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The serum concentration of vitamin B12 is a commonly used marker of vitamin B12 status

Its exact mechanism of action remains partially elucidated, but evidence suggests it interacts with GABAergic, serotonergic, and hypothalamic pathways to influence central nervous system activity

Scientists call it a cytoprotective peptide, meaning it is tested for its ability to shield cells from damage

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The most responsible framing is: Short-term tolerability is not the same as long-term safety Manufacturing quality heavily affects risk People with medical conditions or those taking medications should talk to a clinician before considering unapproved substances