However, other studies haven't seen a link between low levels of B12 and cognitive problems or an improvement in these symptoms after getting extra doses of B12
References Bailey RA, Wang Y, Zhu V, Rupnow MFT
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The most common side effects reported to date have been malnourishment, due to a dramatic reduction in calorie intake, and significant gastrointestinal symptoms
Potential long-term pancreatic risks: recurrent pancreatitis chronic pancreatic inflammation pancreatic exocrine insufficiency increased diabetes risk possible pancreatic fibrosis Though evidence is still evolving, ongoing inflammation could contribute to long-term pancreatic dysfunction