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SafetyDISCLAIMER: Many complementary techniques are practiced by healthcare professionals with formal training, in accordance with the standards of national organizations. However, this is not universally the case, and adverse effects are possible. Due to limited research, in some cases only limited safety information is available.
Allergy to burdock may occur in individuals with allergy to members of the Asteraceae/ Compositae family, including ragweed, chrysanthemums, marigolds, and daisies. Severe allergic reactions (anaphylaxis) have been associated with burdock. Allergic skin reactions have been associated with the use of burdock plasters on the skin. Caution should be used in patients with allergies or intolerance to pectin since certain parts of the burdock plant contains different levels of pectin complex.
Side Effects and Warnings
Based on traditional use, burdock is generally believed to be safe when taken by mouth in recommended doses for short periods of time. Handling the plant or using preparations on the skin (such as plasters) has occasionally been reported to cause allergic skin reactions. Diuretic effects (increasing urine flow) and estrogen- like effects have been reported with oral burdock use in patients with HIV. Although reports of symptoms such as dry mouth and slow heart rate have been noted in people taking burdock products, it is believed that contamination with belladonna may be responsible for these reactions. Contamination may occur during harvesting.
In theory, tannins present in burdock may be toxic, although toxicity has not been reported in animal studies. Tannins can cause stomach upset and in high concentrations may result in kidney or liver damage. Long- term use of tannins may increase the risk of head and neck cancers, although this has not been seen in humans. Based on animal research and limited human study, burdock may cause increases or reductions in blood sugar levels. Caution is advised in patients with diabetes or hypoglycemia, and in those taking drugs, herbs, or supplements that affect blood sugar. Blood sugar levels may need monitoring by a qualified healthcare provider, and medication adjustments might be necessary. In theory, burdock may also cause electrolyte imbalances (for example, changes in potassium or sodium levels in the blood) due to diuretic effects (increased urine flow).
Several case reports of burdock root tea poisoning exist along with cases of burdock ophthalmia (eye inflammation). There have been several reports of stomatitis (mouth sores) present in dogs that have come in contact with burdock, burs, and bristles.
Pregnancy & Breastfeeding
Based on animal studies that show components of burdock to cause uterus stimulation, burdock is sometimes recommended to be avoided during pregnancy. Due to limited scientific study, burdock cannot be considered safe during pregnancy or breastfeeding.