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NHS article about B12 deficiency nhs.uk/conditions/vitamin-b

It also reduced enteric serotonin release while suppressing intestinal motility

Dietary factors also influence B12 requirements

In addition, low IGF-1 subjects in a study were found to possess up-regulated fatty acid metabolism along with down-regulated GLUT-1 gene (in charge of glucose uptake in erythrocytes, brain endothelial cells, eye, peripheral nerve and also responsible for materno-placental glucose transfer) [210]