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 Needle Injection Techniques Every Nurse Should Know! Whether you're prepping for your NCLEX or brushing up on your skills, here's a quick breakdown of the most common injection routes you'll encounter B12 vitamin Store How to Perform a Subcutaneous Injection of Vitamin B12