Ital J Pediatr
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The appropriate dose of vitamin D supplementation in children is still debated. We calculated that the recommended dose of 600-1000 IU vitamin D3/day is not sufficient to reach a serum 25-hydroxyvitamin D (25-OH-D) level of at least 30 ng/ml (75 nmol/l) in north Italian children > 12 months. The aim of this study was to analyse the effect of seasonal supplementation with 1500 IU (=37.5 μg) vitamin D3/day. ⋯ DINOS gained the approval of Padova Ethics Committee (n. 3960/U16/2016).