Neurologist-recommended Petadolex Pro-Active contains pure butterbur extract to support healthy blood vessel tone in the head, as well as normal blood flow in the brain.The exclusive, patented processing (U.S. Patent #6,551,626) used to create Petadolex Pro-Active removes toxins naturally present in butterbur, making it the ONLY safe form available.For soothing comfort that improves with continued use, trust Petadolex Pro-Active for your entire family-it's clinically studied to be well tolerated, produces no significant adverse effects and is effective in both adults and children!