The majority of Americans and Canadians are getting enough vitamin D and calcium to meet their needs, says a new report from the Institute of Medicine. Most people up to age 70 need no more than 600 international units, or IUs, of vitamin D per day, and those 71 and older may need as much as 800 IUs, the report finds. The amount of calcium needed ranges, based on age, from 700 to 1,300 milligrams per day...
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