Feeling worse after B12 Injection: Answering concerns. La Vie Med Spa Subcutaneous vs intramuscular what's the difference? #vitamintherapy #theb12store #injection Vitamin B12 injections Bexleyheath Persona Medical Aesthetics Has anyone had a b12 injection and told to stand up while doing and not all inserted and some went down my arm xx Some people think the needle is left in their arm when they have IV. In reality, it's only a small plastic catheter that is easily bendable. So don't be afraid to move Why Do I Feel Worse After My B12 Injection: 6 Body Reactions