Magnesium Oxide Tablets, 400mg, 120ct (4 Pack)

What the brand says

Magnesium oxide is a mineral supplement used to treat or prevent low levels of magnesium in the blood. Magnesium is important for many systems in the body, but it is especially vital for healthy muscles and bones. Some people use magnesium oxide to relieve heartburn or indigestion. The supplement may also be used short-term as a laxative. The supplement is available over-the-counter (OTC) without a prescription.