Vitamin D deficiency and risk of premature death!

The evidence does seem to be stacking up here. This study is one of the first to look at the effect of low levels of this hormone on a variety of risk factors, not just bone density issues. It does seem that for normal size adults living in offices, or 'darker' climates, supplementation in the range of 2,000 to 4,000 IU per day is both safe and sensible.