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Vasoactive intestinal polypeptide is believed to be the principal noncholinergic, nonadrenergic neurotransmitter in the gastrointestinal (GI) tract and has an effect on cholangiocytes to stimulate bicarbonate secretion and increase bile flow [11]

10.1038/nrd.2015.21 11 BarenholzY

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Are there any dietary sources of B12, and how do they compare to injections