retatrutide mechanism of action triple agonist glp-1 gip glucagon Beyond GLP-1: Retatrutide's triple-agonist (GLP-1, GIP, glucagon) is redefining metabolic health. Phase 2 data shows ~24% weight loss—surpassing semaglutide & tirzepatide. Evidence-based protocols demand nutrition support alongside prescribing Frontiers | Glucagon-like peptide-1 and
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