What to Know If You're Considering B12 Shots

4. Who Should Get a B12 Shot?

Some B12 utilization disorders are hereditary, so people with a family history of low B12 levels or poor absorption should be tested for deficiencies. Many adults with pernicious anemia or a related disorder might consider B12 shots, at least initially, to quickly increase their levels of the nutrient and prevent the progression of symptoms. People who follow a vegan diet may need to get B12 shots since the vitamin is largely nonexistent in plants and plant-based products unless deliberately added. However, vegans who don't have difficulty absorbing the vitamin can take an oral supplement instead. Older adults often experience B12 deficiency as they age, so doctors may recommend injections.