Description Our Feverfew is certified organically grown by Trout Lake Farm, Washington, and harvested at their peak natural potency of .2% parthenolide. It is the same strain of Feverfew used in the studies at the London Migraine clinic. Usage Feverfew helps maintain normal blood vessel tone. Recommended Daily Dosage As an addition to the daily diet, take one capsule three times daily, preferably with food. Best results are obtained with continuos use.