Vitamin D and bone health in children, an unlikely beneficial effect according to a meta-analysis nevertheless a claim is accepted, paradox?

A systematic review and meta-analysis carried out to determine the effectiveness of vitamin D supplementation for improving bone mineral density in children and adolescents concluded that it is unlikely that vitamin D supplements are beneficial in children and adolescents with normal vitamin D levels. Nevertheless, according to EFSA a cause and effect relationship has been established between the intake of vitamin D and normal growth and development of bone in children and adolescents.

Reference: Winzenberg T, Powell S, Shaw KA, Jones G. Effects of vitamin D supplementation on bone density in healthy children: systematic review and meta-analysis. BMJ. 2011 Jan 25;342:c7254

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