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Vitamin D improves bone health
Doctors wanted to test the effects of different doses of vitamin D on bone mineral density. In this study, 265 postmenopausal women aged 60 to 70 took a placebo, 400 IU, or 1,000 IU of vitamin D per day. After one year, vitamin D levels had declined by 11 percent for placebo, increased 94 percent in the low-dose vitamin D group, and increased 129 percent in the high-dose vitamin D group.
 
Only the high-dose vitamin D group saw a benefit in bone mineral density, which declined by 0.05 percent, compared to 0.57 for the low-dose vitamin D group and 0.60 for placebo. One month after the study ended, vitamin D levels continued to decline in all groups, but remained in the normal range for those who had taken vitamin D.

Reference: JBMR; Vol 28, No 10, 2202–2213, Oct 2013.
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