EFFECTIVENESS OF CORRECTION OF HYPOVITAMINOSIS D IN ADOLESCENTS LIVING IN MOSCOW CITY

Schoolchildren and their state of health, in particular, deficiencies, deserve no less attention than children of early age, while the recognition of the existence of inadequate vitamin D sufficiency in children of all age groups has not yet led to the introduction of mass prophylaxis for hypovitaminosis D. There are a number of factors determining the concentration of 25(OH)D-calcidiol in the blood. However, it is obvious that among many factors one should focus on several most significant and develop a scheme for correcting deficiency in each region.
Purpose: to assess vitamin D sufficiency in adolescents living in Moscow, to correct calcidiol status in adolescents on the basis of baseline concentration of the metabolite transported in the blood. Material and methods: 769 adolescents aged 11-18 years for whom 25(OH)D concentration in the blood was evaluated, then 218 patients were randomized into 2 groups: the study group received tableted dietary supplement Minisun® vitamin D3, the control
group received placebo. The dosage of cholecalciferol was defined based on the initial level of calcidiol in patients. The study continued for 6 months, then blood was re-sampled to determine the level of calcidiol.
Results: the study found low sufficiency with calcidiol among the schoolchildren: 25(OH)D median was 16.3 [11.4-20.8] ng/ml, only 5.2% of patients had normal concentration of calcidiol in the blood. At the second examination, positively significant differences in the status of vitamin D were observed in the study compared to the control group, while patients in the study group,
against a background of cholecalciferol donation, demonstrated 25(OH)D median increase from 16.2 [12.25-19.3] ng/ml to 24.2 [21.05-26.4] ng/ml (p <0.001) .
Conclusions: a large proportion of the child population (70.6%) have a concentration of 25(OH)D <20 ng/ml. The doses of cholecalciferol used in the study make it possible to eliminate the deficiency of calcidiol and to overcome the threshold of 20 ng/ml, but in order to normalize vitamin D status in the blood of adolescents living in Moscow, it is necessary to use higher dosages that need to be confirmed by further research.

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