Herb

Wu Jia Pi

Slenderstyle acanthopanax bark | 五加皮

Also known as:

Acanthopanax Rootbark

Wu Jia Pi

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Properties

Wind-Damp dispelling herbs (祛风湿药) · Warm

Traditionally supports*

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

Parts Used

Bark (皮 pí / 树皮 shù pí)

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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About This Herb

Traditional Chinese Medicine background and properties

Herb Description

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.

Herb 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)

Main Actions

  • 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 that reveal what's out of balance in the body. Wu Jia Pi is traditionally associated with these specific patterns.

The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.

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

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)

This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page

Product Details

Manufacturing, supplier, and product specifications

Product Type

Granules

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Botanical & Sourcing

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).

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.

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.

Supplier Information

Treasure of the East

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Miscellaneous Info

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Usage & Safety

How to use this herb and important safety information

Important Medical Disclaimer

The information provided here is for educational purposes only and is not intended as medical advice or to replace consultation with a qualified healthcare professional. This herb is a dietary supplement and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease.

Always consult with a qualified healthcare provider, particularly if you are pregnant, nursing, have a medical condition, or are taking other medications. Discontinue use and consult your healthcare provider if you experience any adverse reactions.

Recommended Dosage

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Instructions for safe storage and consumption

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Traditional Dosage Reference

Standard

5-10g

Maximum

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.

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.

Processing Methods

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.

Toxicity Classification

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

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

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

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.

Pediatric Use

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

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

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.

Cautions & Warnings

Although this formula is typically safe for most individuals, it may cause side effects in some people. Pregnant women, nursing mothers, postpartum women, and those with liver disease should use the formula with caution.

As with any Chinese herbal remedy, it is advisable to seek guidance from a qualified TCM practitioner before beginning treatment.