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Vitamin B12 contributes to Energy yielding metabolism Functioning of the nervous system Red blood cell formation Homocysteine metabolism Psychological function Functioning of the immune system Vitamin B12 also plays a role in the process of cell division and the reduction of tiredness and fatigue

Vitamin B12 is essential for proper neurological function, as it directly influences neurotransmitter productionthe chemical messengers responsible for mood, focus, and cognitive performance

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It is not clear whether findings in rodent studies are applicable to humans