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Adults only need 400-800 IU of vitamin D - Group Health HMO July 2014

What You Need to Know About Vitamin D

. . look for a daily supplement with 400 to 800 international units (IU) of vitamin D.
If you're over 65, aim for the higher end of this range.
Those in a higher risk group for low levels may need 2,000 units daily or even more.

And, Group Health Health Maintenance Organization (HMO) is in the Pacific Northwest of the United States

See also VitaminDWiki

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4700 IU of vitamin D needed by most seniors – an equation -July 2014
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