Do you take metformin for treatment of your diabetes? If so, did you know that metformin use can affect your vitamin B12 levels? Metformin is a very common medication used to treat Vitamin B12 Side Effects: Risks of Excess Intake How Quickly Does B12 Shot Work? Does It Help to Lose Weight? Can Vitamin B12 Cause Diarrhea or Make You Poop More? Performance Lab Infubion (Cyanocobalamin Inj) Effective Treatment for Vitamin B12 Deficiency at Best Price Who Needs Vitamin B12 Shots? Exploring Indications And Reasons For B12 Injections