Submitted by Jim K on Fri, 2008-10-31 07:44

The charts alone make it crystal clear: lack of sun exposure, low D levels and a host of diseases result. Critical for all of us living in northern climates, but especially true for people of African descent with dark skin. It's apparent from his presentation that even 2000 units a day is not enough for the elderly, African Americans, and those of us with illness. 4000 units a day is more like it.