WebMD Answers
The Institute of Medicine set the following recommendations for vitamin D:
Ages 1-70: 600 international units (IUs) per day. Older than 71: 800 IUs. The IOM previously said 200 IUs was adequate for people aged 50 and younger, 400 IU for people aged 51-70, and 600 IUs for people older than 70.
The tolerable upper limit (UL) is 4,000 IUs for ages 9 and above (up from 2,000 IU in the IOM's previous guidance).
The IOM's calcium recommendations, based on age, range from 700 to 1,300 milligrams (mg) daily with a tolerable upper limit range of 1,000-3,000 mg.
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