retatrutide and tirzepatide vs Tirzepatide: Key Differences Explained (2026) Retatrutide vs Tirzepatide (Research Comparison)

Consider the timing of your injection

Stewart and Ogden, 2019) and, compelling evidence indicates that maintaining an elevated BMI over the long term significantly increases the risk of developing chronic diseases (Sainsbury and Hay, 2014), body positivity became a robust cultural narrative, encouraging society to respect the dignity of all body sizes and to question the assumption that thinness equates to health (Holi, 2025

N Engl J Med 326:13161322

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Retatrutide produced about 24.2% mean weight loss at 48 weeks (Jastreboff et al., 2023), versus roughly 20.9% for tirzepatide at 72 weeks

p = 0.004) [30]