retatrutide long-term side effects Lilly's shows 28% weight loss, but increased Tirzepatide vs. Retatrutide: Key Differences

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The first head-to-head clinical trial (SURMOUNT-5, published in NEJM 2025) showed tirzepatide produced 20.2% average weight loss at 72 weeks versus 13.7% for semaglutide approximately 47% greater relative weight loss

Common Side Effects Nausea Nausea is the most commonly reported side effect, particularly during the initial loading phase

While the FD&C Act provides the framework for drug approval and regulation in the U.S., the current trend of using Ozempic for weight loss demonstrates how consumer behavior can sometimes outpace regulatory intent

These two melanocortin peptides are frequently confused due to their similar names, but understanding their distinctions is essential for researchers evaluating their respective roles in photoprotection, pigmentation, and beyond