DAO Histamine Digester contains diamine oxidase (DAO), an intestinal enzyme that digests histamine.* The body produces DAO to digest excess food-derived histamine in the lower intestine.* The formula is enhanced with rutin and quercetin.* Suggested use: As a dietary supplement, 1 or 2 capsules daily with histamine-rich foods, or as directed by a healthcare professional. Caution: If pregnant or nursing, consult your healthcare practitioner before use. Keep out of reach of children.