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B12 is water-soluble, so your body uses what it needs and passes much of the extra through your urine
Increased intake of calcium reverses vitamin B12 malabsorption induced by metformin
Additionally, Pernicious anemia, an autoimmune condition affecting the stomachs ability to produce intrinsic factor (a protein necessary for B12 absorption), can also lead to deficiency
People with UC may also develop other types of nutritional deficiencies
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