Coltsfoot side effects
Used judiciously for short periods, coltsfoot should cause no problems; consult a qualified physician. But that view is not universally shared among herbal experts. The plant contains substances called pyrrolizidine alkaloids (PAs), which are toxic to the liver. The American Herbal Products Association recommends that all products containing PAs carry a statement warning that they are for external use only, should not be applied to broken or abraded skin, and should not be used when pregnant or while nursing. Ingesting 0.5 to 3.3 milligrams for every 2.2 pounds of body weight was found to be severely or fatally toxic. A standard cup of coltsfoot tea, containing 2 to 3 teaspoons of powdered leaves, provides a level of PAs (about 10 milligrams) that Germany's Commission E has deemed safe for occasional use.
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