B12 Injections Feeling tired, run down, or dealing with brain fog? A B12 shot might be just what you need! Boosts energy Supports metabolism Improves mood How Quickly Does B12 Shot Work? Does It Help to Lose Weight? 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 Quickly Do You Feel Better After B12 Injections?