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How long it lasts can be anywhere from a few minutes to hours, based on the dose and how well the patient can handle it
No adverse effects were reported, but rigorous, large-scale trials are lacking
Its always best to draw each dose immediately before administration
More isnt always better when it comes to B12 injections
This is also why random or sporadic injections often fail to produce strong results
The unfortunate truth is that big risk signals (lets say the kind you get from drinking antifreeze) can be spotted from the anecdotal experience of people in the world just trying things, but small-but-serious risk signals (lets say cardiovascular disease with tofacitinib) are really hard to identify without a proper trial or a proper observational study
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