In some embodiments, the oral dosage forms of the present invention is administered to a subject at a dose less than about 2 mg elemental magnesium/kg/day, less than about 4 mg elemental magnesium/kg/day, less than about 6 mg elemental magnesium/kg/day, less than about 8 mg elemental magnesium/kg/day, less than about 10 mg elemental magnesium/kg/day, or less than about 12 mg elemental magnesium/kg