The active ingredient in Histamine Block, diamine oxidase (DAO), is an enzyme naturally present in the intestines that helps break down histamine and certain other amines. Histamine Block may help support tolerance of some amines other than just histamine, such as putrescine and cadaverine.*
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always talk to your doctor before considering the use of this product, especially if you have health conditions or diseases that need to be addressed.