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For a vitamin B12 injection to have an effect, several things must be considered, including the individuals metabolism and how frequently the injections are given
Because levels are often quite low before a deficiency is recognized, it can take some time for serum concentrations to even out and symptoms to subside
Some individuals may experience mild injection-site reactions (e.g., redness, swelling) or occasional headaches
How long does it take for a B12 injection to kick in
Failing to record the puncture date is the most common storage error in laboratory settings
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