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镁是仅次于钠、钾、钙而居第四位的人体最常见阳离子,在细胞内阳离子浓度中居第二位。成人全身约含镁25克(1000毫摩),其中50～60%都在骨内。正常血清中镁含量是1.6～2.1毫当量/升,其中约1/4～1/3是与蛋白结合的。美国人一般膳食中约含镁500毫克(20毫摩),很多都来自叶绿素。成人估计需由膳食摄入镁0.15毫摩(3.5～4.5毫克)/公斤/日,才能保持正平衡。儿童需镁更多。镁在小肠主动吸收,1,25-二羟胆钙化醇
Magnesium is the fourth most common cation in human body after sodium, potassium and calcium, ranking second in the intracellular cation concentration. Adult body contains about 25 grams of magnesium (1000 millimolar), of which 50 to 60% are in the bone. Normal serum magnesium content is 1.6 ~ 2.1 milliequivalents / liter, of which about 1/4 ~ 1/3 is protein-bound. Americans generally dietary magnesium in about 500 mg (20 mmol), many are from chlorophyll. Adults are estimated to need a dietary intake of 0.15 millimoles (3.5 to 4.5 milligrams) of magnesium per kilogram per day to maintain a well-balanced balance. Children need magnesium more. Active absorption of magnesium in the small intestine, 1,25-dihydroxycholecalciferol