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So the practical takeaway is not oral is better or SC is better. It is: pick one route, follow the documented per-dose figure for the vial you have, and keep the route constant so that whatever you observe is not confounded by a mid-stream route change

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Low vitamin B12 levels can cause issues such as fatigue, anemia, and lack of focus

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We look at the full picture: hormone levels, lifestyle, health history, and goals