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Research on vitamin D status in Indian children has been confined to studies conducted on small samples from certain regions and using non-standard techniques to quantify 25(OH)D3. Vitamin D insufficiency was observed in this multicenter research that used a standardized technique to evaluate 25(OH)D3 concentrations from dried blood spots (DBS) in children and adolescents from 5 to 18 years old in India. This school-based cross-sectional observational research used a multi-stage stratified random sampling technique. We picked a city and its surrounding hamlet from six states in India, which span a lot of ground. Data was gathered on demographics, anthropometry, body composition, food intakes, and DBS samples. Liquid chromatography with tandem-mass spectrometry was used to evaluate 25(OH)D3 in DBS. A total of 2450 youngsters had their vitamin D level checked, with a subset (n = 672) having extra data obtained for the purpose of evaluating predictors. In the study, 36.8% of participants had adequate vitamin-D levels (> 50 nmol/L), with greater concentrations seen in rural respondents and boys (p < 0.05). The mean vitamin-D concentration was 45.8 ± 23.9 nmol/L. [ABSTRACT FROM AUTHOR]