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butterbur webMD

Butterbur Plant

Butterbur and Migraine Warning From Web MD

PA-free butterbur products are POSSIBLY SAFE when taken by mouth appropriately and short term - up to 16 weeks. Butterbur products that contain pyrrolizidine alkaloids (PAs) are UNSAFE when taken by mouth or applied to broken skin. PAs can damage the liver, lungs, and blood circulation, and possibly cause cancer.
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