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What are the Symptoms of a B12 Deficiency
PMC 5683008
doi:10.1093/aje/kww212
(19) Gastric surgeries: If a portion of your stomach has been removed, the body cant produce enough IF, and the amount of space for B12 to be absorbed is also reduced
[DOI] [PubMed] [Google Scholar] 113.Thaisetthawatkul P., Collazo-Clavell M.L., Sarr M.G., Norell J.E., Dyck P.J.B