Cocklebur

Botanical

What is it

Cocklebur (Xanthium species, particularly Xanthium sibiricum or cang er zi) is a weed used in traditional Chinese medicine. The fruit is used for nasal congestion, sinusitis, and skin conditions. The plant contains toxic compounds and requires careful preparation.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Nasal congestion and sinusitis (traditional)

Mixed Evidence

Traditional use is consistent in TCM. Modern clinical evidence is limited and toxicity concerns outweigh casual self-use.

How it works

Xanthium fruit contains sesquiterpene lactones, glycosides, and carboxyatractyloside (a potent hepatotoxin and renal toxin found primarily in young plant tissues and seeds). Traditional processing reduces toxicity. Decoctions of properly processed cang er zi are used for sinus complaints. The primary risk is carboxyatractyloside, which causes severe liver and kidney injury at sufficient exposure. Cases of acute hepatitis and renal failure from improperly processed Xanthium have been reported.

Dosage

Traditional decoctions use 3 to 9 g of processed fruit. Use should be guided by a qualified practitioner due to toxicity risk.

When and how to take it

Used episodically for symptoms, not as a daily supplement.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Processed Xanthium fruit (cang er zi)

Used in TCM herbal formulas for sinus and nasal complaints.

Active compounds absorbed orally.

Safety

Significant safety concerns due to carboxyatractyloside. Improperly processed material can cause acute hepatitis, renal failure, and death. Reputable processing reduces but does not eliminate risk.

Who should be cautious

Avoid in pregnancy, lactation, children, liver or kidney disease. Use only under qualified TCM practitioner guidance.

Interactions

Hepatotoxic potential increases risk when combined with other liver-stressing drugs. Avoid combination with acetaminophen, alcohol, and other hepatotoxic substances.

Frequently asked questions

Is cocklebur safe?⌄

Not for casual self-use. Even processed material has caused liver and kidney injury. Use only under expert guidance.

Should I take Xanthium for allergies?⌄

Standard antihistamines and nasal steroids have better safety profiles.

References

Cocklebur on Wikidata — Wikidata link

Cocklebur on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Cocklebur (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.