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 Inject Vitamin B12 medicalweightlosscentersofamerica.com How to Give a B12 Injection: Step By Step Instructions Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium How to Give a B12 Injection: Step By Step Instructions Subcutaneous Injection: What It Is and How to Give One