Forth with life - Vitamin B12 is part of the B complex of vitamins alongside vitamin B9 (folate). They are essential vitamins, so the body is unable to make them itself and
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Vitamin B12 supplementation in treating major depressive disorder: a randomized controlled trial. – Micronutrients Research
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Cross-sectional association between vitamin B12 status and probable postpartum depression in Indian women | BMC Pregnancy and Childbirth | Full Text
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The effects of vitamin B on the immune/cytokine network and their involvement in depression - ScienceDirect
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