Tag: intrinsic factor
How vitamin B12 absorption works: two competing pathways explain why high-dose pills can rival injections
Vitamin B12 is absorbed via two pathways: intrinsic factor, which saturates at 1.5 µg per dose, and passive intestinal diffusion,…
Why High-Dose Vitamin B12 Supplements Work Despite Poor Absorption
Research reveals how vitamin B12 supplements overcome absorption limitations through a backup pathway. While efficiency drops dramatically at high doses,…
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