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For example, a common plan is to give 1000 mcg daily for a week

So the benefit is real, but it is indirect and it depends on whether you were low to begin with

There are several causes of vitamin B12 deficiency, including poor dietary intake, malabsorption, and pernicious anemia

Nitrous oxide exposure (during surgery or recreational use) can inactivate B12 and cause rapid neurological deterioration in vulnerable individuals

While oral B12 is widely available, its not always the most effective, especially for individuals with absorption issues (like those with digestive disorders or older adults)

If you consider discontinuing the shots because your daily B12 injections arent working, or because chronic fatigue is still bothering you, it might be that you havent given them enough time to work