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The literature data and the finding of our studies on the analysis of the correlation between the level of parathyroid hormone and supply of vitamin D of children (n=107) of early age are presented in the article. The serum level of vitamin D in the analyzed group of children was 24.8 [17.6–32.5] ng/ml, the median of the parathyroid hormone was 21.0 [12.3–25.5] pg/ml. It has been established that children with optimal supply of vitamin D have significantly lower parathyroid hormone levels vs. the children with vitamin D insufficiency (25 (OH) D from 20 to 30 ng/ml) and deficiency (calcidiol values below 20 ng/ml). The correlation between the level of vitamin D and parathyroid hormone was r=-0.18, p=0.035. The best supply of vitamin D was found in children of the first year of life – 25 (OH) D concentration was 29.95 [16.2–40.3] ng/ml. The parathyroid hormone level (16.5 [10.7–23.8] pg/ml) in these children was reliably lower (p=0.05) vs. the children of the second and third years of life. A positive correlation was established between the age of patients and the parathyroid hormone level (r=0.2, p=0.05). Preventive doses of vitamin D were received by 42.1% of children. The blood serum concentration of 25 (OH) D in them was higher (32.7 ng/ml), and the parathyroid hormone level was significantly lower (14.9 pg/ml) vs. the children who did not receive cholecalciferol preparations (p

The study estimated vitamin D provision for babies in relation to the type of their feeding and the efficiency of drug donations of cholecalciferol preparations. A total of 132 babies aged 1 to 12 months were examined. Vitamin D deficiency was shown to occur in more than half (58.3%) of the babies at the solar minimum. If hypovitaminosis D was not prevented using drugs, the serum 25(OH)D level in the breastfed babies was 8.7 (6.3-14.8) ng/ml, which was significantly lower than that in formula-fed ones [24.55 (19.0-32.0) ng/ml] (p=0.00002). Cholecalciferol taken by the infants in a preventive dose of 500-1500 IU/day substantially increased their provision with vitamin D from 19.8 (10.4–26.3) to 32.7 (24.5-45.7) ng/ml (p=0.0000007), regardless of the feeding pattern. The serum calcidiol level is closely correlated with the dose of cholecalciferol (r=0.57; p