How to Give a Buttock Injection Intramuscular Injection Technique vitamin b12 injection How to Self Inject Vitamin B12 at Home The Sanctuary Wellness Institute How to Safely Self Inject a B12 Shot Perfect for IV Med Spa Clients! , Steps to give yourself an intramuscular shot:, 1 Prep Your Supplies: If youre drawing up B12 yourself, attach a needle to 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