We summarize the key findings, strength of the evidence, and research needs identified in
the National Institutes of Health conference “Vitamin D and Health in the 21st Century: an
Update,” which was held in September 2007; a systematic evidence-based review; and a
National Institutes of Health roundtable discussion held after the conference by scientists
with relevant expertise. The evidence-based review addressed 5 questions on 25-
hydroxyvitamin D [25 (OH) D] and functional outcomes across the life cycle and response to …