Feverfew(Tanacetum parthenium): Feverfew is an herbal remedy that dates back to Greco-Roman times. It was formerly employed as a remedy for difficulties associated with young women's menstrual cycles (the word parthenium is derived from the Greek word parthenos, meaning "virgin") and was later used in European herbalism to reduce fevers (the common name feverfew being a corruption of the Latin word febrifuga, an agent that lowers fevers).²⁹ Interest in this herb has been generated in the past ten years because of several clinical studies that have been published in British medical journals. Research shows that feverfew leaves not only bring relief in a significant number of migraine patients who have not responded positively to conventional medications, but also helps to prevent the onset of additional episodes.³⁰ Recently, the Canadian government's Health Protection Branch (equivalent to the United States' FDA) has approved feverfew leaf extract for migraine prevention, as long as the products contain a minimum of 0.2 percent parthenolide, a substance in the feverfew leaf that has been identified as being the primary active component.³¹ Early herbal literature also attributes anti-rheumatic properties to feverfew, but this has not been confirmed by twentieth century research.