B12 $199 $65 one-month supply Improves energy, boosts metabolism, helps burn fat
In turn, this may contribute to the development of depression by increasing oxidative stress, DNA damage, and cell death in the body ( A 2020 study with 132 children and teens, 89 with and 43 without depression, found that the participants with depression had lower B12 levels and higher levels of homocysteine compared with those without depression ( In addition to depressive symptoms, low or deficient B12 levels may lead to other mental conditions, including psychosis and mood disorders ( Because a deficiency in B12 negatively impacts the central nervous system, people with low or deficient B12 levels may feel foggy-headed and have difficulty concentrating and completing tasks ( Fortunately, studies show that mental impairment related to low B12 levels can improve with B12 treatment

In contrast, DIO mice in both groups switched from WD to LD each had significantly increased Proteobacteria relative abundance (represented solely by the genus Parasutterella ) compared to both the WD and the LD controls, suggesting that Proteobacteria relative abundance may be largely influenced by stress or the differences in net energy expenditure (or associated body weight changes) caused by the diet switch
Association of vitamin B status with risk of dementia in cohort studies: a systematic review and meta-analysis
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