People with fatigue, plant-based diets, digestive disorders, or busy lifestyles often benefit greatly from B-12 shots
[12] These cellular effects may contribute to hypotheses about tissue-repair-associated pathways in preclinical models, but they do not establish human repair efficacy, clinical benefit, or safety
Batool, et al
Cognitive decline: Low B-12 is associated with increased risk for Alzheimers disease, brain shrinkage, and general cognitive impairment especially for older adults
rather than simply increasing or decreasing neurotransmitter levels, it seems to restore homeostasis
Since multiple species of Propionibacterium produce no exotoxins or endotoxins and have been granted GRAS status (generally regarded as safe) by the United States Food and Drug Administration, they are the preferred bacterial fermentation organisms for vitamin B 12 production