Immunity Defence acts as a natural histamine blocker. The active ingredient is a unique bioactive derived from quail eggs called ovomucoids, a glycoprotein known as a trypsin inhibitor of the serine protease family. It works by preventing allergens from activating the immune cells, this blocks the release of histamine, the molecule which causes the allergy symptoms so many of us will recognise - runny nose, itchy eyes, and sneezing. China & Japan have been successfully using quail eggs to treat seasonal allergies & inflammatory diseases for centuries.