Instruction Guide for Intramuscular (IM) Self injection of B12 Methylcobalamin 1mg 5mg B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. B12 vitamin Store How to inject B12 in your arm B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Injections at Home Safety Guide for Self Administration Infusion For Health B12 Shots at Home: NHS Guide to Safe Self Administration Bolt Pharmacy