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Abstract
This prospective cohort study screened fifty children and adolescents with T1D for vitamin D deficiency. 70% were found to have vitamin D deficiency and were tested for the effect of vitamin D supplementation- for 3 months- on their glycaemic control. They had significantly higher insulin requirements compared to those with normal vitamin D levels. Vitamin D deficiency significantly correlated with insulin requirements and with HbA₁c%. Vitamin D supplementation improved HbA₁c% significantly but this improvement was not sustained 3 months later. However, no significant change in insulin requirements