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 Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Shots Do You Need a Prescription? A Complete Guide Carter's Walk In + Urgent Care