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This is because there are few vegan foods that contain B12 and also because the body finds it significantly more difficult to absorb B12 from the few vegan sources that have it

Springer US, New York, NY (2022)

Again, these are signs frequently observed when FIP affects the nervous system

Intrinsic factor is produced by the stomach lining and is necessary for the absorption of Vitamin B12 Removal of a portion of the stomach (i.e
