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In this guide, we explain what these peptides are, what the science says so far, the risks you should know about, and what changed with the FDA in 2026
10.1210/edrv.20.6.0385
This centrally produced GLP-1 reaches specific receptors located in key structures involved in appetite regulation, such as the paraventricular nucleus, the lateral septum, the nucleus accumbens and the lateral parabrachial nucleus.2,3,6 Furthermore, it promotes aversive responses, inhibits neuroinflammation and gastric emptying, and stimulates sympathetic tone and thermogenesis in experimental models.2,4,6 Activation of GLP-1R on neurons in the arcuate nucleus stimulates the production of pro-opiomelanocortin (POMC), which in turn inhibits neurons that produce neuropeptide Y (NPY), thereby generating an appetite-suppressing response.2 GLP-1 production has also been reported in the olfactory bulb, although its significance remains unclear.2,6 GLP-1R has been identified in the sinoatrial node, atrial and ventricular myocytes, and vascular endothelium
The intranasal spray formulation provides additional scientific value by allowing laboratories to investigate formulation stability, spray consistency, peptide integrity, physicochemical properties, analytical reproducibility, and intranasal delivery system performance
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