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 to Give a B12 Injection: Step By Step Instructions Places for Intramuscular Injection: 4 Safe Spots Instruction Guide for Intramuscular (IM) Self injection of B12 Methylcobalamin 1mg 5mg Intramuscular injection: Locations and administration How to Give Yourself a B12 Injection ThinWorks