Magnesium absorption and metabolism

Magnesium is mostly absorbed in the small intestine. In a normal person, around 50 per cent of dietary magnesium taken is absorbed. However, this depends on the concentration in the diet, with a lower percentage absorbed from a high magnesium diet. Magnesium absorption requires an acidic stomach environment. Absorption is reduced by laxative abuse, infections and allergies. Foods low in protein or high in phosphorus can reduce magnesium absorption.

Magnesium absorptionOxalates, which are found in some green vegetables and phytates which are found in some grains, may form insoluble complexes with magnesium and prevent it from being absorbed. However, these foods are often high in magnesium which may compensate for the reduced absorption. Vitamin D promotes magnesium absorption. Some reports have suggested that magnesium and calcium compete for absorption but recent studies suggest that calcium does not affect magnesium absorption.

The kidney is the main regulator of blood concentration and total body content of magnesium. Excretion mainly occurs at night. High protein and high sugar diets may increase magnesium excretion.

 
 
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Other Minerals:

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Sodium
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Magnesium
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Molybdenum
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