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its rationale comes from how the four component mechanisms fit together
Vitamin B12 levels are usually tested with a blood serum test, and values below approximately 170250 picogram per milliliter in adults are considered signs of deficiencies
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Because vitamin B 12 in supplements is not bound to protein, and because intrinsic factor (IF) is still available, the absorption of supplemental vitamin B 12 is not reduced as it is in pernicious anemia
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