24 Hour B12 Injections ThinWell Clinic A Guide to the Best Needles for B12 Injections Precision Labs 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 What size of needle is best for IM injection 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