Ask the doctor: Should I have my magnesium level checked?
Magnesium is absorbed in the intestine and travels through the blood to cells and tissues; any excess is excreted through the kidneys. About half of the magnesium we absorb is stored in bone; the other half, in cells throughout the body. Only a little is found in blood. As a result, the blood level of magnesium doesn't tell us much about the body's total store of the mineral.
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