Peptide Index Research Research • Testing • Transparency PEPTIDE INDEX TAKEAWAY Mazdutide is a real dual glucagon / GLP-1 peptide with strong Phase 3 data in China and a real China approval. That does not make U.S. gray-market research vials the same drug, and it does not mean FDA approval. EVIDENCE • Strong — Phase 3 efficacy in the studied Chinese populations (GLORY-1 / GLORY-2) • Moderate — U.S. Phase 2 signal only (no U.S. Phase 3 / no FDA approval as of Sept 2026) • Strong — literacy claim (China approval ≠ FDA approval ≠ research vials) WHAT IT IS • Mazdutide (IBI362 / LY3305677) is an oxyntomodulin-analogue peptide that activates both the glucagon receptor and the GLP-1 receptor • Developed with Lilly IP; Innovent holds China rights; China brand name Xinermei • Same broad dual-agonist class as survodutide — different molecule, different sponsors, different trials WHAT WE KNOW • China NMPA approved mazdutide for chronic weight management (June 27, 2025) and for glycemic control in adults with type 2 diabetes (Sept 19, 2025) • Not FDA-approved in the United States as of this check (Sept 18, 2026) • GLORY-1 Phase 3, peer-reviewed in NEJM (Chinese adults with overweight/obesity, n=610, once-weekly SC): efficacy estimand at week 48 mean weight change −12.05% (4 mg) and −14.84% (6 mg) vs −0.47% placebo (NCT05607680) • GLORY-2 Phase 3, peer-reviewed in JAMA (2026): mazdutide 9 mg mean weight change −16.65% at week 60 vs −1.50% placebo • U.S. Phase 2, peer-reviewed in The Lancet Diabetes & Endocrinology (online Aug 21, 2026; NCT06124807, n=179, no T2D): week-32 least-squares mean weight change −7.3% / −15.6% / −18.1% at 3–6 / 10 / 16 mg vs −0.9% placebo • GI side effects are the main tolerability story; higher U.S. doses had more discontinuations WHAT WE DON’T KNOW • Whether U.S. Phase 3 will match China Phase 3 or the high-dose U.S. Phase 2 signal • Long-term hard outcomes (CV events, mortality) in Western populations • What identity, purity, sterility, or dose any gray-market “mazdutide” vial actually contains