Magnesium oxide

Studies in people

• Benefit

  Night leg cramps²

  In people, magnesium oxide monohydrate reduced how often and how long night leg cramps happened, and improved sleep.

• Benefit

  Kidney stone risk³

  In people, magnesium oxide lowered oxalate in urine, which matters for kidney stones, though less than magnesium citrate did.

• Benefit

  Bone strength in girls⁴

  In girls, taking magnesium oxide daily led to more bone buildup in the hip.

Study type not stated

• Open question

  Artery stiffness⁵

  Scientists do not yet know whether magnesium oxide affects artery stiffness, blood pressure or gut bacteria in people.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least two findings in people. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.