The main objective of the current proposal is to study the effect of increasing doses of vitamin D3 in a group of young women with hypovitaminosis D (serum 25OHD 20 ng/ml) and an adequate calcium intake of 1200 -1400mg/day. This is a double blind randomized placebo controlled study .There will be 5 treatment arms, four vitamin D3 dose groups ,400, 800, 1600, and 2400 IU/day and placebo .Calcium citrate tablets ...
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