Yellow Dock
Also known as: Rumex crispus, curly dock, sour dock, narrow-leaved dock
Effective Dosage
No established dose
What the Science Says
Yellow dock is a flowering plant (Rumex crispus) used for centuries in traditional herbal medicine, often promoted for digestive support, liver health, and as a source of iron. One lab study found that an extract of its fruit showed antioxidant activity in test tubes and in rats exposed to a liver toxin, suggesting some protective potential. However, there are no human clinical trials supporting any health benefit, and the only published human case report documents a serious safety concern — a dangerous drop in blood platelets linked to yellow dock herbal tea consumption.
What It Doesn't Do
Not proven to detox your liver in humans. No clinical evidence it treats iron deficiency or anemia. Won't reliably improve digestion based on current research. The antioxidant results are from lab and animal studies only — not human trials. 'Traditional use' is not the same as proven effectiveness.
Evidence-Based Benefits
Yellow dock is a flowering plant (Rumex crispus) used for centuries in traditional herbal medicine, often promoted for digestive support, liver health, and as a source of iron. One lab study found that an extract of its fruit showed antioxidant activity in test tubes and in rats exposed to a liver toxin, suggesting some protective potential. However, there are no human clinical trials supporting any health benefit, and the only published human case report documents a serious safety concern — a dangerous drop in blood platelets linked to yellow dock herbal tea consumption.
Weak EvidenceEffective at: No established dose
Source: auto-research
Absorption & Bioavailability
Unknown — no human pharmacokinetic studies available from the provided research
Red Flags to Watch For
- Linked to immune thrombocytopenia (dangerously low platelet count) in a published case report — a potentially life-threatening bleeding disorder
- Zero human clinical trials exist to support any claimed health benefit
- Widely sold in over 1,000 registered supplement products despite almost no safety or efficacy data in humans
- Contains oxalates and anthraquinones, which can be harmful in high doses or with prolonged use
- May interact with blood thinners or medications affecting platelet function — consult a doctor before use
Products Containing Yellow Dock
See how Yellow Dock is used in these analyzed products:
Research Sources
- General knowledge
- Limited published research available
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-09