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If you have a temporary deficiency or increased requirement (say, after a surgery or during recovery from an acute illness), you might only need a short course, perhaps a few weeks of injections, until your vitamin levels normalize or you can meet your needs by mouth again
For an over-the-counter tablet you are taking without a medical reason, your doctor may suggest pausing it and repeating the test later so the result can be interpreted cleanly
A balanced diet can provide adequate amounts of Vitamin B for most people
Mayo Clinic
This is often due to low energy levels in your body
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