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)
Weill professor of metabolic research at Weill-Cornell Medical College in New York City
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Aging elevates NNMT in adipose and muscle tissues, disrupting metabolism