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A Stacy Wiegman, PharmD , Pharmacy, answered. The U.S. recommended daily allowance for magnesium depends on the individual. Adult men should get between 270 milligrams (mg) and 400 mg per day, while women only need around 300 mg, and children and adolescents need even less. Most people get enough magnesium from their diet.
How much vitamin D should adults take? According to the National Institutes of Health (NIH), the daily Adequate Intake (AI) for adults is 5 mcg (200 IU) daily for males, female, and pregnant/lactating women under the age of 50. People 50 to 70 years old should get 10 mcg daily (400 IU) daily, and those over 70 should get 15 mcg daily (600 IU). Based on recent research, Dr. Weil recommends 2,000 IU of vitamin D per day. Look for supplements that provide D3 (cholecalciferol) rather than D2 (ergocalciferol).