Comparison of the absorption of magnesium citrate and magnesium oxide in healthy subjects.

INTERVENTION: 20 healthy male subjects are randomized to receive an oral single‐dose of magnesium citrate (equivalent to 300 mg magnesium) or magnesium oxide (equivalent to 300 mg magnesium) in a cross‐over design with a 3 day wash‐out period under supervision of the investigators. CONDITION: Absorption of magnesium. PRIMARY OUTCOME: Amount of magnesium excreted into the urine. ; SECONDARY OUTCOME: Magnesium concentration in erythrocytes (explorative evaluation). Magnesium concentration in monocytes/lymphocytes (explorative evaluation). Magnesium concentration in serum (explorative evaluation). INCLUSION CRITERIA: Male Caucasians aged between 18 and 45 years (including) in general good physical health and normal weight with normal renal function.