Magnesium Balance

As is the case for calcium, most of the body's magnesium resides in bone. The normal intake of magnesium is on the order of 300 mg/day, of which the gastrointestinal tract reabsorbs less than half. A greater fraction of the ingested amount is reabsorbed in magnesium depletion; a lesser fraction is reabsorbed when body magnesium stores are excessive. However, the mechanisms involved in this regulation are not fully understood.

The kidney must excrete an amount equivalent to the daily intake of Mg2+ by absorption from the intestine, or about 120 mg/day. Normally 5-20% of the filtered load of Mg2+ is excreted, but the amount excreted can

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