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These pathways are collectively referred to as the methylation cycle, the major activity of which is the transfer of methyl groups between molecules

Surgery involving partial or complete removal of any part of the gastrointestinal tract, including some bariatric surgery procedures, will reduce food-bound B12 absorption and lower serum B12 concentrations

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Liposomal delivery surrounds nutrients with phospholipids that resemble components of cell membranes

If you need to add vitamin B12 rich foods to your diet, you must eat the liver and kidneys, especially lamb

H2 blockers like ranitidine have similar but less severe effects