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Intrinsic factor is only made in the stomach and after a gastrectomy there is little to no more of it or gastric acid, and the active mechanism in the body where B12 is absorbed is either less available or not available at all depending on if the surgery was a total or a part of a gastrectomy

It is a peptide that has been studied for possible effects on sleep regulation, especially deep sleep or delta-wave sleep

However, despite promising findings, current research remains insufficient, and further investigations are needed to validate these compounds for future clinical applications

This process reduces DA neuron loss and enhances astrocytic metallothionein levels (Miyazaki et al., 2013)