B12 is important for brain development in children
Simple timing framework Baseline Discuss baseline labs before starting, especially with autoimmune disease, gut symptoms, active injury, infection concern, liver disease, kidney disease, or copper concerns

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When that is not possible, doctors may prescribe transfusions, intravenous iron, and agents that stimulate red blood cell production to help improve the condition [49]
For most people with adequate B12 levels, additional intake through energy drinks is unlikely to meaningfully affect energy or alertness