Total distribution of magnesium (Mg) in the body. Mg (molecular weight, 24.305 D) is predominantly distributed in bone, muscle, and soft tissue. Total body Mg content is about 24 g (1 mol) per 70 kg. Mg in bone is adsorbed to the surface of hydroxy-apatite crystals, and only about one third is readily available as an exchangeable pool. Only about 1% of the total body Mg is in the serum and interstitial fluid [1,2,8,9,11,12].

*data typical for a 70 kg adult

Intracellular magnesium (Mg)

Intracellular magnesium (Mg)

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