Cang Er Zi (Xanthium sibiricum): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Cang Er Zi work for nasal congestion?

Cang Er Zi (Xanthium sibiricum) contains active compounds including xanthanolides, xanthatin, and alkaloids that help open nasal passages and reduce inflammation. In Traditional Chinese Medicine, it is classified as a warming herb that disperses wind-damp and opens nasal orifices. The sesquiterpene lactones may reduce nasal mucosal swelling and modulate inflammatory pathways. Evidence level: C (preliminary evidence).

Does Cang Er Zi interact with any medications?

Cang Er Zi may interact with hepatotoxic medications due to its potential liver toxicity at high doses. Concurrent use with acetaminophen, statins, or other liver-metabolized drugs may increase the risk of liver damage. It may also interact with immunosuppressants due to its immunomodulatory effects. Patients taking anticoagulants should exercise caution. Consult a healthcare provider before combining with prescription medications. Evidence level: C.

What is the recommended dosage for Cang Er Zi?

The standard adult dosage for Cang Er Zi is 3-9 grams of dried fruit daily, typically prepared as a decoction. For standardized extracts, approximately 300mg daily is commonly used. Dosage should be individualized based on condition severity and patient tolerance. Due to hepatotoxic potential, avoid exceeding recommended amounts. Long-term use requires professional supervision. Evidence level: Traditional/C.

Is Cang Er Zi safe during pregnancy?

Cang Er Zi is contraindicated during pregnancy and should be strictly avoided. The herb contains compounds such as carboxyatractyloside that may pose risks to fetal development. Traditional Chinese Medicine classifies it as unsafe for pregnant women. Additionally, its potential hepatotoxicity poses additional risks during pregnancy when liver metabolism is already stressed. Women who are pregnant or breastfeeding should not use this herb. Evidence level: Traditional.

What are the side effects of Cang Er Zi?

Cang Er Zi can cause hepatotoxicity (liver damage) at high doses, which is the most serious concern. Other reported side effects include skin rash, gastrointestinal upset, and headache. Signs of liver toxicity may include jaundice, fatigue, and abdominal pain. The herb is contraindicated in patients with pre-existing liver disease or blood deficiency. Proper dosing and duration limits are essential to minimize adverse effects. Evidence level: C.

What conditions does Cang Er Zi treat?

Cang Er Zi is primarily used in Traditional Chinese Medicine to treat nasal congestion, rhinitis, and sinusitis by opening nasal orifices and dispersing wind-damp. It is also used for headaches, particularly those associated with nasal congestion, and wind-damp arthralgia (joint pain). As a warming herb, it helps clear nasal passages and relieve associated symptoms. Evidence level: C (preliminary clinical evidence supporting traditional use).

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Cang Er Zi (Xanthium sibiricum) is a traditional Chinese medicine used primarily for respiratory conditions and inflammation [PMID: 26287695, 36720451].

Background

Cang Er Zi refers to the dried ripe fruits of Xanthium sibiricum, a plant used in traditional Chinese medicine [PMID: 26287695, 19185132].

Traditional uses

It is traditionally used to treat nasal congestion, nasal discharge, allergic rhinitis, sinusitis, wind-cold headaches, urticaria, and arthritis [PMID: 26287695, 36720451, 30669496].

Active compounds

Key constituents include sesquiterpene lactones (such as xanthatin), phenylpropanoids (including xanthiifructins), lignans, and various caffeoylquinic acids [PMID: 36720451, 32787575, 29933677, 19185132]. It also contains toxic diterpenoid glycosides: carboxyatractyloside and atractyloside [PMID: 26287695].

Mechanism of action

Anti-inflammatory effects are mediated through the inhibition of nitric oxide production and reduction of Tnf-α, Il-1β, and Il-6 mRNA expression [PMID: 36720451, 32787575]. In asthma models, sesquiterpene lactones modulate the Th1/Th2 balance [PMID: 35263672], while xanthatin targets STAT3 to inhibit TSLP release and NK2 cell polarization [PMID: 41621761]. In rheumatoid arthritis models, the compound tomentosin suppresses M1 polarization by increasing MERTK activation via GAS6 regulation [PMID: 37011736].

Clinical evidence

Evidence APediatric Allergic Rhinitis

Cang-Er-Zi-San (CEZS) is evaluated for efficacy and safety compared to conventional therapy [PMID: 39705439]

Evidence DAsthma

Sesquiterpene lactones from X. sibiricum alleviate asthma by modulating Th1/Th2 balance in murine models [PMID: 35263672]

Evidence DRheumatoid Arthritis

Alcohol extracts inhibit proliferation and promote apoptosis of human fibroblast-like synovial-RA cells [PMID: 36596012]; tomentosin shows anti-inflammatory activity in CIA mice [PMID: 37011736]

Safety & adverse effects

Reported toxicities include hepatotoxicity [PMID: 26357619], kidney injury, neurotoxicity, and cardio-toxicity [PMID: 29271143]. A case report described intermittent muscular spasms of the face, neck, and upper extremities in a 17-year-old female following therapeutic use of Cang Er Zi Wan [PMID: 20521353]. External application or oral use may cause skin reactions, including exfoliative dermatitis [PMID: 29271143].

Evidence summary

Evidence consists primarily of phytochemical analysis, in vitro cell studies, and animal models (Level D), with one systematic review/meta-analysis (Level A) focusing on pediatric allergic rhinitis. Safety data is based on case reports and reviews.

PubMed sources

1.PMID: 19185132 (2009) — Authentication and quantitative analysis on the chemical profile of Xanthium fruit (Cang-Er-Zi) by high-performance liquid chromatography-diode-array detection tandem mass spectrometry method. · Analytica chimica acta
2.PMID: 32627466 (2020) — [Chemical constituents from Xanthii Fructus]. · Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica
3.PMID: 39705439 (2024) — Evaluation of the efficacy and safety of Chinese medicine Cang-Er-Zi-San in the treatment of allergic rhinitis in children: A meta-analysis and systematic review. · Medicine
4.PMID: 26357619 (2014) — Traditional Chinese Medicine Induced Liver Injury. · Journal of clinical and translational hepatology
5.PMID: 20521353 (2010) — Muscle spasm associated with therapeutic use of Cang Er Zi Wan.

Cang Er Zi

Sources & Citations

Calculate a safe dose of Cang Er Zi