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10.3390/ijms20030527 Summary Keywords vitamin b12 deficiency, Imerslund-Grsbeck syndrome, AMN gene, megaloblastic anemia, proteinuria Citation Xing L, Guo Y, Li Y, Zhou X, Lin F and Wang Y (2025) Vitamin B12 deficiency in a young male with Imerslund-Grsbeck syndrome: case report

Blood samples taken at five and 13 years after the start of the study showed that average vitamin B12 levels were lower among participants on metformin at the five-year mark

These audits and no doubt countless associated studies, have encouraged GPs to reduce the number of B12 injections and in some cases stop them altogether