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 Patient Guide to Self Administering Vitamin B12 Injections Southmead Surgery B12 injections UK How I give myself a vitamin injection Vitamin B12 Cyanocobalamin Injection 1000 mcg mL 1 mL Med Plus Physician Supplies