Benefits of B12 Injections for Optimal Health Vitamin B12 Injection Side Effects and Safety The look of surprise never gets old when we do B12 injections and it doesnt hurt , B12 is a great vitamin to increase energy, reduce fatigue, improve nerve function, and so much more! Thank you to Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the Reducing pain from intramuscular b12 injections with coughing trick How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust