Magnesium oxide is useless.
*magnesium citrate is four times more effective at raising serum magnesium levels compared to magnesium oxide.
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*Magnesium oxide is a salt that combines magnesium and oxygen.
It naturally forms a white, powdery substance and may be sold in powder or capsule form.
This type isn’t typically used to prevent or treat magnesium deficiencies, as some studies report that it’s poorly absorbed by your digestive tract (7Trusted Source).
Instead, people use it more frequently to relieve uncomfortable digestive symptoms, such as heartburn, indigestion, and constipation. Some may also use it to treat and prevent migraine episodes, but more research is needed to confirm that magnesium deficiency can contribute to migraine at tacks
