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A landmark 2026 narrative review in Clinical Obesity (Urbina et al.) spanning 480,825 adults found vitamin D deficiency in 13.6% of users by 12 months, iron depletion with 2630% lower ferritin, and more than 60% consuming below requirements for calcium and iron (PubMed)

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Description Additional information Molecular formula: C221H342N46O68 Molecular weight: 4731 g/mol Scientific Description (RUO Only) Retatrutide is a synthetic multi-agonist peptide engineered to interact with GLP-1, GIP, and glucagon receptors

John Roxborough, MD , and our team are here to help you understand the differences between these medications and choose the one thats right for you