Burdock Root
EVIDENCE: WEAKAlso sold as: Arctium lappa, gobo, burdock extract, greater burdock
Burdock root contains antioxidant compounds, including arctiin and arctigenin. Human evidence is limited, with one small knee-osteoarthritis trial. Traditional descriptions such as blood purification do not correspond to an established measurable benefit.
Compiled by iSupplementReviews editorial team ·Updated 2026-10-06 · 3 sources
- Type
- Botanical root (traditional 'blood purifier')
- Studied dose
- No established dose; the OA tea trial used ~3 cups/day burdock tea; folk use 2–6 g/day dried root
- Best form
- Dried root or tea as eaten/brewed; unstandardized powders vary — arctiin is the marker compound
- Upper limit
- No established upper intake limit — food-level safe (it's a Japanese vegetable); concentrated extracts unstudied
- Our rating
- WEAK — Mostly small, animal, or traditional evidence
What is burdock root?
Burdock is the root of Arctium lappa, eaten as gobo in Japan and traditionally used in Western herbal medicine. It contains arctiin and arctigenin, compounds with laboratory antioxidant and anti-inflammatory activity. Traditional blood-purification claims are not established clinical outcomes.
What does the research show?
| Claim | Evidence | Dose studied | Verdict |
|---|---|---|---|
| Anti-inflammatory (joint OA) | One small trial, tea | ~3 cups/day | Small positive signal |
| Antioxidant | Lab work, animal | — | Mechanism only |
| ‘Blood purification’ | No testable outcome exists | — | Pre-scientific concept |
| Anticancer | laboratory activity; failed historical cancer formulas | — | Unproven — dangerous hype history |
| Oral/dental benefit | No data | — | Unproven |
What dose was studied?
The one human trial was a tea regimen: cups, not milligrams. There is no standardized dose, no accepted extract convention, and no human data below gram-level whole-root intake.
Side effects
Food-safe at culinary amounts. Daisy-family allergy applies. Historical adulteration with atropine-containing plants has caused real poisonings; the plant is safe, sketchy supply chains are not.
Drug interactions
- Diuretics/diabetes medications: mild diuretic and reported glucose effects can stack.
- Blood thinners: theoretical potentiation.
Who should not take it
Pregnant women at concentrated doses (traditional caution), daisy-family-allergic individuals, and anyone buying loose ‘detox’ teas from unverifiable sources; the adulteration history is the one real danger on file.
What the authorities say
MSKCC lists it as an herb with anticancer claims that are unsubstantiated, and notes its traditional ‘blood purifier’ framing without clinical support. No regulatory endorsement for anything.
What to know about burdock root
Burdock has very limited human supplement evidence, including one small joint trial. Its history as food and traditional medicine does not establish detoxification or blood-cleansing benefits.
Frequently asked questions about Burdock Root
Does burdock 'purify blood'?
No human evidence establishes blood-purifying effects. Burdock contains arctiin and arctigenin, which have antioxidant and anti-inflammatory activity in laboratory models. Those findings do not demonstrate blood cleansing in people.
Has burdock been tested in humans at all?
Barely. The most-cited trial gave knee osteoarthritis patients burdock root tea and reported improved inflammation markers and symptoms over ~6 weeks (n≈36). One small tea trial for joint inflammation is the summit of the clinical file.
Why is burdock in so many 'cleanse' formulas?
Because 'blood purifier' was the original detox claim; burdock anchored the famous Essiac and Hoxsey anticancer formulas, which is where its cleansing reputation comes from. That reputation is inherited folklore, and the anticancer claims specifically never held up.
Is burdock safe?
As food, completely; it's gobo, a staple root vegetable in Japan. As a concentrated supplement: ragweed-family allergy applies, and there's a real-world caution. Historically, burdock teas have been adulterated with belladonna compounds, so sourcing matters.
Why is it in a dental supplement?
No studied reason. It's a fixture of the 'detox stack': milk thistle, dandelion, burdock, yellow dock, a formula template about 'cleansing' that has no mechanistic connection to the mouth.