The goal of this clinical study is to learn whether vitamin D supplementation improves metabolic control in adults with type 2 diabetes mellitus who have vitamin D deficiency. The main questions it aims to answer are: Does vitamin D supplementation improve fasting glucose and glycated hemoglobin (HbA1c) levels in patients with type 2 diabetes and vitamin D deficiency? Does vitamin D supplementation increase serum vitamin D concentrations in these patients? Researchers will evaluate metabolic parameters before and after vitamin D supplementation to assess changes associated with correction of vitamin D deficiency. Participants will: Receive oral vitamin D supplementation (100,000 IU once monthly) for three months Have fasting glucose, HbA1c, body mass index (BMI), and serum vitamin D levels measured at baseline and after three months of supplementation.
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Change in glycated hemoglobin (HbA1c)
Timeframe: Baseline and 3 months