For a client with pernicious anemia, which vitamin is commonly administered via injection?

Pernicious anemia is a type of anemia that arises from the body's inability to absorb vitamin B12 due to a lack of intrinsic factor, which is necessary for vitamin B12 absorption in the intestines. Because vitamin B12 is vital for the production of red blood cells and the proper functioning of the nervous system, individuals with pernicious anemia require this vitamin to be administered through injections. This bypasses the digestive system, allowing the vitamin to enter the bloodstream directly and correcting the deficiency.

Vitamin B12 injections are typically utilized as part of the treatment plan for pernicious anemia, often given regularly to maintain adequate levels in the body, alleviate symptoms, and prevent complications. The other vitamins listed do not address the specific deficiency associated with pernicious anemia. Therefore, vitamin B12 is the essential vitamin associated with this condition and is administered via injection to effectively manage it.