B12 Injections vs Pills: Richmond's Complete Guide B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics 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 Most people trust B12 tablets and normal blood reports but is that enough? Dr. Amir explains why B12 injections offer better absorption and lasting benefits, especially for vegetarians or those over The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine