Higher vitamin D doses may be needed to restore healthy levels in overweight blacks

I am a small Caucasian woman. When I started taking 1000 IUs a day, after a while I started feeling somewhat yucky. I cut back to 400, and the feeling went away. You have to pay attention to your individual needs.

http://www.eurekalert.org/pub_releases/2015-07/mcog-hvd070715.php

Public Release: 7-Jul-2015
Medical College of Georgia at Georgia Regents University

The current recommended minimum daily dose of vitamin D is not sufficient to restore healthy vitamin D levels in overweight or obese blacks, researchers report.

Rather, daily intake of more than three times the recommended minimum is needed to restore what is generally considered a healthy blood level of vitamin D, said Dr. Yanbin Dong, geneticist and cardiologist at the Georgia Prevention Institute at the Medical College of Georgia at Georgia Regents University.

Overweight blacks are at increased risk for vitamin D deficiency because darker skin absorbs less sunlight - the skin makes vitamin D in response to sun exposure - and fat tends to sequester vitamin D for no apparent purpose.

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The Institute of Medicine recommends a daily intake of 600 international units of vitamin D for most children and adults; 800 IUs for those age 70 and older. For adolescents and adults, they recommend 4,000 IUs as the upper daily limit; 2,000 was the previous upper limit.

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