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Intrinsic factor, a protein that shuttles B12 through the absorption process, becomes saturated after a meal containing an above-average amount of B12 and about 4 to 6 hours are required before it can efficiently absorb another dose (IOM, 1998)
What are the practical differences
J., Barbas, C., Daiber, A., et al
But the answer is never to exceed the maximum approved dose
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