Are B12 Shots Safe? Royal Palm Beach Medical Group B12 Shots for Energy: Do They Work, Who Needs Them & What to Expect Greenwich Medical Spa If I took vitamin B12 injections and folic acid along with magnesium, a B complex, and carnitine, but there was no improvement and my condition actually worsened with increased anxiety, does this mean If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that