原文报道：
Osteoporosis Canada calls for big vitamin D rise
By Stephen Daniells, 13-Jul-2010Related topics: Industry
Adults under the age of 50 should be taking up to 1,000 International Units of vitamin D should, according to new guidelines from Osteoporosis Canada.
And people over 50 should be taking supplements up to 2,000 IU – the current ‘tolerable upper intake level’ – add the updated guidelines published in the Canadian Medical Association Journal.
Current Canadian recommendations are over a decade old and were not based on properly conducted dose-finding studies, says the journal.
“A daily supplement of 25 mg (800 IU) should now be regarded as a minimum dose for adults with osteoporosis,” states co-author Dr David Hanley from the University of Calgary Health Sciences Centre.
“Canadians can safely take daily vitamin D supplements up to the current definition of tolerable upper intake level (50 micrograms [2000 IU], but doses above that require medical supervision.”
The guidelines echo similar calls for the population to boost intakes of vitamin D. Typical recommended daily intakes (RDIs) lie between 200 and 600 international units (IU) per day while more and more science shows the above benefits can be better achieved with levels closer to 2000IU per day without safety concerns.
Some go much higher. One European study found daily doses between 2,000-3,000 IUs could reduce EU health care expenditures by €187bn ($250bn) each year.
