B12 injections are intramuscular shots of vitamin B12, a water-soluble vitamin that plays a critical role in maintaining nerve function, red blood cell production, and overall energy levels. While B12 can be found in foods such as meat and dairy, certain individuals may have difficulty absorbing it through their diet or need an extra boost. B12 injections deliver the vitamin directly into your bloodstream, providing immediate benefits. This treatment is particularly beneficial for those with a B12 deficiency, vegetarians, or people experiencing fatigue, low energy, or sluggish metabolism.