What are the Benefits of B12 Injections? VSM Pharmacy Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the 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 A Guide to Needle and Syringe Choices Support energy, mental clarity, and overall wellness with our Hydroxocobalamin (B12) IM injection. This essential B vitamin helps support energy production, nerve function, and metabolism so you can feel your best. What Size Needle for B12 Injection?