HistoDAO™ is a patented enzyme formula containing diamine oxidase (DAO)—the main enzyme responsible for the degradation of ingested histamine. This enzyme has been clinically tested and found to break down food-derived histamine in the digestive tract. DAO is not absorbed and does not have systemic activity. HistDAO does not manage or address antibody-related or IgE-related food allergies.
Products purchased within 30 days on the IHS webstore, or in-office, may be returned for office credit. Products must be unopened and in original packaging. Products purchased from other stores will NOT be returned. Products that were shipped are not returnable unless damaged.