Vitamin B12 shots: Uses, benefits, and side effects Vitamin B12 Injections: Benefits and Risks Now offering B12 injections! If these symptoms sound all too familiar, it might be time to check your vitamin levels. B12 injections may be absorbed up to 90% more effectively than oral Many people believe that vitamin B12 is only found in animal products, but that's a misconception. B12 is actually produced by bacteria in the soil, and animals get their B12 by consuming