B12 vitamin Store How to inject B12 in your arm Where to Inject Vitamin B12 B12 Injections at Home Safety Guide for Self Administration Infusion For Health 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 At Home Vitamin B12 4 Week Injection Package MUST BE A FLORIDA RESID CardioMender, MD