Yellow Dock Root
Rumex crispus
酸模
Pinyin: Suān Mó
Plant Family
Polygonaceae
Part Used
Root (also leaves - edible)
Origin
Europe, Asia; naturalized worldwide
Safety Level
Caution
Overview
Yellow dock is a common weed with a long history of use as a blood purifier, liver tonic, and digestive aid. The root gets its name from its bright yellow color, which comes from anthraquinone compounds. Yellow dock is widely used in Western herbalism for skin conditions, anemia, and liver support. The young leaves are also edible as a green vegetable.
Traditional Chinese Medicine Properties
Nature (四气)
cool
Flavors (五味)
bitter, sour
Meridians (归经)
liver, spleen, large intestine, blood
Health Benefits
Traditional Uses
- Blood purifier / alterative
- Liver tonic and bile stimulant
- Skin conditions: acne, eczema, psoriasis, rashes
- Anemia (high iron content)
- Constipation (mild laxative)
- Digestive tonic and bitters
- Rheumatism and gout
- Scurvy (high vitamin C)
Active Constituents
The key compounds responsible for this herb's therapeutic effects:
Usage & Dosage
How to Use
Decoction (root), tincture, syrup, capsule, powder. Leaves eaten as cooked greens (to reduce oxalates).
Suggested Dosage
Decoction: 1–2 tsp dried root per cup, simmer 10–15 min, 2–3x/day; tincture: 2–3 mL 2–3x/day; capsules: 500 mg 2–3x/day. For acute constipation: stronger dose. For blood purification/liver: regular use at lower doses.
Quality & Storage
Harvest Season
Root is harvested in autumn (September–October) after first year, or early spring before new growth. Roots from 2–3 year old plants are most potent. Wear gloves when harvesting as leaves can cause skin irritation. Leaves are harvested in spring when young and tender.
Quality Indicators
Dried root: yellow to brown interior, twisted, with bitter, astringent taste. Should be firm and woody. The yellow color is from anthraquinone content. Organic is preferred as the plant absorbs heavy metals from soil. Avoid root that is too light or has mold. Quality can be tested by intensity of yellow color.
Storage
Dried root: airtight container in cool dark place, 2–3 years. Leaves: use fresh or dry for 1 year. Protect from moisture. Yellow dock root can become infested with insects if not properly stored.
Safety Information
Contraindications
Pregnancy (laxative/stimulant effect - avoid)Breastfeeding (may cause diarrhea in infant - avoid)Kidney disease or kidney stones (high oxalate content can worsen stones)Gout (oxalates may worsen - paradox: some use it for gout, but oxalate content is concerning)Inflammatory bowel disease (may worsen irritation)Children (not for long-term use)Electrolyte imbalances (long-term laxative use can deplete potassium)Do not use long-term continuously (2–4 weeks max, then take a break)
Possible Side Effects
- Mild laxative effect (expected at higher doses)
- Diarrhea and abdominal cramping (high doses)
- Nausea and vomiting (very high doses)
- Skin irritation from fresh plant (oxalate crystals)
- Kidney stone risk (high oxalate content - especially with raw leaves and long-term high-dose use)
- Electrolyte imbalance (long-term laxative abuse - potassium loss)
- Allergic reaction (rare)
- Discoloration of urine (yellow/red - harmless)
Drug Interactions
- Laxatives and stool softeners (additive effect)
- Blood thinners (anticoagulants) - may increase effect due to vitamin K content variability
- Diuretics (increased potassium loss)
- Heart medications (digoxin - potassium loss increases risk of toxicity)
- Antibiotics (may reduce absorption)
- Oral medications (may speed transit time and reduce absorption)
- Moderate interaction potential
Note: Always consult with a qualified healthcare practitioner before starting any herbal supplement, especially if you are pregnant, nursing, have medical conditions, or take medications.
References & Research
Information on this page is based on traditional herbal knowledge and modern scientific research. For a comprehensive list of references, please refer to our full citations page.
ℹ️ Disclaimer
This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. The FDA has not evaluated these statements. Always consult a qualified healthcare provider before using herbal supplements.
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