Those who eat less meat, have autoimmune or thyroid conditions are also more likely to experience anemia caused by vitamin B12 deficiency
The short answer is: it depends on what symptoms you have and how deficient you are
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A deficiency of vitamin B12 can also cause shortness of breath or heart palpitations, as well as gastrointestinal symptoms including constipation, diarrhea, appetite loss, or gas
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Some people report feeling more energetic within a few days, while others might not notice improvements for several weeks, depending on the level of deficiency