b12 injection risks Shots Side Effects And How To Treat Them Vitamin B12 Injection: Uses, Benefits,
Description
Lidocaine and epinephrine injections are powerful local anesthetics used to relieve pain and discomfort by numbing the area of the body into which it is injected

1 In this study, adverse events considered possibly to be caused by hydroxocobalamin were chromaturia (n=5), pink-to-red skin discoloration (n=3), increase in heart rate (n=1), and elevated blood pressure (n=1)

I did not experience any weight loss, (or gain) but Im not necessarily taking these shots for weight loss

Alston CL, et al