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Improved mood and mental clarity (11-14% of reviews) A subset of the energy-improvement group specifically mentions mood elevation, reduced anxiety, or "mental sharpness." This aligns with B12's role in neurotransmitter synthesis and methylation reactions affecting serotonin and dopamine pathways (Kennedy, Nutrients , 2016)
Vitamin B12 or folate deficiency anaemia Causes
That means faster, more reliable absorption than oral supplements
The finding of Ileibacterium as the most abundant cecal microbiome genus in every experimental group is relatively novel and may reflect experimental factors such as diet, housing conditions, and mouse strain
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