Results: At the end of the study, in the intervention group, the mean serum 25 (OH) D concentration was 133.01± 55.83 nmol / l, increased by 83.95 ± 55.32 nmol / l compared to before intervention (p<0.001), higher than the control group (p<0.01). Vitamin D deficiency was 97.4% lower than before intervention (p<0.001), while there was no significant difference in the control group.