caused by Heat-toxins. Its bitter and cool properties enable it to clear excessive Heat from the Qi level and resolve toxic pathogenic factors. This is why it has been traditionally used to prevent and treat epidemic diseases such as influenza, measles, mumps, and other infectious illnesses. Folk practice includes soaking the herb in drinking water as a preventive measure during outbreaks.

'Cools Blood and stops bleeding' means Guàn Zhòng can address bleeding caused by Blood Heat, where Heat forces blood out of the vessels. It is used for nosebleeds, vomiting blood, blood in the stool, and especially uterine bleeding (崩漏). For stopping bleeding, the charred form (Guàn Zhòng Tàn) is preferred, as charring concentrates the astringent, hemostatic properties of the herb.

Patterns Addressed

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

Why Guan Zhong addresses this pattern

Guàn Zhòng's bitter and cool nature enables it to directly clear Heat-toxins from the body. Its affinity for the Liver and Stomach channels allows it to address toxic Heat that manifests in the Qi and Blood levels, causing fever, skin eruptions, sore throat, and swollen glands. The herb's Heat-clearing and toxin-resolving action is why it has been used for centuries to prevent and treat epidemic warm diseases (温病) including influenza, measles, and mumps.

A practitioner would look for one or more of these signs

Fever

High fever from epidemic warm diseases

Skin Rashes

Warm-Heat rashes and eruptions

Lumps

Swollen and painful parotid glands

Sore Throat

Sore, red, swollen throat

Commonly Used For

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

Arises from: Heat Toxin

TCM Interpretation

In TCM, influenza is understood as an invasion by epidemic warm-toxins (温疫毒邪) that attack the body's exterior and quickly penetrate to the Qi level, producing fever, headache, sore throat, and body aches. The pathogenic factor is a type of Heat-toxin that spreads easily from person to person. The Lung and Stomach are often the first organs affected, as they govern the body's surface defences and the digestive tract respectively.

Why Guan Zhong Helps

Guàn Zhòng's ability to clear Heat and resolve toxins directly targets the epidemic warm-toxins that drive influenza. Modern pharmacological research has confirmed that its decoction has inhibitory effects against multiple influenza virus strains. Traditionally, placing Guàn Zhòng in drinking water during epidemic outbreaks was a folk preventive measure. The herb's cool, bitter nature purges the Heat-toxin pathogen, while its Stomach channel affinity ensures the herb's active compounds reach the digestive and immune systems effectively.

Also commonly used for

Nosebleeds

Epistaxis due to Blood Heat

Lumps

Epidemic parotitis with red swelling and pain

Dysentery

Bloody dysentery from Damp-Heat

Measles

Prevention of measles during epidemics

Dark Blood In Stool

Intestinal bleeding from Heat

Cervicitis

Cervicitis with Damp-Heat

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

Bitter (苦 kǔ)

Channels Entered

Liver Stomach

Parts Used

Rhizome (根茎 gēn jīng)

Dosage & Preparation

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

Standard dosage

4.5-9g

Maximum dosage

Do not exceed 15g in decoction for internal use. Some sources permit up to 30g for external wash preparations (e.g. for pinworm). Strict dosage control is essential due to toxicity.

Dosage notes

Use lower doses (4.5-9g) for clearing Heat and resolving toxins or for prevention of epidemic diseases. For antiparasitic use, doses may be at the higher end of the range but should not exceed 15g internally. When used to stop bleeding, the herb should be charred (Guan Zhong Tan, 贯众炭) before use. For external application in pinworm treatment, up to 30g can be decocted for a warm perianal wash before sleep. Fatty or oily foods must be avoided during treatment, as dietary fat greatly increases absorption of the toxic compounds and raises the risk of adverse effects. The herb material should be fresh (less than one year old), as the active phloroglucinol compounds are unstable and degrade with storage.

Preparation

No special decoction handling is required for standard use. When used for stopping bleeding, the herb should be charred first (炒炭, chao tan): stir-fry the sliced pieces until the surface is scorched black, then sprinkle with a small amount of water and allow to cool. This charred form (Guan Zhong Tan) enhances the hemostatic effect. For external use against pinworms, decoct the herb separately and use the warm liquid as a perianal wash.

Processing Methods

In TCM, the same herb can be prepared in different ways to change its effects — here's how processing alters what Guan Zhong does

Processing method

Clean Guàn Zhòng slices are dry-fried (without additives) in a hot wok until they are charred black, then sprinkled with water and allowed to cool.

How it changes properties

Charring reduces the herb's cold nature and its toxicity, while concentrating its astringent and hemostatic properties. The charred form loses much of its volatile oil but retains tannins, which are key to its blood-stopping action. The original Heat-clearing and antiparasitic actions are reduced.

When to use this form

Use the charred form specifically for bleeding disorders, especially uterine flooding and spotting (崩漏), nosebleeds, blood in the stool, and postpartum hemorrhage. The raw form is preferred for antiparasitic use and Heat-toxin clearing.

Common Herb Pairs

These ingredients are traditionally combined with Guan Zhong for enhanced therapeutic effect

Huang Lian
Huang Lian Guàn Zhòng 30g : Huáng Lián 15g (2:1)

Guàn Zhòng and Huáng Lián together powerfully clear Heat-toxins and stop bleeding. Huáng Lián's strong Stomach and Heart Heat-clearing action complements Guàn Zhòng's Blood-cooling and hemostatic properties, creating a potent combination for acute vomiting of blood.

When to use: Acute hematemesis (vomiting blood) from Blood Heat, as in the classical formula Guàn Zhòng Sǎn from the Shèng Jì Zǒng Lù.

Bing Lang
Bing Lang 1:1

Guàn Zhòng kills intestinal parasites while Bīng Láng (areca seed) promotes downward movement in the intestines and expels the dead worms. Together they address both the killing and elimination of parasites.

When to use: Intestinal parasite infestations, especially tapeworm, where the worms need to be both killed and expelled from the body.

Jin Yin Hua
Jin Yin Hua 1:1 (typically 9-15g each)

Guàn Zhòng and Jīn Yín Huā both clear Heat-toxins but through different mechanisms: Guàn Zhòng cools Blood-level Heat and has antiviral properties, while Jīn Yín Huā excels at dispersing Wind-Heat from the exterior. Together they provide broad-spectrum protection against epidemic febrile diseases.

When to use: Prevention and early-stage treatment of epidemic warm diseases such as influenza, when there are symptoms of fever, sore throat, and skin eruptions.

Wu Ling Zhi
Wu Ling Zhi 1:1 (both charred, ground to powder)

Guàn Zhòng cools Blood and stops bleeding, while Wǔ Líng Zhī invigorates Blood and resolves stasis. Together they stop uterine bleeding while simultaneously addressing blood stasis, preventing the formation of clots that can perpetuate the bleeding cycle.

When to use: Uterine flooding and spotting (崩漏) with dark, clotted menstrual blood, abdominal pain, and a deep pulse, indicating both Blood Heat and Blood stasis.

Comparable Ingredients

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

He Shi
Guan Zhong vs He Shi

Both Guàn Zhòng and Hè Shī (Carpesium fruit) kill intestinal parasites, but Guàn Zhòng is especially effective against tapeworms and also clears Heat-toxins and stops bleeding, giving it a much broader range of uses beyond parasite treatment. Hè Shī is milder and more focused purely on parasite expulsion.

Ban Lan Gen
Guan Zhong vs Ban Lan Gen

Both herbs clear Heat-toxins and are used to prevent and treat epidemic infectious diseases. However, Bǎn Lán Gēn (Isatis root) is primarily a Heat-clearing herb with no antiparasitic or hemostatic actions, while Guàn Zhòng uniquely combines antiviral, antiparasitic, and hemostatic properties. Bǎn Lán Gēn is preferred when the focus is purely on clearing throat Heat and epidemic toxins.

Da Qing Ye
Guan Zhong vs Da Qing Ye

Both clear Heat-toxins and cool Blood, and both are used for warm-disease rashes and epidemic febrile illness. However, Dà Qīng Yè is stronger at cooling the Blood level and clearing Heart and Stomach Fire, while Guàn Zhòng uniquely adds antiparasitic and hemostatic actions. Dà Qīng Yè is preferred when the condition has clearly entered the Blood level with high fever and maculopapular rashes.

Identity & Adulterants

Related species and common adulterations to be aware of when sourcing Guan Zhong

Guan Zhong has one of the most complex substitution problems in Chinese herbal medicine. Over 50 different fern species from 11 families have historically been sold under the name "Guan Zhong" in different regions. The Chinese Pharmacopoeia currently recognizes only two official species: Mian Ma Guan Zhong (绵马贯众, Dryopteris crassirhizoma) and Zi Qi Guan Zhong (紫萁贯众, Osmunda japonica). Common adulterants include the rhizomes of Woodwardia japonica (狗脊贯众), Cyrtomium fortunei (贯众 from the Cyrtomium genus), and various other fern species. These substitutes have different chemical compositions, different levels of efficacy, and different toxicity profiles. DNA barcoding and thin-layer chromatography (testing for the characteristic filicic acid compounds) are modern methods used to authenticate the genuine Dryopteris species. Visually, authentic Mian Ma Guan Zhong has a distinctive pattern of yellowish-white vascular bundles arranged in a ring on the cross-section, dense brown scales on the leaf stalk bases, and a characteristic odor.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Guan Zhong

Slightly toxic

The main toxic components are phloroglucinol derivatives, particularly filicin (粗绵马精), filicic acids, flavaspidic acids, and dryocrassin. These compounds are poorly absorbed from the gastrointestinal tract under normal conditions, but dietary fat greatly increases their absorption, which is why greasy foods must be avoided during use. In overdose, these compounds can paralyze voluntary muscles (including the heart muscle), irritate the GI tract causing nausea, vomiting, and diarrhea, and cause visual disturbances including yellow vision (xanthopsia) or even transient or permanent blindness due to retinal vasospasm and optic nerve damage. Severe toxicity can progress to tremors, seizures, delirium, coma, jaundice, kidney damage, and respiratory failure. The active phloroglucinol compounds are also chemically unstable and break down over time, so herb material stored for more than one year may lose both efficacy and predictable toxicity profile. At standard therapeutic doses (4.5-9g in decoction), toxicity risk is low because intestinal absorption is limited. Safety depends on strict dosage control and avoiding concurrent intake of fatty foods or oils.

Contraindications

Situations where Guan Zhong should not be used or requires extra caution

Avoid

Pregnancy. Guan Zhong has demonstrated uterine-stimulating effects in pharmacological studies, exciting the uterus and increasing contractions. It has anti-early-pregnancy and abortifacient properties. Pregnant women should avoid this herb entirely.

Avoid

Active gastrointestinal ulcers or significant GI bleeding. The toxic phloroglucinol compounds in Guan Zhong are irritating to the gastrointestinal mucosa and can worsen existing ulceration.

Avoid

Severe liver disease or hepatic impairment. The liver metabolizes the toxic filicin-type compounds; impaired liver function increases the risk of toxic accumulation, potentially causing jaundice and further liver damage.

Caution

Yin deficiency with internal Heat (阴虚内热). The herb's bitter, cold nature can further damage Yin fluids in someone already Yin-deficient, and its toxicity is less well-tolerated in depleted constitutions.

Caution

Spleen and Stomach deficiency-cold (脾胃虚寒). The herb's cold nature can damage the Spleen and Stomach Yang, worsening digestive weakness, loose stools, and cold abdominal pain.

Caution

Debilitated or constitutionally weak patients. Classical sources explicitly prohibit use in weak individuals, as they are more susceptible to the herb's toxic effects.

Avoid

Known allergy or hypersensitivity to Guan Zhong or fern-derived preparations.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Contraindicated in pregnancy. Pharmacological studies have demonstrated that Guan Zhong preparations can strongly excite uterine smooth muscle, increasing contraction frequency and tone. The herb has documented anti-early-pregnancy and abortifacient effects. Classical sources also warn against use in pregnancy; the Yunnan Materia Medica (《云南中草药》) states it is forbidden for pregnant women. Additionally, the herb's inherent toxicity (phloroglucinol compounds) poses a risk to fetal development. There are no circumstances under which this herb should be used during pregnancy without extremely careful specialist supervision.

Breastfeeding

Not recommended during breastfeeding. Guan Zhong contains toxic phloroglucinol compounds (filicic acids, dryocrassin) whose transfer into breast milk has not been studied, but given the herb's recognized toxicity and the vulnerability of nursing infants, use should be avoided. Additionally, the herb has estrogenic-like activity that could theoretically affect lactation. If antiparasitic or heat-clearing treatment is needed, safer alternatives should be chosen.

Children

Use with great caution in children. Classical sources explicitly list children among those for whom the herb is contraindicated or should be used only under strict supervision. Children have lower body weight, immature liver and kidney function, and are more susceptible to the toxic effects of the phloroglucinol compounds. If used at all, dosage must be significantly reduced proportional to age and weight. External use (such as a decoction wash for pinworm) is generally safer than oral administration for pediatric patients. Avoid use in infants entirely.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Guan Zhong

Fat-soluble medications and lipid-rich preparations: The toxic phloroglucinol compounds in Guan Zhong are poorly absorbed in the normal intestinal environment but are significantly more absorbable in the presence of fats and oils. Co-administration with lipid-based drug formulations or fat-soluble vitamins could theoretically increase absorption of the toxic components.

Castor oil and other oil-based laxatives: Oil-based purgatives were historically used after administering antiparasitic herbs to expel worms. With Guan Zhong, oil-based purgatives are specifically contraindicated because they promote absorption of the toxic filicin compounds through the intestinal wall, greatly increasing the risk of systemic toxicity.

Anticoagulant and antiplatelet drugs: Guan Zhong has Blood-cooling and hemostatic properties, and its phloroglucinol compounds have been shown to have antiplatelet effects in some studies. Combined use with anticoagulants (warfarin, heparin) or antiplatelet drugs (aspirin, clopidogrel) may produce unpredictable effects on bleeding and clotting.

Hepatotoxic drugs: Because Guan Zhong has inherent hepatotoxic potential at higher doses, co-administration with other hepatotoxic medications (e.g. acetaminophen at high doses, certain statins, methotrexate) should be avoided to prevent additive liver damage.

Dietary Advice

Foods and dietary considerations when taking Guan Zhong

Avoid greasy, oily, and fatty foods while taking Guan Zhong. Dietary fat promotes intestinal absorption of the herb's toxic phloroglucinol compounds (filicin, filicic acids), significantly increasing the risk of systemic toxicity. This includes fried foods, fatty meats, heavy oils, and rich dairy products. Also avoid alcohol, which can increase GI irritation and compound the herb's hepatotoxic potential. Cold, raw foods should be avoided if the herb is being used alongside Spleen-supporting therapies, as Guan Zhong's cold nature can already strain digestive function.

Botanical Description

Physical characteristics and morphology of the Guan Zhong source plant

Dryopteris crassirhizoma Nakai (commonly called thick-rhizome wood fern, male fern, or shield fern) is a large perennial fern of the Dryopteridaceae family. It grows 60–100 cm tall with a stout, erect rhizome densely covered in brown, lance-shaped scales. The fronds emerge in a vase-like cluster from the crown of the rhizome, each frond twice-pinnately divided (bipinnate to bipinnatifid), with the individual leaflets (pinnae) resembling small feathers or chicken wings, which gave rise to the folk name "wild chicken wing" (野鸡膀子). The leaflets are green on top, paler beneath, and bear round clusters of spore cases (sori) on the underside of the upper portions, each covered by a kidney-shaped or horseshoe-shaped indusium.

The plant favors shady, moist habitats such as forest understories, mountain valleys, and swampy woodland areas. It is a shade-loving species that thrives in cool, humid climates with rich soil. The medicinal part is the dried rhizome together with the remaining leaf stalk bases, which when harvested appears as a dense, irregularly shaped mass covered in the dark, scaly stumps of old leaf stalks.

Sourcing & Harvesting

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

Harvesting season

Autumn (primarily), or spring and autumn. The rhizomes are dug up, the leaf stalks and fibrous roots are trimmed off, soil is removed, and the material is sun-dried.

Primary growing regions

The primary and highest-quality producing regions are in northeast China, specifically Heilongjiang, Jilin, and Liaoning provinces, as well as parts of Inner Mongolia and northeastern Hebei. These cold, forested mountain areas with moist, shady environments produce the best-quality rhizomes with the highest active compound content. The northeast region is considered the dao di (道地) production area for Mian Ma Guan Zhong (绵马贯众). The related species used as Guan Zhong substitutes are found more widely across China, including Hebei, Henan, and Shaanxi for Osmunda japonica, and broader southern regions for Cyrtomium fortunei.

Quality indicators

Good quality Guan Zhong (Mian Ma Guan Zhong) rhizome pieces have a yellowish-brown to black-brown outer skin, with the cross-section showing a light brown to reddish-brown color and clearly visible yellowish-white vascular bundle dots arranged in a ring pattern. The aroma should be distinctive and characteristic. The taste is initially bland and slightly astringent, then gradually becomes bitter and slightly pungent. Pieces should be firm, not excessively fibrous or crumbly. Avoid material that is moldy, insect-damaged, or overly dried-out, and discard any that has been stored for more than one year, as the key active phloroglucinol compounds are chemically unstable and degrade over time.

Classical Texts

Key passages from the classical Chinese medical texts that describe Guan Zhong and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Original: "主腹中邪热气，诸毒，杀三虫。"

Translation: "It governs pathogenic Heat in the abdomen, various toxins, and kills the three types of intestinal parasites."

Ben Cao Gang Mu (《本草纲目》, Li Shizhen)

Original: "治下血崩中带下，产后血气胀痛，斑疹毒，漆毒，骨哽。"

Translation: "It treats uterine bleeding, metrorrhagia, vaginal discharge, postpartum pain and distension from Blood and Qi, toxic rashes, lacquer poisoning, and bone or fish-bone lodged in the throat."

Shen Nong Ben Cao Jing, on the name etymology

Original: "此草叶似凤尾，其根一本而众枝贯之，故草名凤尾草，根名贯众。"

Translation: "This plant's leaves resemble a phoenix tail, and its root is a single body through which many branches run. Hence the leaves are called 'phoenix tail grass' and the root is called Guan Zhong ('threading through many')."

Ben Cao Jing Shu (《本草经疏》)

Original: "病人虚寒无实热者禁用。"

Translation: "It is prohibited for patients with deficiency-cold and no substantial Heat."

Historical Context

The history and evolution of Guan Zhong's use in Chinese medicine over the centuries

Guan Zhong has been recorded since the earliest Chinese materia medica, the Shen Nong Ben Cao Jing, where it was classified for clearing abdominal pathogenic Heat and killing parasites. The name Guan Zhong (贯众) literally means "threading through the multitude," referring to the way many leaf stalk bases radiate from a single central rhizome. An alternative folk etymology preserved in a popular legend tells of a selfless farmhand who discovered the herb's deworming ability and shared it freely with his community. A village scholar honored this generosity by naming the herb "Guan Zhong" (贯众), meaning "sharing through to all people."

Throughout Chinese medical history, Guan Zhong was valued not only for treating individual patients but as a public health measure. It was a common folk practice to place a piece of Guan Zhong rhizome in the household drinking water cistern during epidemic seasons, believing that daily consumption of this water would help prevent infectious diseases. This practice was noted in multiple classical texts and remained widespread through the modern era. Li Shizhen expanded the herb's recorded uses in the Ben Cao Gang Mu to include stopping various types of bleeding, treating toxic rashes, and dissolving fish bones stuck in the throat. Notably, Guan Zhong is one of the main ingredients of the modern formula Lianhua Qingwen (连花清瘟), widely used in China for influenza and respiratory infections, connecting its ancient anti-epidemic reputation to contemporary clinical practice.

The identity of "Guan Zhong" has been complex throughout history, with over 50 different fern species from 11 families used under this name in various regions of China. The modern Chinese Pharmacopoeia has standardized the name to refer primarily to Dryopteris crassirhizoma (绵马贯众) and Osmunda japonica (紫萁贯众).

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Guan Zhong

1

Comprehensive review of D. crassirhizoma botany, phytochemistry, pharmacology, and toxicology (2024)

Bai QX, Zhang ZJ, Tang HP, Yang BY, Kuang HX, Wang M. Journal of Ethnopharmacology, 2024, 328:118109.

This review paper systematically summarized the traditional uses, chemical composition (phloroglucinols, flavonoids, terpenoids, steroids, and other compounds), and wide-ranging pharmacological activities of D. crassirhizoma, including antiviral, anti-inflammatory, anticancer, and anthelmintic effects. The review also analyzed its toxicology and pharmacokinetics, noting the need for further research on extraction methods for active ingredients.

2

Anti-influenza virus (H5N1) activity screening of phloroglucinols from D. crassirhizoma (2017, in vitro)

Wang J, Yan YT, Fu SZ, Peng B, Bao LL, Zhang YL, Hu JH, Zeng ZP, Geng DH, Gao ZP. Molecules, 2017, 22(3):431.

Researchers screened phloroglucinol compounds from D. crassirhizoma rhizomes for neuraminidase (NA) inhibitory activity against H5N1 influenza virus. Dryocrassin ABBA and filixic acid ABA showed strong NA inhibition. Dryocrassin ABBA also demonstrated inhibitory activity against H5N1 virus in cell culture with low cytotoxicity, suggesting potential as an anti-influenza agent.

3

Anticoronaviral activity of phloroglucinols from D. crassirhizoma targeting SARS-CoV-2 main protease (2022, in vitro)

Jin YH, Jeon S, Lee J, Kim S, Jang MS, Park CM, Song JH, Kim HR, Kwon S. Pharmaceutics, 2022, 14(2):376.

Building on earlier influenza research, this study found that dryocrassin ABBA and filixic acid ABA from D. crassirhizoma inhibited the main protease (3CL) of SARS-CoV-2 in a dose-dependent manner. Both compounds also showed inhibitory activity against SARS-CoV and MERS-CoV infection in cell-based assays, suggesting broad-spectrum anticoronaviral potential.

4

Anti-inflammatory activity of D. crassirhizoma ethanol extract targeting ERK1 and TBK1 pathways (2013, in vitro/in vivo)

Cho YC, Park JA, Kim TH, et al. Journal of Ethnopharmacology, 2013, 145(1):205-213.

An ethanol extract of D. crassirhizoma showed strong anti-inflammatory activity in macrophage cell lines and in an HCl/ethanol-induced gastritis mouse model. The extract suppressed inflammatory mediator production through inhibition of the ERK/AP-1 and TBK1/IRF3 signaling pathways, providing a pharmacological basis for its traditional use against inflammatory and infectious conditions.

PubMed
5

Antioxidant and immunomodulatory activities of D. crassirhizoma polysaccharides (2019, in vitro)

Wang J, Luo J, Li Z, et al. International Journal of Biological Macromolecules, 2019, 132:1129-1137.

An acidic polysaccharide fraction (DCP-3) purified from D. crassirhizoma rhizome demonstrated notable antioxidant capacity in multiple assays and stimulated macrophage activity including nitric oxide and cytokine production, indicating immunomodulatory potential that may contribute to the herb's traditional use for preventing epidemic diseases.

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.