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Safety Issues
Comprehensive safety studies of yellow dock have not been performed, and for this reason it should not be used by pregnant or nursing women, young children, or individuals with severe liver or kidney disease.
As with any stimulant laxative, yellow dock should not be used if there is an intestinal obstruction. Possible side effects of overuse include cramps, diarrhea, nausea, intestinal dependence on the laxative, and excessive loss of potassium . 1 In addition, yellow dock (like spinach) contains oxalic acid. Consuming excessive quantities of oxalic acid can cause severe toxic symptoms including vomiting and abdominal pain, and, in extreme cases, kidney stones or kidney failure. One case of fatal yellow dock poisoning has been documented. 2 The victim, who had diabetes, ingested one kilogram of the raw herb in a salad, and died of liver and kidney failure. The liver failure was not explained.
References
- Newall CA, Anderson LA, Phillipson JD. Herbal Medicines: A Guide for Health-Care Professionals. London, UK: Pharmaceutical Press; 1996:274.
- Reig R, Sanz P, Blanche C, Fontarnau R, Dominguez A, Corbella J. Fatal poisoning by Rumex crispus (curled dock): pathological findings and application of scanning electron microscopy. Vet Hum Toxicol. 32(5):468-70.
