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Limited evidenceGeneral health

Burdock Root

One small Iranian trial found burdock root tea lowered inflammatory and oxidative markers in knee osteoarthritis, but it never reported pain or function. Everything else — blood sugar, skin, 'blood purification' — is animal and test-tube work.

What the science says

  • Inflammatory and oxidative markers in knee osteoarthritis Limited evidence

    In 36 patients aged 50-70 with knee OA, three cups of burdock root tea daily (2 g per 150 mL) for 42 days on top of standard acetaminophen and glucosamine significantly lowered IL-6 (p=0.002), hs-CRP (p=0.003) and malondialdehyde (p<0.001) while raising total antioxidant capacity (p<0.001) and SOD activity (p=0.009). Crucially, the trial reported biomarkers only — no pain scores, no WOMAC, no function — and the control arm drank plain hot water, so it was not blinded.

  • Blood sugar control Limited evidence

    Reviews of Arctium lappa document antihyperglycemic activity for arctiin, chlorogenic acid and the root's inulin in cell and rodent models, with plausible mechanisms including alpha-glucosidase inhibition. No randomised controlled trial has tested burdock root on fasting glucose or HbA1c in humans. Treat the diabetes marketing as untested.

  • 'Blood purifier' and skin claims Limited evidence

    Burdock's reputation for acne, eczema and psoriasis comes from Western and Japanese folk traditions, not from trials. There is no controlled human study of oral burdock for any dermatological outcome, and 'blood purification' is not a measurable physiological process.

Dosage & safety

Studied doseThe osteoarthritis trial used 6 g/day of dried root, brewed as three separate 2 g cups of tea taken half an hour after meals for 42 days. Capsules are typically sold at 500-1000 mg once or twice daily, far below the studied amount. Traditional decoction range is 2-6 g dried root per dose.
SafetyBurdock is an Asteraceae plant — cross-reactivity with ragweed and related pollens is possible. The most important historical hazard is adulteration: documented cases of anticholinergic poisoning (dry mouth, blurred vision, hallucinations, tachycardia) came from burdock root tea contaminated with similar-looking belladonna root, so buy from suppliers who identity-test raw material. Burdock has mild diuretic and blood-glucose-lowering effects, so watch for additive effects with diuretics and diabetes medication. Traditionally avoided in pregnancy due to reported uterine stimulation. Not banned in sport.

Scientific references

Where to buy

Swanson Vitamins, Full Spectrum® Burdock Root, 100 Capsules (460 mg per Capsule)

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