Needle Size for B12 Injection: 5 Must Know Tips 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 How Big Are the Needles for Semaglutide Injections? 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 a B12 Injection: Step By Step Instructions