does b12 injections cause diarrhea Shots Side Effects And How To Treat Them Sublingual B12 vs. B12 Injections:
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Additionally, vitamin B 12 deficiency can also occur as a result of other malabsorptive conditions (such as inflammatory bowel disease, or pancreatic insufficiency), after certain procedures (such as bariatric surgery, or ileal resection), restricted diets (such as veganism), or the use of certain medications (such as metformin or proton-pump inhibitors)

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Another person may see lab values normalize while symptoms take longer to catch up

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