Vitamin B12 Injection Dosage for Adults: 7 Key Facts & Guidelines Liv Hospital 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 Ivy Grove Surgery : Self administration of B12 injection 24 Hour B12 Injections ThinWell Clinic What needle size is best for injec Pernicious Anaemi like, swipe, and save for when it's your turn to do an injection on a patient Intramuscular (IM) Angle: 90 Needle Size: 2225G, 11.5 inch Med Examples: Vaccines (e.g. Tdap,