Why Do I Feel Worse After My B12 Injection? Understanding Post Injecti Oxford Origins Vitamin B12 is essential for your body's energy production, nerve function, and red blood cell formation. Unfortunately, many people don't realize that they may be lacking this crucial vitamin. If you're experiencing Bad Taste in Mouth: 15 Causes & Best Treatments to Try KWC Dental B12 is one of those vitamins that doesnt get enough credit , At a very basic level, B12 helps your body make healthy red blood cells. Red blood cells are what carry oxygen from your lungs to the