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 B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium 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 Vitamin B12 Injection Dosage Guide: 7 Essential Dosage Facts for Adults Liv Hospital