Although studies are limited, there is some research to suggest a relationship between Vitamin B12 deficiency, fatigue, depression and foggy brain (Ref) Who is at risk for Vitamin B12 deficiency
Rook GA, Adams V, Hunt J, Palmer R, Martinelli R, Brunet LR
Carlstrm M, Lai EY, Ma Z, Steege A, Patzak A, Eriksson UJ, et al
Y., Chang, S
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