Instruction Guide for Intramuscular (IM) Self injection of B12 Methylcobalamin 1mg 5mg Lets do my first B12 injection together This is something Ive been nervous about for a long time, but today I finally did itand it honestly wasnt bad at all. I used the Union Medico needle guide How To Give B12 Injection + Benefits B12 Injection sites + How to use B12 Shots Safely B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics