• Is butterbur an effective herbal therapy to prevent migraine? 

    Dodson, David; Khan, Mohammed; Moty, Ayham (Family Physicians Inquiries Network, 2009-11)
    Butterbur (Petasites hybridus) root extract appears to reduce the frequency of migraine headaches. The appropriate dose for optimal clinical effect is unclear. (SOR B, based on heterogeneous randomized controlled trials.)