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Side effects are rare but can include mild discomfort at the injection site or a slight rash
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The absorption speed of B12 depends on whether someone takes sublingual tablets that dissolve under the tongue or requires B12 injections
There is no topical or immediate-use injectable emergency form
Typically, people are not considered B-12 deficient until levels go below 200 pg/mL, although older adults may have symptoms of deficiency at blood levels of 200 to 500 pg/mL (CDC, 2012)
More drug is not always better drug
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