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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