What Happens If You Inject B12 Wrong? PA Relief What Happens If You Inject B12 Wrong: 6 Red Flags Are Vitamin B12 Injections Worth Your Money? 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 onefiftylives Your body stores 3 5 years of vitamin B12, yet 15% of adults run deficient. Blood tests miss 40% of cases. Here is what you need to know. Instagram