Magnesium sulfate or magnesium sulphate is a chemical compound, a salt with the formula MgSO₄, consisting of magnesium cations Mg²⁺ and sulfate anions SO2−4. Magnesium sulfate is a crystalline solid that has a white appearance and is odorless. It is a white crystalline solid, soluble in water but not in ethanol.

Magnesium Sulfate is a prescription medicine used to treat the symptoms of low levels of magnesium (Hypomagnesemia), to prevent seizures in pregnant women with conditions such as pre-eclampsia, eclampsia and Toxemia of Pregnancy. Magnesium Sulfate may be used alone or with other medications.Magnesium sulfate is one of the food additives, when cooking will be appropriate to add MSG, MSG or often drink in the beverage, and mineral water will be appropriate to add magnesium sulfate