Item Description by Weber & WeberPetadolex's doctor-preferred formulation is at least 15% Petasin herbal extract with zero detectable pyrrolizidine alkaloids that can damage the liver – it's PA-freeNo harmful side effects, no known drug interactions*Product InfoServing Size: 1 capsuleServings: 50Petasin and Isopetasin 7.5 mg(50 mg Purple Butterbur root extract, standardized to at least 15%)Other Ingredients: Medium-chain triglycerides, Gelatin, Glycerol, Sorbitol, Riboflavin (color)Suggested UseAdults take 1 capsule 3 times daily with meals for 4 weeks. Thereafter, 1 capsule twice daily for 3 months. If necessary increase to 1 capsule 3 times daily. Children ages 10 to 12 years old take 1 capsule daily with meals for 4 months, or as directed by a health care professional. Warnings & CautionsIf you are pregnant or nursing a baby do not use this product. Petadolex is contraindicated in pregnancy or liver disease.