Magnesium Hydroxide, Powder, USP is an inorganic compound that has a cloudy milk like appearance when mixed with water. Most commonly used as an antacid to counter the undesirable affects of stomach acids and is also used as laxative. It is also used commercially in many deodorants as an antiperspirant agent. Spectrum Chemical USP products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP) per 21CFR part 211 in FDA registered and inspected facilities.