Herb Bark (皮 pí / 树皮 shù pí)

Wu Jia Pi

Slender Acanthopanax Root Bark · 五加皮

Acanthopanax gracilistylus W.W. Smith · Cortex Acanthopanacis

Also known as: Nan Wu Jia Pi (南五加皮)

Wu Jia Pi (Slender Acanthopanax Root Bark) plant

Images shown are for educational purposes only

Wu Jia Pi is a warming root bark used for over 2,000 years in Chinese medicine to relieve joint pain and stiffness caused by cold and damp conditions. It also strengthens the lower back and knees, supports healthy bones and tendons, and helps reduce swelling from fluid retention. It is often taken as a medicinal wine and is particularly well suited for elderly or physically weak individuals.

Category Wind-Damp dispelling herbs (祛风湿药) Wind-Damp dispelling herbs that strengthen sinews and bones (祛风湿强筋骨药)
Therapeutic focus Bone and Joint Health Bone and Tendon Health Lower Back and Knee Health Fluid Retention and Edema

TCM Properties

Temperature

Warm

Taste

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

Channels entered

Liver, Kidneys

Parts used

Bark (皮 pí / 树皮 shù pí)

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What This Herb Does

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

Therapeutic focus

In practical terms, Wu Jia Pi is primarily used to support these areas of health:

Bone and Joint Health Bone and Tendon Health Lower Back and Knee Health Fluid Retention and Edema

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Wu Jia Pi performs to restore balance in the body:

Dispels Wind-Dampness Nourishes Liver and Kidney Yin Strengthens the Sinews and Bones Promotes Urination and Reduces Edema

How these actions work

'Dispels Wind-Dampness' means Wu Jia Pi drives out pathogenic Wind, Cold, and Dampness from the joints, muscles, and channels. Its acrid taste disperses Wind, its bitter taste dries Dampness, and its warm nature expels Cold. This is why it is a go-to herb for joint pain, stiffness, and restricted movement caused by exposure to cold, damp conditions. It is considered a 'strengthening' type of Wind-Damp herb, making it especially suitable for elderly patients or those with chronic illness who cannot tolerate harsh, purely dispersing herbs.

'Tonifies the Liver and Kidneys' means Wu Jia Pi nourishes and warms the Liver and Kidney organ systems, which govern the sinews and bones respectively. When these organs are weak, a person may experience low back pain, weak knees, or delayed motor development in children. Wu Jia Pi's warm, supplementing nature gently bolsters these organs while simultaneously expelling pathogenic factors.

'Strengthens sinews and bones' follows directly from its Liver and Kidney tonification. Because the Liver rules the sinews and the Kidneys govern the bones, strengthening these organs translates into firmer tendons, ligaments, and skeletal structure. This action is used for conditions like soft or weak bones, difficulty walking, and chronic lower back weakness.

'Promotes urination and reduces edema' refers to Wu Jia Pi's ability to warm the Kidneys and move water, addressing fluid accumulation in the limbs and skin. It helps the body expel excess Dampness through the urinary tract, making it useful for swelling of the legs, feet, and body.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Wu Jia Pi is used to help correct these specific patterns.

Why Wu Jia Pi addresses this pattern

Wu Jia Pi is one of the most important herbs for Wind-Cold-Damp Bi (painful obstruction). Its acrid taste disperses Wind, its bitter taste dries Dampness, and its warm nature drives out Cold from the joints and channels. Unlike purely dispersing Wind-Damp herbs, Wu Jia Pi also tonifies the Liver and Kidneys, making it especially effective for Bi patterns in elderly patients or those with underlying deficiency. The herb targets the Liver and Kidney channels, which govern the sinews and bones most affected in this pattern.

A practitioner would look for one or more of these signs

Moving Pain

Aggravated by cold and damp weather

Muscle Stiffness

Especially in the lower limbs

Lower Back Pain

Cold, aching quality

Knee Pain

With difficulty bending and extending

Commonly Used For

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

Arises from: Wind-Cold

TCM Interpretation

TCM views rheumatoid arthritis primarily as a form of Bi syndrome (painful obstruction), where external pathogenic factors including Wind, Cold, and Dampness invade the channels and lodge in the joints. Over time, these pathogens obstruct the flow of Qi and Blood, causing pain, swelling, and stiffness. In chronic cases, the Liver and Kidneys become depleted because prolonged illness drains the body's foundational reserves. The joints then lack nourishment from the sinews (governed by the Liver) and bones (governed by the Kidneys), worsening deformity and weakness.

Why Wu Jia Pi Helps

Wu Jia Pi addresses both sides of this condition. Its warm, acrid nature actively drives out Wind, Cold, and Dampness from the joints, directly relieving the obstruction that causes pain and stiffness. At the same time, its Liver and Kidney tonifying properties replenish the organs that nourish the sinews and bones, addressing the underlying deficiency that allows the disease to persist. This dual action of expelling pathogens while supplementing deficiency makes it particularly suited for chronic arthritic conditions in patients who are elderly or weakened, where aggressive pathogen-dispelling herbs alone would be too depleting.

Also commonly used for

Osteoarthritis

Chronic joint degeneration with pain and weakness

Osteoporosis

Bone weakening in the elderly

Rickets

Childhood delayed walking and bone weakness

Sciatica

Lower back and leg pain

Gout

Joint swelling with dampness component

Impotence

Related to Kidney Yang deficiency

Herb Properties

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

Temperature

Warm

Taste

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

Channels Entered

Liver Kidneys

Parts Used

Bark (皮 pí / 树皮 shù pí)

Dosage & Preparation

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

Standard dosage

5-10g

Maximum dosage

Up to 15g in decoction for severe bi-obstruction pain, under practitioner supervision. When using fresh herb, double the standard dose. No serious toxicity concerns at standard doses for the genuine Nan Wu Jia Pi.

Dosage notes

Use lower doses (5-6g) when the primary goal is gentle supplementation of Liver and Kidney with mild wind-damp dispelling. Use higher doses (9-10g) for more active wind-damp bi-obstruction pain and oedema. Fresh herb may be used at double the dried dose. When taken as medicinal wine (Wu Jia Pi Jiu), the bark is typically steeped in wine at a ratio of approximately 100g herb to 1 litre of wine. Wine-processed Wu Jia Pi (酒制五加皮) has enhanced ability to move through the channels and strengthen the sinews.

Preparation

No special decoction handling required. Wu Jia Pi is decocted normally with other herbs. It may also be processed with wine (酒制) to enhance its channel-entering and sinew-strengthening properties. Most classically, it is prepared as a medicinal wine by soaking or simmering in alcohol.

Processing Methods

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

Processing method

The cleaned, cut Wu Jia Pi segments are mixed with yellow rice wine (Huang Jiu), allowed to absorb until the wine is fully soaked in, then taken out and dried. The standard ratio is 12 kg of wine per 100 kg of herb.

How it changes properties

Wine processing enhances the herb's ability to dispel Wind, scatter Cold, and eliminate Dampness. The wine acts as a guiding vehicle that increases the herb's penetration into the channels and joints. The thermal nature becomes slightly more warming, and the Blood-invigorating action is strengthened. The raw form is better at tonifying the Liver and Kidneys and strengthening bones; the wine-processed form shifts the emphasis toward stronger pathogen expulsion.

When to use this form

Use the wine-processed form when the primary concern is active Wind-Cold-Damp Bi pain with stiffness, cold joints, and restricted movement. The raw form is preferred when the focus is on tonifying deficiency, strengthening bones, reducing edema, or treating childhood delayed walking.

Common Herb Pairs

These ingredients are traditionally combined with Wu Jia Pi for enhanced therapeutic effect

Du Zhong
Du Zhong 1:1 (e.g. Wu Jia Pi 9g : Du Zhong 9g)

Both herbs tonify the Liver and Kidneys and strengthen the sinews and bones. Wu Jia Pi adds its Wind-Damp dispelling action, while Du Zhong is stronger at stabilizing the Kidneys and securing the lower back. Together they create a powerful synergy for the lumbar spine, both nourishing the underlying deficiency and clearing any pathogenic obstruction.

When to use: Chronic lower back pain from Liver-Kidney deficiency, especially when complicated by cold-damp invasion. Also for joint pain with underlying weakness.

Wei Ling Xian
Wei Ling Xian 1:1 (e.g. Wu Jia Pi 9g : Wei Ling Xian 9g)

Both herbs dispel Wind-Dampness, but through complementary mechanisms. Wu Jia Pi strengthens the sinews and bones while dispelling pathogens. Wei Ling Xian is more powerful at unblocking the channels and alleviating pain. Together, the pair strongly dispels Wind-Damp and relieves Bi pain while protecting the underlying structural integrity.

When to use: Wind-Damp Bi pain with stiffness and restricted movement, especially involving the lower limbs and lumbar region. Often combined with Du Huo for enhanced effect.

Sang Ji Sheng
Sang Ji Sheng 1:1 (e.g. Wu Jia Pi 9g : Sang Ji Sheng 9g)

Both herbs dispel Wind-Dampness while tonifying the Liver and Kidneys. Wu Jia Pi is warmer and stronger at driving out Cold-Damp pathogens while warming the Kidney Yang. Sang Ji Sheng is neutral and milder, better at nourishing Liver Blood and calming the sinews. Together they address both the Yang and Blood aspects of Liver-Kidney deficiency in chronic Bi conditions.

When to use: Chronic Bi syndrome with Liver-Kidney deficiency, especially when both low back soreness and joint pain have persisted for a long time.

Fu Ling Pi
Fu Ling Pi 1:1 (e.g. Wu Jia Pi 9g : Fu Ling Pi 9g)

Wu Jia Pi warms the Kidneys and promotes urination. Fu Ling Pi (Poria peel) blandly percolates Dampness and reduces edema. Together they combine Kidney-warming and Dampness-draining actions to effectively reduce fluid accumulation in the skin and limbs.

When to use: Edema with scanty urine, especially involving the lower limbs, as seen in the Wu Pi San variant.

Comparable Ingredients

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

Sang Ji Sheng
Wu Jia Pi vs Sang Ji Sheng

Both dispel Wind-Dampness and tonify the Liver and Kidneys. However, Wu Jia Pi is warm and acrid, primarily driving out Cold-Damp pathogens while warming Kidney Yang. Sang Ji Sheng is neutral in temperature and milder at expelling pathogens, but stronger at nourishing Liver Blood. Sang Ji Sheng also has the unique ability to calm the fetus during pregnancy, which Wu Jia Pi lacks. Choose Wu Jia Pi when Cold-Damp is prominent; choose Sang Ji Sheng when Blood deficiency is the main concern or during pregnancy.

Du Zhong
Wu Jia Pi vs Du Zhong

Both tonify the Liver and Kidneys and strengthen the lower back. Du Zhong is primarily a Kidney-tonifying herb with only mild Wind-Damp dispelling ability, and it also calms the fetus. Wu Jia Pi is primarily a Wind-Damp dispelling herb that also tonifies the Liver and Kidneys, and it additionally promotes urination to reduce edema. Choose Du Zhong when the main problem is pure Kidney deficiency with lower back weakness; choose Wu Jia Pi when Wind-Damp Bi pain is combined with deficiency.

Qiang Huo
Wu Jia Pi vs Qiang Huo

Both dispel Wind-Cold-Dampness from the body. Qiang Huo is strongly dispersing and focused on the upper body and Tai Yang channel, releasing the exterior and relieving headache and body aches from acute Wind-Cold invasion. Wu Jia Pi focuses on the lower body (Liver and Kidney channels), is gentler, and combines pathogen expulsion with Liver-Kidney tonification. Choose Qiang Huo for acute onset upper body pain; choose Wu Jia Pi for chronic lower body pain with underlying deficiency.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Wu Jia Pi

The most important and dangerous adulterant is Bei Wu Jia Pi (北五加皮), also called Xiang Jia Pi (香加皮), the root bark of Periploca sepium (Asclepiadaceae family). Despite sharing the commercial name "Wu Jia Pi" in some regions, it is an entirely different plant from a different botanical family and contains toxic cardiac glycosides. Key differences: Bei Wu Jia Pi has a strong, distinctive aromatic odour (hence the name "xiang" meaning fragrant), a pale yellowish cross-section with visible large oil cells, and a bitter taste with a prickling sensation. The genuine Nan Wu Jia Pi has only a subtle, mild fragrance and a greyish-white cross-section. Other occasional substitutes include root bark from various regional Acanthopanax species (such as Hong Mao Wu Jia / Red-hair Acanthopanax, and Qiao Mu Wu Jia), which are less potent but not toxic. Very rarely, Di Gu Pi (Lycium barbarum root bark, from the Solanaceae family) has been mistakenly substituted for Wu Jia Pi.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Wu Jia Pi

Non-toxic

The genuine Wu Jia Pi (南五加皮, Nan Wu Jia Pi) from Acanthopanax gracilistylus is classified as non-toxic. Toxicology studies in mice showed no deaths even at extremely high oral doses (up to 480g/kg equivalent crude drug), and 30-day subacute toxicity studies in rats and rabbits showed no significant abnormalities in blood counts, liver or kidney function, or organ morphology. However, the most critical safety concern is adulteration with Bei Wu Jia Pi (北五加皮/香加皮, Periploca sepium root bark), which contains the cardiac glycoside periplocin. Bei Wu Jia Pi is genuinely toxic and can cause nausea, vomiting, cardiac arrhythmia, and death in overdose. Its toxic mechanism is similar to digitalis-type glycosides, and injecting its extract into animals causes extreme blood pressure elevation and death within 3 to 20 minutes. Always verify the botanical identity before use.

Contraindications

Situations where Wu Jia Pi should not be used or requires extra caution

Caution

Yin deficiency with Heat or Fire (阴虚火旺). The warm, drying nature of Wu Jia Pi can further deplete Yin fluids and worsen Heat signs. The Ben Cao Jing Shu states that it should not be used when there is no Wind-Cold-Damp pathogen and Fire is present.

Caution

Liver and Kidney deficiency with Fire signs. Though Wu Jia Pi tonifies Liver and Kidney, when these organs have deficiency-Fire, the herb's warming nature can aggravate the condition.

Caution

Lung Qi deficiency or fluid insufficiency (肺气虚、水不足). The De Pei Ben Cao cautions that these two conditions are prohibitive for use of this herb.

Avoid

CRITICAL SAFETY NOTE: Do not confuse the genuine Wu Jia Pi (南五加皮, from Acanthopanax gracilistylus, Araliaceae family) with Xiang Jia Pi / Bei Wu Jia Pi (北五加皮/香加皮, from Periploca sepium, Asclepiadaceae family). Bei Wu Jia Pi contains toxic cardiac glycosides (periplocin) and can cause fatal cardiac arrhythmia in overdose. Always verify the correct botanical source.

Classical Incompatibilities

Traditional Chinese pharmacological incompatibilities — herbs or substances to avoid combining with Wu Jia Pi

Wu Jia Pi does not appear on the Eighteen Incompatibilities (十八反) or Nineteen Mutual Fears (十九畏) lists. However, the Ben Cao Jing Ji Zhu records that it "fears" (畏) snake skin (She Pi) and Xuan Shen (Scrophularia), and that Yuan Zhi (Polygala) serves as its envoy herb (使药). These are traditional compatibility notes rather than formal classical incompatibilities.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Generally advised to avoid during pregnancy. Pharmacological studies have shown that Wu Jia Pi preparations can stimulate uterine smooth muscle contraction in isolated rabbit uterus experiments, with pregnant uteri being more sensitive to this effect. While no specific teratogenic effects have been documented for the genuine herb (Nan Wu Jia Pi), the uterine-stimulating activity presents a theoretical risk of miscarriage. The additional risk of accidental use of the toxic adulterant Bei Wu Jia Pi (which contains cardiac glycosides) makes extra caution warranted during pregnancy.

Breastfeeding

Insufficient data on the transfer of Wu Jia Pi's active compounds into breast milk. The herb's pungent, warm, and drying properties could theoretically affect the quality of breast milk in some individuals. Given the lack of specific safety studies during lactation and the risk of adulteration with the toxic Bei Wu Jia Pi variety, cautious avoidance during breastfeeding is recommended unless specifically prescribed by a qualified practitioner.

Children

Wu Jia Pi has a specific classical paediatric indication: delayed walking in young children (小儿行迟), a condition attributed to Liver-Kidney insufficiency leading to weak sinews and bones. In the formula Wu Jia Pi San from the Bao Ying Cuo Yao, it is combined with Gui Jia (turtle shell), Niu Xi, and Mu Gua for this purpose. Dosage for children should be reduced proportionally based on age and body weight, typically one-third to one-half the adult dose. It is suitable for children over approximately 2 to 3 years of age. Always ensure the genuine Nan Wu Jia Pi is used, as accidental use of the toxic Bei Wu Jia Pi is especially dangerous for children.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Wu Jia Pi

No well-documented drug interactions are established for genuine Wu Jia Pi (Nan Wu Jia Pi / Acanthopanax gracilistylus) based on current pharmacological evidence. However, given its immunomodulatory effects demonstrated in preclinical studies (suppression of lymphocyte proliferation, modulation of cytokine production), theoretical caution is warranted when combining with immunosuppressant medications.

Critical warning regarding Bei Wu Jia Pi (Xiang Jia Pi): If the toxic adulterant Periploca sepium is mistakenly used, it contains cardiac glycosides similar in action to digoxin. This would create dangerous interactions with cardiac glycosides (digoxin), antiarrhythmics, potassium-depleting diuretics, and other cardiovascular medications. Always verify the botanical identity of the herb material being used.

Dietary Advice

Foods and dietary considerations when taking Wu Jia Pi

Avoid cold, raw foods and iced beverages when taking Wu Jia Pi, as its therapeutic goal is to warm the channels and expel Cold-Damp. Consuming cold foods may counteract its warming action. Moderate consumption of warming foods such as ginger, lamb, and cinnamon can support the herb's effects. Avoid excessive alcohol if not taking the herb specifically in wine form, as both alcohol and Wu Jia Pi have warming, drying properties and the combination may be overly heating for some constitutions.

Botanical Description

Physical characteristics and morphology of the Wu Jia Pi source plant

Acanthopanax gracilistylus W.W. Smith (syn. Eleutherococcus nodiflorus) is a deciduous shrub in the Araliaceae (ginseng) family, typically growing 2 to 3 metres tall. The stems are reddish and somewhat vine-like, often bearing small black thorns at the leaf nodes. The leaves are palmately compound, usually with five leaflets (though three- or four-leaflet forms are common), arranged in clusters along the branches. Small white flowers appear in spring (around March to April), developing into tiny green berries that ripen to black by early summer.

The plant favours moist habitats along hillsides, forest edges, riverbanks, and shrubby lowlands. The medicinal part is the root bark, which is peeled from the thick, hard roots after several years of growth. The root has a yellowish-black outer bark and white inner flesh surrounding a hard woody core.

Sourcing & Harvesting

Where Wu Jia Pi is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Summer to autumn. Roots are harvested after 3 to 4 years of cultivation, washed, and the root bark is peeled off and sun-dried.

Primary growing regions

The primary producing regions are Hubei, Henan, and Anhui provinces in central China. The herb is also produced in Hunan (where the famous "Hengzhou Wu Jia Pi" has been documented since the Song dynasty as a notable regional variety), Sichuan, Zhejiang, Shaanxi, Jiangxi, and parts of Jiangsu. The plant grows wild on hillsides, forest edges, and moist riverbanks, though it is also cultivated in some areas such as Anhua in Hunan. The Song-dynasty Ben Cao Tu Jing recorded production from Jiangsu, Anhui (Jianghuai region), and Hunan.

Quality indicators

Good quality Wu Jia Pi root bark comes in irregularly rolled tubes or curved strips, 4 to 15 cm long. The outer surface should be greyish-brown with irregular wrinkles and horizontal lenticel-like marks. The inner surface should be pale yellow to greyish-yellow with fine longitudinal striations. The bark should be light in weight, somewhat brittle, and break with an uneven greyish-white cross-section. It should have a subtle fragrant aroma and a slightly spicy, bitter taste. Key markers of quality: thick bark, noticeable aroma, and a greyish-white cross-section. Reject pieces that are mouldy, insect-damaged, or that have a strong, distinctive fragrance (which may indicate adulteration with the toxic Xiang Jia Pi / Bei Wu Jia Pi).

Classical Texts

Key passages from the classical Chinese medical texts that describe Wu Jia Pi and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Original: 味辛温，主心腹疝气腹痛，益气疗躄，小儿不能行，疽疮阴蚀。

Translation: Pungent and warm in nature. It mainly treats abdominal hernia pain and abdominal pain, supplements Qi, treats lameness, addresses inability to walk in children, and heals sores and genital erosion.

Ming Yi Bie Lu (《名医别录》)

Original: 疗男子阴痿，囊下湿，小便余沥，女人阴痒及腰脊痛，两脚疼痹风弱，五缓虚羸，补中益精，坚筋骨，强志意，久服轻身耐老。

Translation: It treats male impotence, dampness of the scrotum, post-urination dribbling, female genital itching, lower back pain, painful obstruction and weakness of the legs, the five types of laxity with deficiency and emaciation. It supplements the centre and benefits essence, strengthens sinews and bones, fortifies will and resolve. Long-term use makes the body light and delays aging.

Ben Cao Jing Shu (《本草经疏》)

Original (excerpt): 五加皮...辛能散风，温能除寒，苦能燥湿，二脏得其气而诸证悉瘳矣。

Translation: Wu Jia Pi ... its pungent flavour disperses Wind, its warm nature expels Cold, and its bitter taste dries Dampness. When the two organs [Liver and Kidney] receive its Qi, all symptoms are resolved.

Historical Context

The history and evolution of Wu Jia Pi's use in Chinese medicine over the centuries

Wu Jia Pi has one of the longest documented histories in Chinese herbal medicine, first appearing in the Shen Nong Ben Cao Jing (circa 200 CE), where it was listed as a "superior grade" (上品) herb. The name literally means "five-add bark" (五加皮), referring to the plant's characteristic five-leaflet compound leaves. An older classical name was "Chai Qi" (豺漆). The Shen Nong Ben Cao Jing noted that specimens with five leaflets were considered superior quality ("五叶者良").

Wu Jia Pi wine (五加皮酒) became one of the most famous medicinal wines in Chinese culture. Li Shizhen recorded the method for brewing Wu Jia Pi wine in his Ben Cao Gang Mu (1578), using the bark soaked with Dang Gui, Niu Xi, and other herbs. This tradition of medicinal wine-making continues today, with Wu Jia Pi wine remaining a popular commercial product in China. However, the Qing-dynasty physician Chen Shiduo, in his Ben Cao Xin Bian, critically challenged the popular belief that Wu Jia Pi was a general tonic, arguing that its primary action was to remove Dampness rather than to supplement, and warning that in dry climates (as opposed to the damp Jianghuai lowlands) its drying nature could be harmful.

A significant issue in the herb's history is the confusion between the genuine Wu Jia Pi (南五加皮, from the Araliaceae family) and the toxic substitute Bei Wu Jia Pi or Xiang Jia Pi (北五加皮/香加皮, from Periploca sepium of the Asclepiadaceae family). This confusion has been a persistent safety concern, and the 2005 edition of the Chinese Pharmacopoeia formally separated the two as distinct entries to prevent mix-ups.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Wu Jia Pi

1

Anti-inflammatory Diterpenoids from the Root Bark of Acanthopanax gracilistylus (Preclinical, 2014)

Wu ZY, Zhang YB, Zhu KK, et al. Journal of Natural Products, 2014, 77(11): 2342-2351.

Researchers isolated eight new diterpenoid compounds and a new triterpene acid from Wu Jia Pi root bark. Several compounds showed potent inhibition of inflammatory cytokines (IL-1 beta, IL-8, TNF-alpha) in human immune cells stimulated with bacterial endotoxin, providing a molecular basis for the herb's traditional use against inflammatory joint conditions.

DOI
2

Inhibitory Effects of Lupane-type Triterpenoid Saponins on LPS-induced Inflammatory Cytokines in Macrophages (Preclinical, 2017)

Zou QP, Liu XQ, Huang JJ, et al. Molecular Medicine Reports, 2017, 16(6): 9149-9156.

Five major lupane-type triterpenoid saponins from Acanthopanax gracilistylus were tested in macrophage cell cultures. All five significantly suppressed TNF-alpha and IL-1 beta expression. Two of the compounds also reduced the late-phase inflammatory mediator HMGB1 by inhibiting the NF-kB signaling pathway, suggesting potential for treating chronic inflammatory diseases.

PubMed
3

Immunomodulatory Effect of Acanthopanax gracilistylus Extract on Human Lymphocytes In Vitro (Preclinical, 1999)

Shan BE, Yoshida Y, Sugiura T, Yamashita U. Immunopharmacology, 1999, 43(1): 11-18.

The extract markedly suppressed proliferation of human T cells and B cells stimulated by mitogens, and reduced interferon-gamma and immunoglobulin production. The mechanism was cell cycle arrest at G0/G1 phase rather than direct cytotoxicity. Interestingly, natural killer cell activity was preserved while monocyte cytokine production was enhanced, indicating selective immunomodulation rather than general immunosuppression.

PubMed
4

Protective Effect of Acankoreanogenin A on Mice with Fulminant Hepatitis (Preclinical, 2011)

International Immunopharmacology, 2011, 11(9): 1239-1245.

Acankoreanogenin A, a triterpenoid extracted from the leaves of A. gracilistylus, significantly reduced serum levels of inflammatory markers (TNF-alpha, IL-1 beta, HMGB1) and liver enzymes (ALT, AST) in a mouse model of acute liver failure, and improved survival rates. Even delayed administration after the initial inflammatory peak still provided significant protection, suggesting potential as a liver-protective agent.

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.