retatrutide mechanism glp-1 gip glucagon triple agonist review 2024 2025 ๐งฌ R3TA is a next-generation peptide being studied for its unique triple-receptor approach to metabolic health. Unlike traditional therapies, R3TA is designed to interact with three metabolic pathways simultaneously: GLP-1, Frontiers | Glucagon-like peptide-1 and
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