MAGNESIUM OXIDE, LIGHT POWDER, USP, also known as magnesia, is a white solid mineral that is hygroscopic and can be found in it natural form as periclase. It has many uses, but from a pharmaceutical perspective it is used primarily as a mineral supplement and a tablet and capsule diluent. Spectrum Chemical manufactured USP products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP) per 21CFR part 211 in FDA registered and inspected facilities.