when were glp-1 agonists approved for weight loss Indications GLP-1/GIP RA Summary Sheet and Beyond! Navigating the -tides: Medication-Assisted Weight
Description
While medications may share GLP-1 receptor activity, FDA approval applies to specific products and patient populations studied in clinical trials

Effects of subcutaneous tirzepatide versus placebo or semaglutide on pancreatic islet function and insulin sensitivity in adults with type 2 diabetes: A multicentre, randomised, double-blind, parallel-arm, phase 1 clinical trial

doi:10.1016/S1474-4422(09)70062-6 181
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Interestingly, GLP-1 is also produced in a smaller amount in the brainstem, specifically the nucleus of the solitary tract