What is the difference between magnesium hydroxide and magnesium oxide?

Magnesium hydroxide and magnesium oxide are both compounds of magnesium, but they have different chemical structures and properties. Magnesium hydroxide has the chemical formula Mg(OH)2 and is a white solid that is commonly used as an antacid and laxative. Magnesium oxide, on the other hand, has the chemical formula MgO and is a white powder that is often used as a dietary supplement and in the production of refractory materials. The main difference between the two compounds is that magnesium hydroxide contains hydroxide ions (OH-) while magnesium oxide does not.