Wu Jia Pi (Acanthopanax bark) — TCM Herbal Atlas

The prickly Acanthopanax bark grows in the forests of northern China, where it withstands wind and cold—and it is precisely this resilience that it imparts to joints and tendons. During the Tang Dynasty, it was used to brew a famous herbal wine to combat wind-cold-bi.

Acanthopanax bark Acanthopanacis Bark Wu Jia Pi Wu Jia Pi

Flavor Spicy, Bitter

Temperature Warm

Meridian Liver, kidney

Plant part Bark

Class Upper class

Direction of action Dispels wind and dampness

Helps with Humidity

Wu Jia Pi—Acanthopanax bark—is a warming herb that Wind–Humidity flushes it out of the joints while strengthening the liver and kidneys.

As a close relative of Siberian ginseng, it strengthens bones and tendons. It is classified in the highest category of the *Shén Nóng Běn Cǎo Jīng*.

Effect from a TCM perspective

Wu Jia Pi has a warm and pungent-bitter effect on the Liver and Kidney meridians. It combines two modes of action: dispelling wind-dampness from the joints and tonifying the tendons and bones.

Expels wind moisture: releases blockages in joints and meridians
Strengthens tendons and bones: On Tonifying the Liver and Kidneys
Nourishes Liver Yin and Kidney Yang: heats the lower heating system
Moves water: wicks away trapped moisture from the lower body
Relieves Bi syndromes: Relieves joints and meridians of wind, dampness, and cold
Promotes child development: Helps with delayed walking and soft bones

Application & dosage

Wu Jia Pi is used in a decoction with 5–15 g administered daily. As a tonic for bones and tendons, the herb can also be used long-term—it is traditionally particularly valued in the form of Wu Jia Pi Jiu, a wine extract.

In powder form (Fen), they are sufficient 3–5 g daily. The dosage follows this pattern: for acute Bi syndromes, tend toward the upper limit; for long-term use of tonics, use the middle dose.

Dosage forms

Decoction (seaweed): 5–15 g, standard dosage form
Wine Extract (Wu Jia Pi Jiu): Traditional tonic formula for bones and joints
Powder (Fen): 3–5 g per day; easily absorbed
Granules (Keli): A modern form of preparation, convenient for daily use
Alcoholic tincture: Can be used externally for localized joint inflammation with cold therapy

Dosage

Standard dose in a decoction: 5–15 g per day
Powder: 3–5 g per day
Wine extract: Traditionally, 10–20 ml daily
Long-term use as a tonic: low to moderate dose (5–9 g)

Niu Xi Achyranthes root

Du Huo Angelica

Du Zhong Eucommia bark

Sheng Jiang Fresh ginger

Qiang Huo Notopterygium root

Fu Ling Poria mushroom

History & Tradition

Wu Jia Pi is one of the oldest Chinese herbal remedies and is mentioned as early as the Shén Nóng Ben Cao Jing (approximately 200 B.C. to 100 A.D.) was classified among the highest-quality herbs—those that promote health and longevity without causing harm even with prolonged use. Even back then, the bark was considered a valued remedy for stiffness and weakness, particularly in cases of developmental delays in children and in old age.

In the classic work *Běn Cǎo* Gāng Mù (1578) Li Shi Zhen describes the bark in detail and distinguishes between various Acanthopanax species. A special tradition developed around Wu Jia Pi Jiu, a wine extract that has been produced since the Tang Dynasty (618–907) as a tonic for the elderly, warriors, and scholars. Legend has it that residents of certain mountain villages in Sichuan who regularly drank Wu Jia Pi Jiu reached an exceptionally advanced age while remaining fully mobile.

In modern TCM, Wu Jia Pi is an integral part of numerous classical formulas. The combination of Wind–Moisture–Repelling Its tonifying effect makes it particularly valuable for patients for whom purely purgative herbs would be too debilitating—a property praised in the classical texts as „bu xie jian shi" (both tonifying and purgative).

Contraindications & caution

Not at Yin Deficiency with Signs of Heat apply.
Be careful with severe internal heat, since the warming nature of the herb can intensify heat.
It is important to distinguish between the two: The bark of Acanthopanax gracilistylus (Nan Wu Jia Pi) must not be confused with the poisonous bark of Periploca sepium (Bei Wu Jia Pi)—the latter contains cardiotoxic cardenolides. A definitive botanical identification is therefore essential.
In the Pregnancy Only under the supervision of a qualified professional.

Botany

Acanthopanax gracilistylus W.W. Sm. (syn. Eleutherococcus gracilistylus) is a deciduous, thorny shrub in the araliad family (Araliaceae). It reaches a height of 2–3 m. The leaves are palmately pinnate with 3–5 leaflets; the flowers are small and yellowish-green, arranged in umbels. The bark of the 2–3-year-old roots and the base of the stem is used in TCM: it is grayish-brown, longitudinally furrowed, and, in cross-section, has a light-colored, corky outer layer over a thin bast layer.

From a botanical perspective, it is important to distinguish it from related species: Acanthopanax senticosus (Siberian ginseng, Eleutherococcus senticosus) is used for its root as an adaptogenic tonic, whereas Periploca sepium—also sold commercially as „Wu Jia Pi“—belongs to a completely different plant family (Dogbane family, Apocynaceae) and contains cardiotoxic cardenolides. A definitive botanical identification is therefore essential for safe use.

Occurrence

Native to central China: the provinces of Hubei, Sichuan, Shanxi, Henan, and Anhui
Grown at elevations of 200–1,500 m in mountainous regions with a temperate-humid climate
Prefers open forests, forest edges, and shrublands on fresh, loamy soils
Wild populations in Korea, Japan, and neighboring parts of East Asia
Main growing regions today: Hubei, Sichuan, and Shaanxi, where the crop is grown commercially

Harvest time

Main harvest: Spring (March–May) and Fall (September–October)
Spring Harvest: Preferably in March–April, when the sap rises in the bark
Fall Harvest: September–October, after the growing season; highest nutrient content
Age of the plant: The root bark and the bark at the base of the stem are harvested from 3- to 5-year-old plants
Harvesting method: gently peeling the bark off in strips; the roots remain in the ground

Processing

The freshly harvested bark is processed into a medicinal product in several steps. Rapid drying is crucial to prevent mold growth and the loss of active ingredients. Different processing methods are used depending on the desired therapeutic effect.

Remove any soil and coarse cork from the fresh bark
Cut into strips 5–10 cm long
Dry in the open air or in a drying oven at 40–60 °C until the residual moisture content is below 12 %.
Finished drug: gray-brown, slightly curved strips of bark with a characteristic resinous odor
Store in airtight containers in a cool, dry place, protected from light

Raw drug (Sheng): Standard Format for Wind–Humidity–Patterns
Processed with salt water (Yan Zhi): strengthens the connection to the kidneys and bones
Wine—processed (Jiu Zhi): promotes circulation; traditionally used for Wu Jia Pi Jiu