glp-1 bacteria Gut microbiota and | Reviews in Endocrine and Metabolic Disorders GLP-1 Medicines And Gut Bacterial
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A simple 25 OH D blood test can be ordered to monitor vitamin D levels

Beyond the pancreas, GLP-1R is expressed in the brain (particularly the hypothalamus, brainstem NTS, and reward circuitry), heart, kidney, lung, gastrointestinal tract, bone, and immune cells
Kuhlicke J, Frick JS, Morote-Garcia JC, Rosenberger P, Eltzschig HK (2007) Hypoxia Inducible Factor (HIF)-1 Coordinates Induction of Toll-Like Receptors TLR2 and TLR6 during Hypoxia

Digestion is already slowed by the medication

But thats not the only aspect worth considering