IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-13-1-54234 Original Research Paper A Study On Vitamin B12 Deficiency In Chronic Metformin Therapy In Type 2 Diabetes Mellitus Patients Hemant Chaudhary Dr. Dr. Gaurav Vyas Dr. January 2024 13 1 01 02