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doi:10.1038/s41564-021-00880-5 Zhang Y, Liu R, Chen Y, et al
Intensive training programs, restricted diets during cutting phases, and the use of certain supplements or medications can all impact B12 status
What the drug does for a person taking it purely for weight loss, with no such history, is a related but separate question one on which the evidence is thinner
Meta-analyses suggest potential cognitive protection at a population level (Cukierman-Yaffe et al., 2025)
Never use tap water
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