The Magnesium Oxide is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It is used as a supplement to maintain adequate magnesium in the body. It contains more magnesium than other magnesium supplements and is often used to prevent or reverse magnesium deficiency. It is used extensively in the soil and groundwater remediation, wastewater treatment and drinking water treatment. The Magnesium Oxide is very efficient and useful.