Vitamin D supplementation had no statistically significant effects on total body bone mineral content or on bone mineral density of the hip or forearm .
It is unlikely that vitamin D supplements are beneficial in children and adolescents with normal vitamin D levels .
OBJECTIVE To determine the effectiveness of vitamin D supplementation for improving  bone mineral density in children and adolescents and if effects vary with factors such as vitamin D dose and vitamin D status .
Double Blind Study on the Need for Vitamin D Supplementation in Prepubertal Children
ABSTRACT . Fifty‐one healthy prepubertal schoolchildren were followed for 13 months in a double blind study . Twenty‐four of them were supplemented with 400 IU of vitamin D2 5–7 times weekly , while 27 received a placebo . The children were examined in winter both at the beginning and at the end of the study , and in the middle of the study in autumn . Mean 25‐hydroxyvitamin D levels in the supplemented group were significantly higher than those in the placebo group both in autumn and in winter , when the study ended . The vitamin D supplementation did not , however , affect other vitamin D metabolites , serum calcium , albumin , inorganic phosphorus , parathyroid hormone concentrations or alkaline phosphatase activity . Moreover , the supplementation caused no alterations in the weight or height gain or bone mineral content of the distal radius of the children , and thus sub clinical rickets could not be shown
Vitamin D supplementation had no statistically significant effects on total body bone mineral content or on bone mineral density of the hip or forearm .
It is unlikely that vitamin D supplements are beneficial in children and adolescents with normal vitamin D levels .
OBJECTIVE To determine the effectiveness of vitamin D supplementation for improving  bone mineral density in children and adolescents and if effects vary with factors such as vitamin D dose and vitamin D status .