Magnesium sulfate is an inorganic salt with the formula MgSO_. It exists as a white crystalline solid, commonly available in anhydrous form or as various hydrates (e.g., heptahydrate). The anhydrous form is highly hygroscopic. In industrial applications, anhydrous magnesium sulfate is widely used as a drying agent and desiccant for organic solvents due to its high affinity for water and chemical inertness. It also serves as a coagulant in the production of tofu, a filler in paper manufacturing, and a component in fertilizers to correct magnesium deficiencies in soil. In the pharmaceutical and personal care sectors, it functions as an osmotic laxative, an anticonvulsant (magnesium sulfate injection), and a key ingredient in bath salts and Epsom salts for muscle relaxation. As a pharmaceutical excipient, it is used as a tonicity adjuster in parenteral formulations. The compound is generally recognized as safe (GRAS) by the FDA for food and pharmaceutical use. It is highly soluble in water, producing a neutral solution. Safety considerations include potential irritation upon prolonged skin contact and the risk of dehydration when handling the anhydrous form. Its low cost and high efficacy make it a staple in both laboratory and industrial settings.