How much is magnesium oxide in each capsule?

Swanson Triple Magnesium Complex provides 400 mg of magnesium per capsule from three sources: magnesium oxide, magnesium glycinate, and magnesium citrate. However, the label does not specify the exact amount of magnesium oxide alone in each capsule.The total 400 mg represents the combined magnesium content from all three forms. Take one vegan capsule daily with food and water as directed on the label. Consult your healthcare provider if you are pregnant, nursing, or have any medical conditions.