How Long Does It Take Vitamin B12 Injections to Work? Vitamin B12 Injections! Packed with amazing benefits, these injections are a game changer for your wellness journey. Here's why you should consider them: Quick & Efficient: Direct absorption for faster, more effective 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 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