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Zheng et al., 2023)
However, for patients without a true vitamin B12 deficiency, research shows that B12 injections are unlikely to boost energy or reduce fatigue

Enhances brain-derived neurotrophic factor pathways, supporting neuronal growth, dendritic spine formation, long-term potentiation, and synaptic plasticity necessary for memory consolidation and cognitive function

doi: 10.1161/01.RES.0000245187.08026.47
