Feverfew ( Tanacetum parthenium ), a member of the sunflower family may prevent migrains, research shows that it can help by reducing the secretion of hormone serotonin, which is thought to cause the migrain attacks.
How to use this herb?
However, feverfew does not seem to affect migraines that have already started. Researchers used to think that a single compound found in feverfew was what helped migraine prevention.
Overall, these studies suggest that feverfew taken daily as dried leaf capsules may reduce the incidence of attacks in patients who experience long-term migraine headaches.
Source - Wiki, Natural Herbs Guide
Related Links - Migrain , Headache