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It bypasses first-pass hepatic metabolism which oral delivery does not allowing a greater proportion of the absorbed peptide to remain intact as it enters circulation.7 The olfactory pathway also provides a potential direct nose-to-brain route, bypassing the blood-brain barrier a property that has generated interest for neuropeptides and potential neurological applications

Park et al., 2005

However, individual differences and other factors like existing health conditions also play a role

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Efficacy Landscape: Glucose-Lowering vs Weight-Loss Potential No single agent dominates on every axis, and the relative ranking is shifting month to month as 2026 Phase 3 data mature