A new Nature Communications umbrella review pools 123 meta-analyses spanning 464 outcomes from 5,617 articles into a unified evidence map. Benefits cluster across endocrine, cardiovascular, renal, respiratory, and cognitive domains plus selected-population mortality and fracture-risk reductions. Risks concentrate in diabetic retinopathy, ketoacidosis, gastrointestinal events, and treatment discontinuation. Most comprehensive synthesis of the GLP-1 class to date.