High B12 Levels Can Still Be A Sign Of Something Else That said, a persistently high B12 level on a blood test is worth paying attention to not because the B12 itself is dangerous, but because it can be an indicator that something else is going on in the body
Constant fatigue, poor focus, irritability, and even symptoms that mimic depression
Rates do not apply to holidays, Easter, long weekends, national holidays, Christmas or New Year
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However a blood serum test merely indicates how much B12 is swimming around in the bloodstream, NOT what is actually getting into the cells where it's needed for use by the body
It examined a single cancer type in cell culture rather than living animals