Last verified: 17 days ago
Yellow Dock
Also known as: Rumex crispus, Curly Dock, Narrow Dock, Sour Dock
Evidence under review. — Not yet rated
Traditional herb with antioxidant activity in lab tests, but no clinical trials and a documented safety risk.
-
What it does
Yellow dock is a flowering plant (Rumex crispus) used for centuries in traditional herbal medicine, primarily as a digestive tonic and mild laxative. Lab studies on its fruit extract show...
-
Evidence quality
Evidence base hasn't been formally rated yet. See research below.
-
Clinical dose
No established dose
-
Found in
What the Science Says
Yellow dock is a flowering plant (Rumex crispus) used for centuries in traditional herbal medicine, primarily as a digestive tonic and mild laxative. Lab studies on its fruit extract show antioxidant activity comparable to some synthetic antioxidants, and animal studies suggest it may help protect the liver from oxidative stress. However, no human clinical trials have tested these effects, so there is no established effective dose or confirmed benefit in people.
What It Doesn't Do
Not proven to detox your liver in humans — that's traditional use, not clinical fact. No evidence it treats anemia, despite common marketing claims. Won't reliably improve digestion based on clinical data. No proven anti-inflammatory effect in people.
Evidence-Based Benefits
Yellow dock fruit extract shows antioxidant activity in lab tests, comparable to some synthetic antioxidants.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
In animal studies, yellow dock extract reduced liver oxidative stress caused by a toxic chemical.
Weak EvidenceEffective at: No established dose
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown — no human pharmacokinetic studies available in the provided research.
Red Flags to Watch For
- Documented case of herbal tea containing yellow dock causing immune thrombocytopenia (dangerously low platelets), a serious bleeding disorder
- Zero human clinical trials — all purported benefits are based on traditional use or animal/lab data only
- Widely sold in over 1,000 registered supplement products despite almost no clinical safety or efficacy data
- Contains oxalates, which can contribute to kidney stones with high or prolonged use
- May interact with blood thinners or medications affecting platelet function
Products Containing Yellow Dock
See how Yellow Dock is used in these analyzed products:
Frequently Asked Questions
What does Yellow Dock do?
Traditional herb with antioxidant activity in lab tests, but no clinical trials and a documented safety risk.
What is the effective dose of Yellow Dock?
No established dose
Is Yellow Dock safe?
Documented case of herbal tea containing yellow dock causing immune thrombocytopenia (dangerously low platelets), a serious bleeding disorder
What doesn't Yellow Dock do?
Not proven to detox your liver in humans — that's traditional use, not clinical fact.
Research Sources
- General knowledge
- PMID: 35402325
- PMID: 20623623
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25