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In summary, the usual dose for Vitamin B12 shots in adults is 1000 mcg (1 mg)

They are particularly beneficial for vegetarians and vegans (since B12 is found primarily in animal products), older adults with reduced absorption capacity, individuals with digestive conditions such as Crohn's disease or celiac disease, and anyone who has had gastric bypass surgery

Over time, if left untreated, pernicious anemia can cause severe complications such as nerve damage, cognitive problems, and heart issues

Unknown drug interactions

Some individuals are more prone to a B12 deficiency than others

A sore arm after a flu shot is a direct result of the immune response triggered by the influenza vaccine