Magnesium hydroxide is widely used as an antacid to neutralize stomach acid and provide relief from conditions like heartburn, indigestion, and upset stomach. It works by reacting with hydrochloric acid in the stomach to form water and magnesium chloride, reducing acidity.

In the medical field, it is also employed as a laxative to relieve constipation. It draws water into the intestines, softening stool and promoting bowel movements.

In industrial applications, it serves as a flame retardant in plastics, rubber, and textiles. When exposed to high temperatures, it decomposes to release water, which helps cool the material and dilute flammable gases, reducing the risk of fire.

Additionally, it is used in wastewater treatment to adjust pH levels and remove heavy metals by precipitating them as hydroxides.

In the food industry, it acts as a pH regulator and an additive in products like canned vegetables to maintain texture and color.

In personal care products, such as toothpaste, it functions as a mild abrasive to aid in cleaning teeth and removing plaque.

Its versatility makes it valuable across healthcare, industrial, environmental, and personal care sectors.