Butterbur (Petasites hybridus) is a native shrub of Europe, North America, & Asia that has been used by the herbalists for centuries. Modern scientific studies have demonstrated that Butterbur supports healthy blood flow to the brain & healthy neurological function. Petasins, the active constituents in Butterbur, have been shown to play a role in minimizing the frequency & severity of neurological discomfort triggered by bright lights & stress that occasionally occurs in healthy individuals.