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Magnesium oxide (Mg O), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg 2+ ions and O 2− ions held together by ionic bonding .
Magnesium is absorbed orally at about 30% bioavailability from any water soluble salt, such as magnesium chloride or magnesium citrate. The citrate is the least expensive soluble (high bioavailability) oral magnesium salt available in supplements, with 100 mg and 200 mg magnesium typically contained per capsule, tablet or 50 mg/mL in solution. [26]
Adverse effects from magnesium occurring naturally in food have not been described. [3] However, excessive magnesium supplementation causes diarrhea — a side effect used by prescription as a laxative. [2] [3] Individuals with kidney disease have higher risk for adverse effects with magnesium supplementation. [2] [3] Excessive magnesium ...
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[3] Common side effects include low blood pressure, skin flushing, and low blood calcium. [1] Other side effects may include vomiting, muscle weakness, and decreased breathing. [4] While there is evidence that use during pregnancy may harm the baby, the benefits in certain conditions are greater than the risks. [5]
Magnesium oxide and other magnesium compounds are also used in the agricultural, chemical, and construction industries. Magnesium oxide from calcination is used as an electrical insulator in fire-resistant cables. [15] Other applications include: Magnesium hydride is under investigation as a way to store hydrogen.
Periclase is a magnesium mineral that occurs naturally in contact metamorphic rocks and is a major component of most basic refractory bricks. It is a cubic form of magnesium oxide (Mg O). In nature it usually forms a solid solution with wüstite (FeO) and is then referred to as ferropericlase or magnesiowüstite. [6]