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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