Fans of our butterbur will rejoice in this new version, which replaces branded supplements with equally high quality at a much lower price. Many users asked us for a lower-cost alternative, and after much searching, we were able to find an extract similar in composition and equal in potency, which we feel confident will produce the results you've come to expect from Swanson brand supplements. Each capsule supplies 75 mg of butterbur extract standardized to a guaranteed 15% petasins and certified free of pyrrolizidine alkaloids (PAs).