1941 "The Saga of Lasker," Feb
Dietary sources of B12 are almost exclusively animal-derived and include: Meat and poultry Fish and shellfish Dairy products and eggs Fortified foods such as certain breakfast cereals and plant-based milks B12 is absorbed in the small intestine with the help of a protein called intrinsic factor , produced by the stomach lining
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References Chang CH, Tsai WC, Lin MS, et al
This is not a matter of dosage, brand, or formulation