Adults need 310 to 420 mg/ day.
Children need 130 to 240 mg/day.
Magnesium is needed for bone, protein, making new cells, activating B vitamins, relaxing nerves and muscles, clotting blood, and in energy production.
Insulin secretion and function also requires magnesium. Magnesium also assists in the absorption of calcium, vitamin C and potassium.
Deficiency may result in fatigue, nervousness, insomnia, heart problems, high blood pressure, osteoporosis, muscle weakness and cramps.