The main chemical constituents of feverfew are its volatile oil components, dominated by camphor and chrysanthenyl acetate, sesquiterpene lactones notably panthenolide and flavonoids.
Kosher Feverfew [Kof K] Pareve
Parthenolide, long thought to be the main active anti-migraine principle of feverfew leaf, has now been indicated to be irrelevant to that activity.