Efficacy of vitamin D supplementation on glycaemic control in type 2 diabetes: An updated systematic review and meta-analysis of randomized controlled trials

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This updated meta-analysis investigated the impact of vitamin D supplementation on glycaemic control in individuals with type 2 diabetes (T2D). By evaluating 39 randomised controlled trials (RCTs) involving 2982 participants, the study analysed key indicators, including fasting blood glucose, HbA1c, fasting insulin, and insulin resistance (HOMA-IR). The analysis explored variables such as dosage, duration, and patient characteristics at baseline to provide comprehensive insights into vitamin D as a complementary therapy for management of T2D.