. . 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
US Cities with least amount of sunshine - top 15 all in Washington
4700 IU of vitamin D needed by most seniors – an equation -July 2014
Proof that Vitamin D Works 47 proofs as of May 2014
HMOs will save millions of dollars with vitamin D but Group Health HMO does not seem to be aware of the return on investment with Vitamin D
VA showed increased vitamin D associated with lower health costs - Lancet May 2012