New and updated guidelines on recommended vitamin D intake have been published this week in the online issue of the Canadian Medical Association Journal (CMAJ).
Dr. David Hanley, professor at the University of Calgary Faculty of Medicine, and member of Osteoporosis Canada's (OC) Scientific Advisory Council, is the lead author of the paper on behalf of Osteoporosis Canada.
To take above 2000 IU per day the paper recommends medical supervision.
The new guidelines recommend daily supplements of 400 to 1000 IU for adults under age 50 without osteoporosis or conditions affecting vitamin D absorption. For adults over 50, supplements of between 800 and 2000 IU are recommended.
"A daily supplement of 25 mcg (800 IU) should now be regarded as a minimum dose for adults with osteoporosis," writes Hanley with co-authors. "Canadians can safely take daily vitamin D supplements up to the current definition of tolerable upper intake level (50 mcg [2000 IU]), but doses above that require medical supervision."
Blood tests can help guide decisions on how much vitamin D is needed.
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