Can Vitamin B12 injections be used as a treatment for deficiency?

Yes, Vitamin B12 injections are a common and effective treatment for severe B12 deficiency, particularly in individuals who cannot absorb B12 through food or oral supplements due to conditions like pernicious anemia or gastrointestinal surgery. Injections bypass the digestive system, delivering B12 directly into the bloodstream, and are typically administered at regular intervals depending on the severity of the deficiency.