0.7% Parthenolide + Brain Health Dietary Supplement Lab Verified Nutrition A Brighter Way Since 1973, we've scoured the globe for the highest quality ingredients, connecting you with the most efficacious supplements that help you live brighter and embrace the moments that matter most. Solaray MigraGard contains a guaranteed 2.8 mg (0.7%) parthenolide from Feverfew. Parthenolide is an ingredient unique to Feverfew flower and fruit that has been studied for its support of healthy blood vessel and brain function.