Vitamin B12 Injections: Benefits and Risks Are you feeling run down? Low Energy? A quick Vitamin B12 injection can help support energy, metabolism, and overall wellness. It delivers the vitamin directly into the muscle, allowing your body to B12 injections have been high on my list, and I finally took the plunge today! Better absorption is just one of the perks, as it bypasses the stomach. Bloodwork is typically not B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Is It Okay To Use A B12 Injection With Insulin Syringes? Vitamin B12 Injection Side Effects and Safety