From the Manufacturer:
Provides dietary support to help maintain well-being. Each capsule contains 380 mg of Feverfew herb extract standardized to provide a minimum of 0.2% Parthenolides = 0.76 mg.
Standardized herbs provide uniformity of a single plant chemical batch after batch. Each extract delivers a quantified and measurable level of the targeted active ingredient in every serving. This active ingredient is considered by science to be the key ingredient responsible for the herb’s health benefits.