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).
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