retatrutide gallbladder adverse events trial Side Effects Guide: 21 Proven Remedies That Work Retatrutide for Weight Loss: 2026

People With a Personal or Family History of Thyroid Cancer This is the clearest contraindication

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98% is considered research-grade for both peptides, but 99% purity is strongly preferred for combination repair studies, wound healing experiments, musculoskeletal repair research, cardiovascular biology, and neuroprotection studies where compound purity of both peptides directly affects biological activity measurements and experimental reproducibility

Journal of the American Medical Association, 327 , 138

In summary, observational studies have not found an increased risk of PDAC during short term follow-up

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