The Truth About B12 Injections: Benefits, Cost & How They Work 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 What are Vitamin B12 injections Vitamin B12 injections are used to quickly raise your B12 levels when they're low or when your body can't absorb it properly from food or tablets. What Feeling drained or low on energy? B12 injections can help support: Energy levels Focus Overall wellness A quick and simple way to give your body a boost when