Feverfew extract is standardized to 0.7% parthenolide. Parthenolide is the herb's key active which has been clinically studied.
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.
*  Note: Unless otherwise noted, this product has not been evaluated by the Food and Drug Administration. Our natural products are not intended to diagnose, treat, cure, or prevent any disease.