b12 injections subcutaneous or im Choosing the Right Needle and Syringe for Injections: A Complete Guide Vitamin B12 Injection Deltoid Site
Description
I have also accessed other sites for my B12 injections, including, the upper arm (deltoid), thigh (vastus lateralis), and the buttocks (dorsogluteal)
Insert the needle at a 90 angle for IM injections

Factors Contributing to Post-Injection Symptoms After receiving a vitamin B12 injection, some individuals report feeling worse, a situation that can be perplexing

What symptoms can occur with vitamin B12 deficiency
