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 .
Seasonal and geographical variations in the growth rate of infants in China receiving increasing dosages of vitamin D supplements.
In theory , sunshine exposure is sufficient to maintain normal vitamin D concentrations for the optimal growth of newborn infants . To determine whether season of birth , latitude ( north v. south ) and increasing dosages of vitamin D supplements would influence the growth rate for the first 6 months of life , 255 healthy fall- and spring-born infants from two northern and two southern cities in China were r and omly assigned to receive either 100 , 200 , or 400 IU of vitamin D a day . The study showed that season of birth and dose of vitamin D did not affect the growth rate of infants born in the same latitude , but a significant difference was found in the gain in length over the 6-month period between infants from the north and infants from the south ( P = 0.0001 ) . Regional differences among the Chinese people , other than sunshine exposure , may have influenced the difference in length gain
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 .