Magnesium is an important mineral that plays a role in more than 300 enzyme reactions in the human body. Its many functions include aiding muscle and nerve function, regulating blood pressure, and supporting the immune system. An adult body contains about 25 grams (g) of magnesium, of which 50-60% is stored in the skeletal system. The rest is found in muscles, soft tissues and body fluids. Magnesium is one of the seven important macro minerals. These macrominerals are minerals that people need to get in relatively large amounts—at least 100 milligrams (mg) per day. Trace minerals, such as iron and zinc, are equally important, although humans need them in smaller amounts. Magnesium is important for many body functions. Getting enough of this metal can help prevent or treat chronic diseases, such as Alzheimer’s, type 2 diabetes, cardiovascular disease and migraines.