Vitamin B12a is widely used in the medical field to treat and prevent vitamin B12 deficiency, which can lead to conditions like anemia, fatigue, and neurological issues. It is also administered to patients with pernicious anemia, a condition where the body cannot absorb vitamin B12 effectively. In addition to its therapeutic uses, it plays a role in supporting healthy nerve function and red blood cell production. It is sometimes included in dietary supplements and fortified foods to ensure adequate intake, particularly for individuals with dietary restrictions, such as vegans or vegetarians. In research, it is utilized in biochemical studies to understand its role in metabolic processes and enzyme function.