Additionally, she had indirect hyperbilirubinemia (4.4 mg/ml), low Vitamin B12 levels (44 pg/ml), normal serum iron levels and negative Coombs test

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It is supplied as a small-molecule laboratory reference material for controlled research and analytical review
Deficiency is more common than excess vitamin B12, but both are worrisome
Adequate levels of B12 are essential for overall health
Many ask this question when insulin seems like its just water and has little to no effect on blood sugars