Feverfew extract is standardized to 0.7% parthenolide.

Parthenolide is the herb's key active which has been clinically studied.

Ingredients: Feverfew (leaf) 325 mg, Feverfew extract (leaf) 0.7% Parthenolide 90 mg

Other Ingredients: Gelatin (capsule)

Precautions
Not recommended for use by pregnant or lactating women, or by children under two years of age. Certain individuals may experience oral or gastric irritation with use. If irritation occurs discontinue use immediately.