INS and diabetes mellitus: Mechanism through which vitamin D can influence metabolism of glucose in patients with diabetes comprises of improvement in insulin sensitivity and β‐cell survival, amplified secretion of insulin from pancreatic β‐cells, calcium flux regulation for normalizing glucose tolerance, and β‐cell protection against cytokine‐induced apoptosis.4 Another study conducted by Ahmadieh et al in 136 diabetic patients demonstrated that serum 25‐OHD is negatively correlated with HbA1c.51