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It is elective, but for patients who want data-driven confirmation before starting the next cycle, it covers all the right markers
Find a supplement with a functional dose: Most of the doses in B12 supplements are between 500 and 5,000 micrograms and will give you enough B12
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Intrinsic factor deficiency causes pernicious anemia, which may be associated with subacute combined degeneration of the spinal cord
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