Petadolex is used since 1972 and contains the same trusted effective ingredient of butterbur extract recommended by the Canadian Headache Society for headache prevention; no serious side effects have been reported. Petadolex Capsules are made according to stringent German standards for dietary supplements and are guaranteed to contain at least 15% Pet (the herb’s active ingredient); making Petadolex the preferred choice of neurologists. In independent Clinical Study to outline efficacy, 71% adult headache sufferers taking 50 mg of Petadolex twice daily had reduced headache pain by at least 50%. Thanks to its patented manufacturing process, this purified herbal headache supplement contains no detectable pyrrolizidine alkaloids (PAs) that may harm the liver. Feel comfortable using Petadolex without worry. Ready for Relief? Headache prevention treatments do not have to cost $ thousands a year or expose you to risk of serious side effects associated with prescription medications. Since 1972, Petadolex has been using its patented extraction process to create an affordable, safe and effective option; Well-tolerated: especially by children (use our 50mg option).