Because histamine build-up can occur as a result of deficient DAO (diamine oxidase) levels, it’s important that you support your DAO levels in order to clear histamine from your body. In addition to eating foods high in DAO co-factors like saturated fats, omega-3 fats, minerals, and B-vitamins, you can try taking a DAO supplement. Avoid DAO-blocking foods like caffeinated beverages and alcohol. And, you might want to consider following a low histamine diet, avoiding environmental allergens, and focusing on gut healing to address the root cause of your histamine build-up.