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They also play an important role in the production of brain messengers known as neurotransmitters
However, it is critical to recognize that clinical symptoms of deficiency can manifest without anemia or low serum vitamin B12 levels
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However, serum B12 has a limitation: it can appear within the reference range even when cellular-level deficiency exists, because it captures both active and inactive forms of the vitamin
The treatment is administered through direct injection into muscle tissue, typically in the upper arm, thigh, hip, or buttocks area [5]