Magnesium oxide: Compared to other forms of magnesium, magnesium oxide is the least absorbable form and more likely to cause gastrointestinal side effects. Due to its laxative effect, it is often ...

DEAR DR. ROACH: Thank you for your recent column on kidney stones. Regarding kidney stones, do you have any opinion about the evidence that magnesium oxide can prevent or slow down kidney stone ...

Magnesium oxide is absorbed at very low rates in humans. A 2017 study found that rats only absorbed 15% of orally administered magnesium oxide; they excreted the rest.

Studies suggest that magnesium ions provided by magnesium oxide interrupt the brain signals that may cause migraine. A dose of 400–500 milligrams per day may be required to be effective.

Magnesium oxide is one of the most common and least expensive forms of magnesium for constipation. But there are others, including magnesium citrate or magnesium sulfate (Epsom salts).

Symptoms of low magnesium include fatigue, loss of appetite, nausea, and more. Low magnesium is also linked to headaches. For this reason, magnesium oxide is sometimes used to treat and prevent ...