FeverFew-Power (For Migraines, fever, aches and pains) by Nature's Herbs Helps maintain normal blood vessel tone. Studies at the London Migraine Clinic have increased interest in the parthenolide in Feverfew. Feverfew helps maintain normal blood vessel tone and normalize the function of platelets in the blood system by inhibiting platelet aggregation, reducing serotonin release from platelets and blocking the formation of pro-inflammatory mediators. Take one per day to help prevent the onset of a migraine headache. Do not use if pregnant or nursing. Item # 042-730...60 Softgels.Certified Potency...100 mcg Sesquitepene lactones per capsules