Light Magnesium Oxide IP/BP/EP/USP is a white, crystalline powder with a slight odor of ammonia. It is an intermediate magnesium compound that is used in various pharmaceutical and industrial applications. It is used as an antacid, anti-foaming agent, binder, and filler in the manufacture of tablets and capsules. It is also used as a dietary supplement to reduce constipation, as a laxative and antacid, as a dietary supplement for people with magnesium deficiency, and for the treatment of heartburn and indigestion.