Herb Root (根 gēn)

Liang Mian Zhen

Shiny-leaved Prickly Ash Root · 两面针

Zanthoxylum nitidum (Roxb.) DC. · Radix Zanthoxyli Nitidi

Also known as: Ru Di Jin Niu (入地金牛), Shuang Mian Zhen (双面针)

Liang Mian Zhen (Shiny-leaved Prickly Ash Root) plant

Images shown are for educational purposes only

Liang Mian Zhen is a traditional Chinese herb used mainly for pain relief, especially toothache, stomach pain, and joint pain from wind-dampness. It promotes blood circulation and unblocks the body's channels, making it helpful for traumatic injuries and rheumatic conditions. It has mild toxicity and should not be taken in excess or combined with sour foods.

Category Blood-invigorating and stasis-dispelling herbs (活血化瘀药) Wind-Damp dispelling herbs (祛风湿药)
Therapeutic focus Pain Management Joint and Muscle Health Digestive Health Oral and Dental Health

TCM Properties

Temperature

Neutral

Taste

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

Channels entered

Liver, Stomach

Parts used

Root (根 gēn)

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 Liang Mian Zhen does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Liang Mian Zhen is primarily used to support these areas of health:

Pain Management Joint and Muscle Health Digestive Health Oral and Dental Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Liang Mian Zhen performs to restore balance in the body:

Invigorates Blood and Dispels Stasis Moves Qi and Alleviates Pain Dispels Wind-Dampness and Unblocks the Collaterals Resolves Toxicity and Reduces Swelling

How these actions work

'Invigorates Blood and resolves stasis' means this herb actively promotes blood circulation and helps break up areas where blood has pooled or stagnated. This is why it is used for traumatic injuries such as sprains, bruises, and falls where swelling and pain are caused by trapped blood in the tissues.

'Moves Qi and stops pain' refers to this herb's ability to relieve pain by promoting the smooth flow of Qi. When Qi becomes stuck, pain follows. This action makes Liang Mian Zhen especially useful for stomach pain, abdominal pain, and toothache where the underlying cause involves Qi stagnation. Its acrid and bitter tastes contribute to this dispersing, descending action.

'Dispels Wind and unblocks the collaterals' means the herb can address pain and stiffness in the joints and muscles caused by Wind-Dampness lodging in the body's smaller pathways (collaterals). This is the reason it is used for rheumatic joint pain, numbness, and limited movement.

'Resolves toxins and reduces swelling' refers to its ability to counteract certain toxic conditions, including venomous snakebites, sore throat, and skin abscesses. Used externally, it also treats burns and scalds.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Liang Mian Zhen is used to help correct these specific patterns.

Why Liang Mian Zhen addresses this pattern

Liang Mian Zhen directly addresses Blood Stasis through its acrid and bitter tastes, which disperse and move stagnant Blood. Its affinity for the Liver channel (the organ that stores Blood and ensures its smooth flow) makes it especially effective at breaking up Blood stasis that manifests as fixed, stabbing pain from traumatic injuries. The herb's Blood-invigorating action helps restore normal circulation to damaged tissues, reducing swelling and bruising.

A practitioner would look for one or more of these signs

Bruising

Purple bruising from trauma

Swelling

Localized swelling at injury site

Sharp And Fixed Pain

Fixed, stabbing pain that worsens with pressure

Commonly Used For

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

Arises from: Qi Stagnation

TCM Interpretation

In TCM, toothache is most commonly related to the Stomach channel, which runs through the upper and lower jaw. Pain can arise from Stomach Fire flaring upward along the channel, from Wind-Heat invading the collaterals of the teeth, or from Qi and Blood stagnation in the local area. In many cases, especially in dental caries or chronic tooth pain, local stagnation of Qi and Blood in the gum tissues is a contributing factor.

Why Liang Mian Zhen Helps

Liang Mian Zhen enters the Stomach channel directly and has strong Qi-moving and Blood-invigorating properties that address local stagnation in the gums and jaw. Its acrid taste disperses stagnation, while its alkaloid content provides a local numbing and analgesic effect on the oral tissues. It can be taken internally as a decoction or used as a mouth rinse. Topically, the powdered root can be placed directly on the painful tooth. This herb is so closely associated with oral health that it is the namesake ingredient of one of China's best-known herbal toothpaste brands.

Also commonly used for

Bruising

Traumatic injuries with swelling and bruising

Lower Back Pain

Lumbar pain from strain or wind-dampness

Neuralgia

Intercostal neuralgia and sciatica

Sore Throat

Acute throat pain and tonsillar abscess

Burns And Scalds

Applied externally as powder for burns

Snake Bite

Venomous snakebite, taken internally and applied externally

Herb Properties

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

Temperature

Neutral

Taste

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

Channels Entered

Liver Stomach

Parts Used

Root (根 gēn)

Dosage & Preparation

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

Standard dosage

5-10g

Maximum dosage

Do not exceed 10g in decoction. This is a slightly toxic herb and overdose can cause serious gastrointestinal distress, cardiac effects, and potentially dangerous adverse reactions.

Dosage notes

The standard dosage of 5 to 10 grams is used for internal decoction to treat pain conditions such as toothache, stomach pain, and rheumatic joint pain. For external use, there is no strict gram limit: the powdered herb is mixed with a suitable vehicle and applied to the affected area, or a decoction is used as a wash for burns, scalds, or skin conditions. For toothache, a small amount of powdered root bark can be applied directly to the cavity, or 3 to 9 grams can be decocted and used as a mouth rinse. Because this herb is slightly toxic, it is important not to exceed the recommended dose. Avoid concurrent consumption with sour or acidic foods, which is a specific classical caution for this herb.

Preparation

No special decoction handling is required. The dried root slices or segments are decocted normally with water. For external use, the herb can be ground to powder and mixed with a vehicle for topical application, or decocted and used as a wash.

Processing Methods

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

Processing method

Root slices are stir-fried with rice wine (huangjiu) until the wine is fully absorbed and the slices are dry.

How it changes properties

Wine processing enhances the Blood-invigorating and collateral-unblocking actions of the herb. The warmth of wine helps guide the herb's therapeutic effects into the channels and collaterals more effectively, strengthening its ability to dispel Wind-Dampness. The overall thermal nature shifts slightly warmer.

When to use this form

Preferred for rheumatic joint pain and traumatic injuries where Blood stasis and channel obstruction are prominent. The wine-processed form enhances pain relief for musculoskeletal conditions.

Common Herb Pairs

These ingredients are traditionally combined with Liang Mian Zhen for enhanced therapeutic effect

Ji
Jiu Li Xiang Varies by preparation; in San Jiu Wei Tai, both are used in similar proportions

When Liang Mian Zhen is paired with Jiu Li Xiang (九里香, Common jasmine orange), both herbs move Qi and stop pain, but they complement each other in important ways. Jiu Li Xiang has local anesthetic properties and excels at dispersing Qi stagnation, while Liang Mian Zhen adds stronger Blood-invigorating action. Together they provide both Qi-level and Blood-level pain relief, and when used as injection preparations, Jiu Li Xiang's longer induction time is offset by Liang Mian Zhen's rapid onset.

When to use: Stomach pain, toothache, and for local anesthesia in minor surgical procedures. This pair forms a core component of San Jiu Wei Tai Granules for chronic gastritis.

Xu Chang Qing
Xu Chang Qing 1:1 (both 10-15g)

Both herbs are strong analgesics with Wind-dispelling actions. Xu Chang Qing (徐长卿) excels at relieving Wind-related pain and itching, while Liang Mian Zhen contributes stronger Blood-invigorating and collateral-unblocking effects. Together they provide comprehensive pain relief for rheumatic conditions that involve both Wind obstruction and Blood stasis.

When to use: Wind-Dampness Bi Syndrome with significant pain, especially in chronic cases with both Wind symptoms (wandering pain) and Blood stasis signs (fixed pain, dark tongue).

Mu Xiang
Mu Xiang Liang Mian Zhen 10g : Mu Xiang 6-9g

Mu Xiang (木香) is a premier Qi-moving herb for the middle burner, while Liang Mian Zhen adds Blood-invigorating action to the Qi-regulating effect. Together they address both Qi stagnation and Blood stasis in the Stomach, providing more complete relief for epigastric pain than either herb alone.

When to use: Chronic gastric pain with both distending (Qi stagnation) and fixed/stabbing (Blood stasis) characteristics, as seen in chronic gastritis.

Comparable Ingredients

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

Xu Chang Qing
Liang Mian Zhen vs Xu Chang Qing

Both are strong analgesic herbs used for rheumatic pain, toothache, and snakebite. Xu Chang Qing (徐长卿) is warm, non-toxic, and particularly strong at dispelling Wind and stopping itching, making it better for pain with skin symptoms or allergic conditions. Liang Mian Zhen is neutral with mild toxicity, and has stronger Blood-invigorating and collateral-unblocking actions, making it preferable when Blood stasis is prominent (traumatic injuries, fixed stabbing pain). Liang Mian Zhen also has notable local anesthetic properties.

Yan Hu Suo
Liang Mian Zhen vs Yan Hu Suo

Both are classified as Blood-invigorating pain-relieving herbs. Yan Hu Suo (延胡索) is warm and enters the Heart, Liver, and Spleen channels, excelling at moving Qi and Blood for a wide range of pain conditions throughout the body, particularly menstrual pain and chest pain. Liang Mian Zhen is neutral and enters the Liver and Stomach channels, with additional Wind-dispelling and toxin-resolving actions that make it more suitable for toothache, rheumatic joint pain, and snakebite. Yan Hu Suo is milder and non-toxic, making it safer for long-term or higher-dose use.

Chuan Xiong
Liang Mian Zhen vs Chuan Xiong

Both invigorate Blood and relieve pain. Chuan Xiong (川芎) is warm and rising in nature, primarily used for headache, menstrual pain, and as a 'Blood-level Wind herb' that guides other herbs upward. Liang Mian Zhen has a broader application for localized pain (toothache, joint pain, traumatic injury) and adds Wind-Dampness dispelling and toxin-resolving actions that Chuan Xiong lacks. Chuan Xiong is used far more widely in classical formulas, while Liang Mian Zhen is primarily used in folk and patent medicine traditions of southern China.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Liang Mian Zhen

Liang Mian Zhen (Zanthoxylum nitidum) may be confused with or substituted by two related Rutaceae species. Fei Long Zhang Xue (飞龙掌血, Toddalia asiatica) has a similar appearance but its root surface is blackish-brown with much smaller, whitish lenticels arranged in vertical lines, and its cross-section lacks the distinctive bright yellow colour. Zhu Ye Hua Jiao (竹叶花椒, Zanthoxylum armatum) is another common adulterant whose root surface is greyish-brown to dark brown with coarser, more prominent lenticels arranged longitudinally. Its prickles point upward rather than curving downward as in Z. nitidum. The authentic herb is best identified by its bright yellow inner bark, strongly acrid and tongue-numbing taste, and the distinctive concentric ring pattern visible on the cross-section.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Liang Mian Zhen

Slightly toxic

Liang Mian Zhen contains benzophenanthridine alkaloids, principally nitidine chloride (氯化两面针碱), chelerythrine, sanguinarine, and oxynitidine. These alkaloids are responsible for both the therapeutic effects and potential toxicity. Overdose symptoms include nausea, vomiting, abdominal pain, and diarrhea. More severe reactions may include elevated blood pressure, skin redness, itching, dizziness, and restlessness. There are documented cases of ingestion of fresh stems and leaves causing sudden cardiac and respiratory arrest leading to death. Animal studies have also shown that nitidine chloride can induce dose-dependent cardiac hypertrophy and cardiac dysfunction at high doses. Treatment for overdose involves induced emesis or catharsis, administration of sugar water, and intravenous glucose infusion. The Chinese Pharmacopoeia classifies this herb as having "slight toxicity" (有小毒) and specifies that the nitidine chloride content in the dried root must not be less than 0.25%. The herb is considered safe within the standard dosage range of 5 to 10 grams when properly dried and processed.

Contraindications

Situations where Liang Mian Zhen should not be used or requires extra caution

Avoid

Pregnancy. Liang Mian Zhen strongly invigorates Blood and moves Qi, which can stimulate the uterus and potentially cause miscarriage.

Avoid

Overdosage. This herb is classified as slightly toxic and must not exceed recommended doses. Overdose can cause nausea, vomiting, abdominal pain, diarrhea, and in severe cases elevated blood pressure, dizziness, or cardiac disturbance.

Caution

Consumption with sour or acidic foods. Classical sources specifically state this herb should not be taken together with acidic foods, as this may increase adverse reactions or alter its effects.

Caution

Yin deficiency with Heat. Because the herb is acrid and Blood-moving, those with underlying Yin deficiency and internal Heat (Fire from Yin deficiency) should use it cautiously to avoid worsening their condition.

Caution

Bleeding disorders or concurrent use of anticoagulant therapy. As a Blood-invigorating herb, it may potentiate bleeding risk in those with clotting disorders or on blood-thinning medications.

Caution

Patients with pre-existing cardiac conditions. Animal studies have shown that nitidine chloride, a major alkaloid in this herb, can induce cardiac hypertrophy at high doses, suggesting caution in those with heart disease.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Contraindicated in pregnancy. Liang Mian Zhen is a Blood-invigorating and Qi-moving herb classified as slightly toxic. Its active alkaloids (particularly nitidine chloride) have demonstrated significant biological activity that could stimulate uterine contractions and endanger the fetus. Classical and modern Chinese sources explicitly state that pregnant women should not take this herb (孕妇忌服). The root also has emmenagogue properties according to traditional use records across Asia.

Breastfeeding

Not recommended during breastfeeding. Liang Mian Zhen is classified as slightly toxic and contains bioactive alkaloids (nitidine chloride, chelerythrine, sanguinarine) that may transfer into breast milk. No safety data exists for use during lactation. Given the known toxicity profile, including potential cardiac effects at higher doses, the herb should be avoided by nursing mothers as a precautionary measure.

Children

Generally not recommended for children due to the herb's slight toxicity and potent bioactive alkaloid content. If used under the guidance of an experienced practitioner for older children, doses should be significantly reduced (typically one-third to one-half of the adult dose). This herb should not be given to infants or young children. The strong acrid and numbing taste may also cause difficulty with compliance.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Liang Mian Zhen

Anticoagulant and antiplatelet medications: Liang Mian Zhen invigorates Blood and has demonstrated effects on blood clotting in animal studies. Concurrent use with warfarin, heparin, aspirin, or clopidogrel may increase bleeding risk.

Cardiac medications: Animal studies have shown that nitidine chloride can increase heart rate, cardiac output, and may induce cardiac hypertrophy. Caution is advised when combining this herb with cardiac glycosides (e.g. digoxin), antiarrhythmics, or beta-blockers.

Sedative and CNS-depressant drugs: The herb has demonstrated sedative and antispasmodic properties in pharmacological studies. Combining it with benzodiazepines, barbiturates, or other CNS depressants could potentially enhance sedation.

Hepatically metabolized drugs: Some alkaloids in Liang Mian Zhen may affect cytochrome P450 enzyme activity. Patients taking medications with a narrow therapeutic index that are liver-metabolized should exercise caution.

Dietary Advice

Foods and dietary considerations when taking Liang Mian Zhen

Avoid sour and acidic foods while taking Liang Mian Zhen. This is a specific classical caution (忌与酸味食物同服) documented in the Chinese Pharmacopoeia and traditional sources. Examples include vinegar, citrus fruits, pickled vegetables, and fermented sour foods. Cold, raw foods are best minimized as well, as the herb is used to move Qi and Blood, and cold foods can counteract its warming, circulating actions.

Botanical Description

Physical characteristics and morphology of the Liang Mian Zhen source plant

Zanthoxylum nitidum (Roxb.) DC. is an evergreen woody climber (liana) in the Rutaceae (citrus) family. When young it grows as an upright shrub, but as it matures it scrambles and climbs over other vegetation, reaching heights of up to 5 meters. The plant is distinguished by characteristic hooked prickles on its stems, branches, leaf axes, and notably on both sides of the leaflet midvein, which gives the herb its Chinese name "Liang Mian Zhen" (两面针, literally "needles on both sides"). The prickles are dark purplish-red and curve slightly downward, measuring 1 to 2.5 mm long.

The leaves are odd-pinnately compound, 7 to 15 cm long, with 3 to 11 opposite, leathery, ovate to oblong leaflets that are glossy on the upper surface. Flowers are small, four-petalled, pale yellowish-green, and arranged in axillary panicle-like clusters, blooming from March to May. The fruits are small follicles that ripen to purplish-red from September to November, containing round, glossy black seeds. The main root is thick and robust with many branch roots; the outer root bark is muddy yellow while the inner bark is a distinctive sulphur yellow colour, soft in texture, with a faintly aromatic smell and an intensely acrid, tongue-numbing, bitter taste.

Sourcing & Harvesting

Where Liang Mian Zhen is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Can be harvested year-round (全年均可采挖); roots are dug up, washed, cut into slices or segments, and sun-dried.

Primary growing regions

The primary producing regions are in southern China, especially Guangxi, Guangdong, and Fujian provinces, which are the main commercial sources. It is also found in Yunnan, Guizhou, Taiwan, and Zhejiang. Guangxi is generally regarded as the most important production area, where wild resources are abundant and the famous "Liang Mian Zhen" toothpaste brand originated. The plant grows in warm, humid areas below 800 metres elevation, commonly in open forests, shrubby hillsides, and along mountain slopes. It also occurs across tropical and subtropical Asia including India, Myanmar, Thailand, Vietnam, Malaysia, the Philippines, and into northern Australia.

Quality indicators

Good quality Liang Mian Zhen root is hard and dense, with a pale brownish-yellow to pale yellow outer surface bearing distinctive bright yellow or yellowish-brown rounded lenticel-like spots. The cross-section should be relatively smooth, showing a pale brown bark layer and pale yellow wood with visible concentric ring patterns and densely distributed small pores. The herb should have a faint aromatic smell and a strongly acrid, tongue-numbing, bitter taste when chewed. Traditionally, roots with thick bark and a strong, concentrated flavour are considered the best quality. The Chinese Pharmacopoeia requires that dried material contain no less than 0.25% nitidine chloride by weight. Avoid material that is soft, moldy, or lacking the characteristic pungent taste.

Classical Texts

Key passages from the classical Chinese medical texts that describe Liang Mian Zhen and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》) — under the name Man Jiao (蔓椒, the fruit of this species):
Original Chinese: 「蔓椒，味苦，温。主风寒湿痹，疬节疼，除四肢厥气，膝痛。一名家椒。生川谷及丘家间。」
Translation: "Man Jiao, bitter in flavour, warm in nature. Treats Wind-Cold-Damp obstruction, scrofulous joint pain, expels cold reversal Qi of the four limbs, and knee pain. Also called Jia Jiao. Grows in river valleys and among hills."

Ben Cao Qiu Yuan (《本草求原》, Qing Dynasty) — the earliest text to record the root under the name Ru Di Jin Niu (入地金牛):
This Qing Dynasty text first documented the medicinal use of the root of this plant, noting that fine-leaved varieties were of superior quality. It established the root, rather than the fruit, as the primary medicinal part used in southern Chinese folk medicine for pain relief and trauma.

Chinese Pharmacopoeia (《中华人民共和国药典》2015 edition):
Original Chinese: 「活血化瘀，行气止痛，祛风通络，解毒消肿。用于跌扑损伤，胃痛，牙痛，风湿痹痛，毒蛇咬伤；外治烧烫伤。」
Translation: "Invigorates Blood and transforms stasis, moves Qi and stops pain, dispels Wind and frees the channels, resolves toxins and reduces swelling. Used for traumatic injury, stomach pain, toothache, Wind-Damp painful obstruction, and venomous snake bite; externally for burns and scalds."

Historical Context

The history and evolution of Liang Mian Zhen's use in Chinese medicine over the centuries

The relationship between Liang Mian Zhen and the ancient herb "Man Jiao" (蔓椒) recorded in the Shen Nong Ben Cao Jing has been a source of scholarly debate for centuries. Recent textual research (2025) by scholars at the Guangxi University of Chinese Medicine and the China Academy of Chinese Medical Sciences has clarified that Man Jiao in the ancient classics actually refers to Zanthoxylum armatum (竹叶花椒), not Z. nitidum. The two are distinct species with different medicinal parts and properties. The root of Z. nitidum itself was first recorded under the name "Ru Di Jin Niu" (入地金牛, meaning "Golden Bull Entering the Earth") in the Qing Dynasty text Ben Cao Qiu Yuan (《本草求原》). The name "Liang Mian Zhen" (两面针) appeared later in the Ling Nan Cai Yao Lu (《岭南采药录》) and became the standard name, describing the distinctive hooked prickles found on both sides of the leaf midvein.

In modern times, Liang Mian Zhen has become one of China's best-known medicinal plants thanks to its commercial use in oral care. The "Liang Mian Zhen" toothpaste brand, launched in Guangxi, was the first Chinese toothpaste to promote the concept of "Chinese herbal tooth protection" and became a nationally recognized brand. The herb is also a key ingredient in the widely used patent medicine San Jiu Wei Tai (三九胃泰) for stomach disorders. The type specimen of Z. nitidum was collected from the outskirts of Guangzhou and introduced to the Calcutta Botanical Garden in 1812, where it was formally described by William Roxburgh. The species epithet "nitidum" means "shiny" or "glossy," referring to the lustrous appearance of its leaflets and seeds.

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Liang Mian Zhen

1

Comprehensive Review: Traditional uses, phytochemistry, pharmacological activities and toxicology of Z. nitidum (2020)

Lu Q, Ma R, Yang Y, Mo Z, Pu X, Li C. Journal of Ethnopharmacology, 2020, 260: 112946.

This systematic review covered 60 years of research on Liang Mian Zhen, summarizing its botanical characteristics, traditional uses, chemical constituents (over 100 compounds identified including alkaloids, coumarins, lignans, and flavonoids), and pharmacological activities (analgesic, anti-inflammatory, antimicrobial, antitumor, antiviral, and hepatoprotective). The review noted that many traditional uses have been validated by pharmacological studies, though clinical trials remain lacking.

PubMed
2

Preclinical study: Inhibition of STAT3 signaling by nitidine chloride suppresses gastric cancer growth and angiogenesis (2012)

Chen J, Wang J, Lin L, et al. Molecular Cancer Therapeutics, 2012, 11(2): 277-287.

This in vitro and in vivo study demonstrated that nitidine chloride, the major alkaloid from Liang Mian Zhen, inhibited gastric cancer cell growth and tumor angiogenesis through suppression of the JAK2/STAT3 signaling cascade. In mouse xenograft models, intraperitoneal injection at 7 mg/kg/day significantly suppressed tumor volume, weight, and microvessel density.

PubMed
3

Preclinical study: Nitidine chloride induces apoptosis in renal cancer via ERK pathway suppression (2014)

Pan X, Han H, Wang L, et al. Food and Chemical Toxicology, 2014, 66: 210-216.

This study showed that nitidine chloride suppressed the growth of renal cancer cell lines (786-O and A498) in a time- and dose-dependent manner and reduced tumor growth in nude mouse xenograft models. The mechanism involved decreased phosphorylation of ERK and Akt, with upregulation of P53, Bax, and caspase-3.

PubMed
4

Preclinical toxicology study: Nitidine chloride induces cardiac hypertrophy by targeting autophagy-related 4B cysteine peptidase (2022)

Hong Y, Xu WQ, Feng J, et al. Acta Pharmacologica Sinica, 2023, 44(4): 860-871.

This important safety study found that both aqueous extract of Z. nitidum and purified nitidine chloride induced dose-dependent cardiac hypertrophy and cardiac dysfunction in rodent models. High doses of nitidine chloride caused death in beagle dogs. The mechanism involved suppression of cardiac autophagy through targeting of ATG4B. This study highlights the importance of dose control with this herb.

PubMed
5

Review: Chemical components and pharmacological activities of Liang Mian Zhen (2021, Chinese)

Fu JL, Yang LM, Fan XY, Guo QR, Zhou WM, Zhang JY. Acta Pharmaceutica Sinica (药学学报), 2021, 56(8): 2169-2181.

A comprehensive Chinese-language review summarizing over 100 chemical compounds isolated from Liang Mian Zhen, with detailed discussion of the antitumor, anti-inflammatory, antimicrobial, and antioxidant activities of nitidine chloride and other benzophenanthridine alkaloids, as well as hepatotoxicity and nephrotoxicity concerns at higher doses.

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.