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In contrast, the passive diffusion process of B 12 absorption normally a very small portion of total absorption of the vitamin from food consumption may exceed the haptocorrin- and IF-mediated absorption when oral doses of B 12 are very large, with roughly 1% efficiency

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"Conformational changes on substrate binding to methylmalonyl CoA mutase and new insights into the free radical mechanism"

Mechanism of action [edit] Vitamin B 12 refers to a group of compounds called cobalamins that are available in the human body in a variety of mostly interconvertible forms