Fruits and seedsExterior-releasingFructus Xanthii

Cang Er Zi (Xanthium Fruit)

Q: What is Cang Er Zi? Are Xin Yi, Bai Zhi and Xi Xin the same?

Official Cang Er Zi (苍耳子) is the dried mature fruit with involucre of Xanthium sibiricum . The pharmacopoeial name is Xanthii Fructus . Xin Yi is acrid-warm: releases the exterior, disperses wind-cold and opens the nasal orifices. Bai Zhi is acrid-warm: releases the exterior, stops pain, opens the nose, dries damp and checks vaginal discharge. Xi Xin is acrid-warm and toxic: releases the exterior, stops pain, opens orifices and warms the Lung to transform rheum—dose-limited. Write Cang Er Zi or fried Cang Er Zi; fry and remove the spines. Use caution in blood-vacuity headache. It is toxic; do not overdose.

Q: What are the TCM properties and traditional uses of Cang Er Zi?

According to the Chinese Pharmacopoeia, Cang Er Zi is acrid, bitter and warm; toxic , enters the Lung channel, and acts to disperse wind-cold, open the nasal orifices and dispel wind-damp . It is used for wind-cold headache, nasal congestion with runny nose, allergic rhinitis, deep-source nasal congestion, wind-rash itching, and damp painful obstruction with spasm. Acrid-bitter, warm-drying and toxic, it suits wind-cold deep-source nasal congestion—not blood-vacuity headache, or large long-term doses.

Q: How do you choose raw versus fried Cang Er Zi?

Practice more often uses fried Cang Er Zi : fry to yellowish-brown, remove spines; milder toxicity and aromatic. Raw fruit is more irritating and toxic, not for routine self-decoction. Externally, an appropriate amount may be washed or pounded. Do not chew raw cocklebur or use seedlings as medicine.

Q: What is the usual dosage? Can it be drunk daily as a rhinitis tea?

The pharmacopoeial decoction dose is 3–10 g . It is not a four-season “Cang Er Zi rhinitis tea.” It is toxic; overdose can injure the Liver. Wind-cold deep-source nasal congestion needs a practitioner to name a short course; it does not replace sinus and allergy assessment.

Q: What are the contraindications? Can it be used in pregnancy?

It is toxic; do not overdose. Unsuitable for blood-vacuity headache. Use caution in pregnancy. Stop and seek care at once for nausea, abdominal pain, fatigue, jaundice and drowsiness. Coma, convulsions and oliguria are emergencies. Children should not self-medicate.

Q: How do you choose and store Cang Er Zi?

Choose plump fruits that are yellowish-brown or yellowish-green, with intact hooked spines, faint odor and a slightly bitter taste . Moldy, moth-eaten, rancid lots mixed with seedlings are discarded. Store dry. Practice more often uses the fried, de-spined fruit. Buy pharmacopoeial Cang Er Zi; do not replace dispersing wind-cold and opening the nasal orifices with raw cocklebur or an unidentified hooked aster-family fruit by equal weight.

A practical guide to Cang Er Zi: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

View Herb Profile →

Last reviewed Oct 13, 2026

Quick Facts

Latin Name	Fructus Xanthii
Chinese Name & Pinyin	蒼耳子 · Cang Er Zi
Medicinal Part	Fruits and seeds
The herb	Cang Er Zi is the dried cocklebur fruit in its involucre. Use the dry-fried piece. Xin Yi and Bai Zhi are different official drugs. Do not use it raw. Do not collect it yourself.
Nature and channels	Acrid, bitter, warm, toxic. Enters the Lung. Acridity disperses wind-cold and unblocks the nose. Bitterness dries dampness.
Pharmacopoeia line	Disperses wind-cold. Unblocks the nasal orifices. Dispels wind-damp. Used for wind-cold headache, stuffed nose and runny nose, allergic sniveling, deep-source nasal congestion, wind-rash itch, and damp bi with contracture.
Pattern cues	Stuffed nose and turbid discharge. Deep-source nasal congestion. Wind-cold headache. Wind-rash. Damp bi.
In this article	Cang Er Zi versus Xin Yi, Bai Zhi, and Xi Xin. Why it must be fried. Why the dose stays small. Why it is toxic. Who must skip it.

What Is Cang Er Zi?

Cang Er Zi (苍耳子; Cāng Ěr Zǐ; Latin: Xanthii Fructus; English: xanthium fruit / cocklebur fruit) is the dried ripe fruit of Xanthium sibiricum Patr., still in its involucre. In Chinese medicine it is a warm, acrid exterior-releasing herb. It is acrid, bitter, and warm, toxic, enters the Lung channel, and its core actions are to disperse wind-cold, unblock the nasal orifices, and dispel wind-damp. Clinic use is dry-fried Cang Er Zi, which reduces toxicity and removes the hooks. Raw fruit and large amounts have been linked to liver injury. Do not pick it and use it raw. The usual decoction dose is 3–9 g. It is not Xin Yi. Magnolia flower is aromatic and opens the orifices, with a different safety profile. Cang Er Zi also dispels wind-damp and stops itch. It is not Bai Zhi. Dahurian angelica travels Yangming and also dries dampness and stops leukorrhea. Blood-deficiency headache and impaired liver or kidney function are cautions or contraindications.

It is used most often for three patterns:

Stuffed nose, deep-source nasal congestion, allergic sniveling — turbid discharge, loss of smell
Wind-cold headache
Wind-rash itch and damp painful obstruction with contracture

Acrid-warm and toxic, it is not a daily “open-the-nose cocklebur tea.” Dispersing when there is no wind-cold-damp consumes blood.

When wind-cold-damp blocks the nasal orifices, stuffed nose, turbid discharge, and forehead pain are common. Cang Er Zi is acrid, bitter, and warm. It disperses and unblocks, which is why it is paired with Xin Yi, Bai Zhi, and Bo He in Cang Er Zi San. It moves more than it moistens. Dry mouth, nosebleed, and yin-deficiency fire get drier if more warmth is added.

Cang Er Zi is not a catch-all sinus fruit. In blood deficiency, existing liver or kidney injury, or a large raw dose, using it alone can cause harm. Dry-fried use, or a place in Cang Er Zi San, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis and a check of contraindications.

Cang Er Zi: Materia Medica Profile

Identification & Quality Standard

Fructus Xanthii

Botanical Origin

The mature fruit with involucre of Xanthium sibiricum Patr.(Asteraceae). Harvest when the fruit matures in autumn, dried, and cleaned stems, leaves and other foreign matter.

Production Regions

Primarily produced in Chinese provinces of Shandong, Jiangxi, Hubei, Jiangsu.

Quality Requirements

Superior medicinal material is large, full, yellowish-brown.

Macroscopic Features

Fusiform or oval shape. Externally yellowish-brown or yellowish-green, covered in burrs, apex has two relatively thick thorns, which may be separated or joined together, and base has fruit stem scars. Hard but pliable texture; a septum at the center of the transverse section; 2 loculi, with 1 achene in each loculus. Achene is slightly fusiform with one relatively flat side, apex has one raised stylus base; thin fruit skin, grayish-black, with longitudinal wrinkles. Seed coat is membranous, pale gray, 2 loculi, oily. faint odor; taste slightly bitter.

3 Sourcing and Quality Identification

While traditional texts highly value certain regions for harvesting, the actual quality depends on the plant variety, harvest timing, and how it is processed and stored.

Major Regions: It is primarily produced in Northeast, North, East, and Northwest China.
Quality Indicators: High-quality Cang Er Zi is yellowish-green or brownish, firm, and covered in dense hook-like spines. When broken open, the inner seed should be white and oily, with a slightly bitter taste and a distinct aroma.
Raw vs. Stir-fried: Raw ones have harder spines, while the stir-fried version is yellower, slightly crispier, and much more aromatic. Care must be taken to avoid confusing it with other spiky fruits from the same plant family.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Acrid, Bitter; WarmLung

1. 2 Historical Records

Classic TCM texts have documented this herb for centuries:

Shen Nong Ben Cao Jing noted its use for cold-induced headaches, rheumatic pain, and muscle issues.
Ben Cao Gang Mu highlighted its effectiveness for nasal issues like sinusitis and nosebleeds.
Other texts like the Xin Xiu Ben Cao and Zhong Hua Ben Cao consistently echo its core functions: dispersing wind-cold, unblocking the nose, and relieving wind-damp pain.

2. 3 Evolution of TCM Understanding

Historically, early practitioners focused heavily on its ability to expel wind-dampness to treat joint and limb pain. Over time, its clinical application expanded, and its remarkable ability to unblock nasal passages became a major focus. Modern TCM practitioners also place a strong emphasis on its mild toxicity. It requires strict dosage control, should not be overused, and is generally not recommended for individuals with Yin deficiency and excessive heat.

Core Efficacies & Traditional Applications

Traditional Functions

Disperses wind, opens the nose, eliminates dampness-wind. Wind-cold headache, nasal congestion and runny nose, rhinitis, nasosinusitis, red rashes and itch, moisture impediment and muscular constriction.

1. 1 First Primary Action: Dispersing Wind-Cold and Unblocking Nasal Passages

The core traditional function is dispersing wind-cold and unblocking the nasal passages, specifically targeting external wind-cold invasions.

Common Symptoms: Nasal congestion and clear runny nose after catching a cold, or headaches and stuffiness caused by chronic or allergic rhinitis. It is often accompanied by an aversion to cold, mild fever, and a lack of sweating.
Common Pairings: It is frequently paired with Xin Yi (Magnolia Flower) and Bai Zhi (Angelica Root) to strengthen nasal clearing, or with Fang Feng (Saposhnikovia Root) and Jing Jie (Schizonepeta) to enhance the wind-cold dispersing effect.
Caution: Do not use this herb for wind-heat colds (characterized by thick yellow mucus) or nasal dryness and bleeding caused by Yin deficiency with internal heat.

2. 2 Second Primary Action: Dispersing Wind-Dampness and Relieving Pain

It also dispels wind-dampness, unblocks meridians, and relieves pain, targeting joint and limb issues caused by wind-cold-damp invasions.

Common Symptoms: Joint pain, limb spasms, and stiffness that worsen in the cold and improve with warmth. It is also used for skin itching or eczema caused by wind-dampness.
Common Pairings: Often paired with Du Huo (Pubescent Angelica) and Wei Ling Xian (Clematis Root) for joint pain, or with Ku Shen (Flavescent Sophora) and Di Fu Zi (Kochia Fruit) for skin discomfort.
Caution: It is not suitable for joint pain or itching caused by Yin deficiency with internal heat.

3. 3 Common Single Herb Pairing: The Herb Pair

Cang Er Zi (Xanthium) and Xin Yi (Magnolia Flower) are a classic pairing. Both herbs share the ability to disperse wind-cold and unblock the nose. When used together, they synergize to relieve nasal congestion, runny noses, and headaches. However, this pair should only be used after a professional TCM diagnosis and is not recommended for random self-medication.

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. 1 Key Chemical Components

Modern analysis shows that Cang Er Zi contains volatile oils, flavonoids, glycosides (such as atractyloside), alkaloids, and phenolic acids.

Lab Observations: In vitro and animal studies suggest that certain extracts may have an impact on inflammation markers and could potentially help soothe nasal mucosal inflammation. However, these are strictly animal-level observations and have not been clearly validated in human clinical trials.

2. 2 Modern Pharmacological Focus

Today, scientific research primarily focuses on its potential anti-inflammatory, anti-allergic, and immune-regulating properties. While lab tests suggest its extracts might help regulate the release of inflammatory mediators, this research is still in its early, foundational stages.

3. 3 Limitations of Modern Research

When looking at modern studies, it is crucial to keep a few limitations in mind:

Lab vs. Clinical Reality: Results from test tubes and animal models do not automatically translate to human efficacy or safety.
Extracts vs. Whole Herbs: Lab studies often use isolated single components or specific extracts. This is vastly different from the traditional Cang Er Zi decoction, which relies on the complex interaction of the whole herb.
Inconsistent Variables: Different studies use varying dosages and preparation methods, making it hard to draw unified scientific conclusions.
Holistic Action: You cannot judge the entire herb based on a single chemical component; its traditional efficacy comes from the combined action of all its parts.

Comparing Similar Herbs

1. 2 Similarities with Comparable Herbs

When comparing Cang Er Zi (Xanthium) with Xin Yi (Magnolia Flower), they share three main traits:

Both disperse wind-cold and unblock nasal passages.
Both treat nasal congestion and runny noses from wind-cold colds or rhinitis.
Both require strict caution and dosage control for individuals with Yin deficiency and internal heat.

2. 3 Core Differences

Nature and Toxicity: Cang Er Zi is warm, pungent, bitter, and has a mild toxicity. Xin Yi is warm and pungent, but is non-toxic.
Focus of Action: Cang Er Zi treats nasal issues but also clears wind-dampness for joint pain and skin issues. Xin Yi is highly focused on just the nasal passages and wind-cold.
Movement (Qi Regulation): Cang Er Zi moves upward (to the head) but its bitterness also gives it a slight downward-draining effect for dampness. Xin Yi acts purely upwards.
Safety Limits: Because of its mild toxicity, Cang Er Zi requires stricter dosage control than the safer, non-toxic Xin Yi.

3. 4 One-Sentence Summary

Cang Er Zi balances nasal clearing with joint and skin pain relief, whereas Xin Yi focuses purely on unblocking the nose and dispersing wind-cold.

Classical Formulas Containing Cang Er Zi

Cang Er San

蒼耳子散

Formula CategoryExterior-Releasing FormulasPrimary PatternWind-ColdPrimary FunctionDisperse wind, unblock the noseRelated ConditionsNasal Congestion·Headache·Allergic Rhinitis

View Formula Profile Read Complete Guide

Formulas vs. Single Herbs

Synergy is Key: A formula is a balanced team. The healing power comes from how the herbs interact, so a single herb cannot simply replicate a full formula's effects.
Holistic Balance: The exact dosage and combination in a formula affect the entire body. Never try to mix or alter these formulas at home based on internet articles.

Diet & Daily Home Use

1. 1 Home Tea Application

Recipe: Cang Er Zi Xin Yi Cha (Xanthium and Magnolia Flower Tea).
Ingredients: 3g of stir-fried Cang Er Zi (Xanthium), 2g of Xin Yi (Magnolia Flower), and 1 slice of fresh ginger.
Method: Wrap the herbs in a cheesecloth bag, place in a cup with ginger, and brew with boiling water for 10 to 15 minutes. Can be re-steeped 2 to 3 times.
Use Case: Ideal for mild nasal congestion or clear runny noses caused by autumn/winter wind-cold, or chronic rhinitis that worsens in the cold.
Usage Limit: 2 to 3 times a week. Do not drink continuously.
Caution: You must use the stir-fried version of Cang Er Zi to reduce toxicity, never the raw version. Not for those with yellow mucus or dry mouths.

2. 2 Preparation Differences

Raw Cang Er Zi is more toxic and has hard, irritating spines. Stir-fried Cang Er Zi has reduced toxicity, is crispier, and is much safer for decoctions. When boiling at home, crush the stir-fried seeds, soak in water for 30 minutes, and simmer over a low flame for about 20 minutes alongside other herbs.

3. 3 Dosage and Usage Cycle

Traditional clinical doses range from 3 to 10 grams. For dietary or home tea use, the dose must be much lower. Do not use it long-term. Even for dietary use, do not consume it consecutively for more than 1 week.

Contraindications & Safety Warnings

1. 1 Not Suitable For

Yin Deficiency: People who frequently experience dry mouth, hot hands and feet, or are prone to "internal fire."
Vulnerable Populations: Pregnant and nursing women must avoid it due to a lack of safety data. Children and the elderly should be extremely cautious.
Organ Health: People with abnormal liver or kidney function, as the mild toxicity can increase the organ burden.
Allergies: Anyone allergic to plants in the Asteraceae (daisy) family.

2. 2 Drug Interactions and Dietary Notes

Drug Interactions: Cang Er Zi may interact with blood thinners, blood pressure medications, diabetes drugs, and sedatives. For example, it might increase the risk of bleeding if taken with anticoagulants.
Consult a Professional: Always consult your doctor or pharmacist before combining this herb with prescription medications.

3. 3 Adverse Reactions and Risks

Overdose Risks: Because it contains mild toxicity, overusing it can cause headaches, dizziness, nausea, vomiting, abdominal pain, and in severe cases, liver and kidney damage.
Seek Immediate Help: If you experience severe discomfort, allergic reactions, persistent vomiting, breathing difficulties, or changes in consciousness, stop using it immediately and seek emergency medical care.

Frequently Asked Questions About Cang Er Zi

What is Cang Er Zi? Are Xin Yi, Bai Zhi and Xi Xin the same?

Official Cang Er Zi (苍耳子) is the dried mature fruit with involucre of Xanthium sibiricum. The pharmacopoeial name is Xanthii Fructus. Xin Yi is acrid-warm: releases the exterior, disperses wind-cold and opens the nasal orifices. Bai Zhi is acrid-warm: releases the exterior, stops pain, opens the nose, dries damp and checks vaginal discharge. Xi Xin is acrid-warm and toxic: releases the exterior, stops pain, opens orifices and warms the Lung to transform rheum—dose-limited. Write Cang Er Zi or fried Cang Er Zi; fry and remove the spines. Use caution in blood-vacuity headache. It is toxic; do not overdose.

What are the TCM properties and traditional uses of Cang Er Zi?

According to the Chinese Pharmacopoeia, Cang Er Zi is acrid, bitter and warm; toxic, enters the Lung channel, and acts to disperse wind-cold, open the nasal orifices and dispel wind-damp. It is used for wind-cold headache, nasal congestion with runny nose, allergic rhinitis, deep-source nasal congestion, wind-rash itching, and damp painful obstruction with spasm. Acrid-bitter, warm-drying and toxic, it suits wind-cold deep-source nasal congestion—not blood-vacuity headache, or large long-term doses.

How do you choose raw versus fried Cang Er Zi?

Practice more often uses fried Cang Er Zi: fry to yellowish-brown, remove spines; milder toxicity and aromatic. Raw fruit is more irritating and toxic, not for routine self-decoction. Externally, an appropriate amount may be washed or pounded. Do not chew raw cocklebur or use seedlings as medicine.

What is the usual dosage? Can it be drunk daily as a rhinitis tea?

The pharmacopoeial decoction dose is 3–10 g. It is not a four-season “Cang Er Zi rhinitis tea.” It is toxic; overdose can injure the Liver. Wind-cold deep-source nasal congestion needs a practitioner to name a short course; it does not replace sinus and allergy assessment.

What are the contraindications? Can it be used in pregnancy?

It is toxic; do not overdose. Unsuitable for blood-vacuity headache. Use caution in pregnancy. Stop and seek care at once for nausea, abdominal pain, fatigue, jaundice and drowsiness. Coma, convulsions and oliguria are emergencies. Children should not self-medicate.

Can Cang Er Zi open the nose, disperse wind-cold and dispel wind-damp?

It can help wind-cold nasal congestion and deep-source nasal congestion. Deep-source runny nose joins magnolia flower, Angelica dahurica and mint in Cang Er Zi San. Wind-rash itching and damp obstruction may enter a short formula. It disperses wind-cold, opens the nasal orifices and dispels wind-damp—not a specific for every rhinitis, every headache or every itch. Purulent discharge with fever must exclude bacterial sinusitis.

Can Cang Er Zi be drunk daily as an antiallergy, nose-opening or sinus tea?

Wind-cold deep-source nasal congestion and allergic rhinitis may enter a short formula; blood vacuity only grows more injured as it dries. “Cang Er Zi cures rhinitis” does not replace allergen and imaging assessment. Dispersing wind-cold and opening the nasal orifices should name fried Cang Er Zi 3–10 g.

How do you choose among Cang Er Zi, Xin Yi, Bai Zhi, Xi Xin and Bo He?

Xanthium is acrid-bitter-warm and toxic: disperses wind-cold, opens the nose and dispels wind-damp—deep-source runny nose and damp obstruction. Magnolia flower is acrid-warm: releases the exterior and opens the nose—nasal blockage. Bai Zhi is acrid-warm: releases the exterior, stops pain and opens the nose. Asarum is acrid-warm and toxic: releases the exterior, stops pain, opens orifices and warms the Lung. Mint is acrid-cool: courses wind-heat, clears the head and benefits the throat. Wind-cold turbid snivel favors Cang Er Zi with Xin Yi and Bai Zhi (Cang Er Zi San); wind-heat blockage favors mint; severe pain may use limited Xi Xin. They may be paired; blood vacuity cautions Cang Er Zi; do not overdose Xi Xin.

Which herbs is Cang Er Zi combined with? What are the representative formulas?

Deep-source nasal congestion joins magnolia flower, Angelica dahurica and mint in Cang Er Zi San. Write fried Cang Er Zi 3–10 g, spines removed; it is toxic—do not overdose; use caution in pregnancy.

How do you choose and store Cang Er Zi?

Choose plump fruits that are yellowish-brown or yellowish-green, with intact hooked spines, faint odor and a slightly bitter taste. Moldy, moth-eaten, rancid lots mixed with seedlings are discarded. Store dry. Practice more often uses the fried, de-spined fruit. Buy pharmacopoeial Cang Er Zi; do not replace dispersing wind-cold and opening the nasal orifices with raw cocklebur or an unidentified hooked aster-family fruit by equal weight.

Related Products

Nong's Cang Er San (Xanthium Powder) 5:1 Concentrated Granules $46.97

Hoi Tin Cang Er Zi San (Xanthium Fruit Powder) 5:1 Concentrated Granules $24.93

Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.