| http://www.w3.org/ns/prov#value | - Safety is a serious concern, because butterbur may contain a certain type of chemical, or an alkaloid, that has liver and kidney toxicity, may be cancer-causing, and may cause blood clots, says Dr. Bowser, who works at Narberth Allergy & Asthma in Narberth, PA. Bowser cautions that you cannot be completely sure what you are getting when purchasing a supplement.
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