* Standardized Feverfew Complex * Herbal Supplement * Formulated by Michael Tierra L.Ac, O.M.D Planetary Herbals Feverfew Head Aid unites standardized extracts of feverfew and willow bark with Chinese classics, such as schizonepeta and notopterygium. The botanicals in Feverfew Head Aid represent a superb blending of modern European science with traditional Chinese herbalism.