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"Optic neuropathy as a presenting feature of vitamin B-12 deficiency: A systematic review of literature and a case report"

It plays an important role in the production of red blood cells, DNA synthesis, and nerve function

Vitamin B12 deficiency can cause digestive problems like diarrhea, constipation, or loss of appetite

For Vitamin B12 injections, a gauge ranging from 25 to 30 is typically recommended

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Nevertheless, certain conditions can impact the absorption or intake, hence often leading to deficiency, for example, pernicious anemia or if the individual follows a vegan diet