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Hi Polaris, thanks for replying

doi: 10.1016/j.lfs.2017.08.006

Auf psychischer Ebene kann ein Mangel an Vitamin B12 zu Lustlosigkeit, depressiver Verstimmung, Konzentrationsschwche, Nervositt und Schlafstrungen fhren

No single mechanism explains all observed effects

While additional studies are needed to determine whether elevated vitamin B 12 status may be related to cancer development, including evaluating whether it might be a potential marker of cancer, it is important for observational studies to adequately control for potential confounders, such as age, menopausal status, alcohol use, and intake of the B-vitamin folate