Vitamin B12 Injections What You Need to Know, Vitamin B12 is essential for energy production, brain function, and nervous system health. A deficiency can lead to symptoms such as fatigue, mood Dr. prescribed B12 injections. Pharmacy only gave me vials. Where do you get your needles and syringes? What size?? Where do I inject? : r B12_Deficiency How to Give B12 Injections at Home to Yourself PA Relief How SubQ Injections Like B12 and NAD+ Fit Your Routine Olympia Pharmaceuticals