INS and type 1 diabetes mellitus: To address this unmet need, we planned a randomized controlled trial with the following objectives: 1) to evaluate the effect of adding Metformin as an adjunct to standard insulin therapy for 9 months in Indian adolescents with T1D on glycemic control, insulin sensitivity and cardiometabolic parameters (primary objectives) 2) to assess the impact of Metformin on anthropometry and body composition parameters (secondary objectives).