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B12 injections are an effective method of maintaining healthy levels of B12 in your body
Systematic collection of adverse events was not done in all of these studies and interpretation of causality is limited due to the lack of a control group and due to circumstances of administration (e.g., use in fire victims)
For home use, subcutaneous is the standard route for a few practical reasons
A narrower mechanism usually means fewer off-target signals to interpret
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