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Re:What Do You Lack? Probably Vitamin D by adammichaelc on Tuesday July 27, 2010 @12:16PM (#1551696)
A quick google search found this:

http://www.google.com/search?q=%223-6+times%22+%22vitamin+d%...

My battery is about to die in the iPhone, so I don't have time to curate the list, but from a quick glance a couple of the sources from the google search look credible.

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