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 Deficiency Symptoms (ex. Depression), Why symptoms happen, Schilling's test, Treatment - YouTube
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Vitamin B12 supplementation in treating major depressive disorder: a randomized controlled trial. – Micronutrients Research
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