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 Vitamin B12 Injections: Hot Shots? Full Guide PA Relief B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Why Does B12 Sting Testosterone injections dont have to hurt! Heres whats in my painless T injection kit and the technique I teach my TRT patients: Ice to numb the skin Alcohol swab to prep the site No waste