Daosin is a food supplement for the dietary management of dao deficiency (histamine intolerance). The DiAminoOxidase contained in DAOSIN complements the body's own enzyme, which is responsible for metabolizing histamine. Taking one DAOSIN capsule before each meal increases the amount of DAO in the small intestine and, therefore, the ability to break down histamine. This accelerates the processing in the digestive tract of the histamine present in food, which is the trigger of the symptoms.