selenium glutathione production as an Antioxidant: Roles and Clinical Applications in Critically Ill and Trauma Patients: A Narrative Review Nutrition function of selenium. The

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Nature 560 , 649654 (2018)

It increased survival of cultured enteric neurons and proliferation of enteric glial cells, suggesting direct neuroprotective effects on the enteric nervous system that could influence central serotonin tone through vagal signaling

You can fall in the "normal" range and still be functionally deficient