How long should I take Histamine Digest before my histamines activity returns?Updated a month ago

Histamine Digest contains DAO, which is designed to act on histamine contained in foods while they are still in the digestive tract. The DAO does not have systemic activity and will only be active in the digestive tract for a short time after consumption. It will only stay in the system until it is excreted, the same as food waste. Histamine Digest is not intended to increase the body's production of DAO.†

†These statements have not been evaluated by the Food and Drug Administration (FDA). This product is not intended to diagnose, treat, cure, or prevent any disease.