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Have irregular routines, frequent late nights, or long indoor hours

Even considering all of these factors you need to understand that checking vitamin B12 levels in the serum still isnt the best way to evaluate for B12 deficiency

An additional feature of microglial activation in ageing is an increased reactivity to immune system stimuli (Xue et al., 2021)

Early-life stress increases OxS in prefrontal and hippocampal PV interneurons [191]