Preventa Migraine contains zero common allergens such as trans fat, peanuts, eggs, milk, wheat, gluten, tree nuts, fish, or shellfish. Preventa Migraine does contain Butterbur and Feverfew and should not be used by people with an allergy to Butterbur or Feverfew. If you know your stomach is easily upset, make sure to take Preventa Migraine with food. If when taking Preventa Migraine you experience persistent upper right abdominal pain, nausea, vomiting or jaundice, you may be experiencing an allergic reaction to Butterbur. Stop taking Preventa Migraine and immediately consult a physician.