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 Auto Injectors menMD B12 Injection CITIZEN MEDS Prefilled & reusable pen injectors for peptides Ypsomed B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Vitamin B12 Injections: Benefits, Safety & How They Work