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If you have feelings of depression, B12 injections may actually improve your mood

Haematological parameters typically normalise within approximately 8 weeks of appropriate treatment

The results of the following tests were normal: iron, folate, cortisol, thyroid-stimulating hormone, free thyroxine, rapid plasma reagin, and serological assays for human immunodeficiency virus, hepatitis B virus, and hepatitis C virus

Theories include alteration of bile acid metabolism, small intestinal bacterial overgrowth, effects on intestinal motility and interference by metformin on vitamin B12-intrinsic factor absorption in the terminal ileum