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In a March 31, 2026 warning letter, the agency said that products offered as Retatrutide or GLP-1-R peptide were unapproved new drugs under federal law
The FDA warns that, unlike FDA-approved drugs (Mounjaro and Zepbound), you cannot be sure of the purity, quality, efficacy, or safety of compounded tirzepatide
The two professionally accepted options each have specific characteristics, and understanding them is key to making the right choice for your research
10.3390/ijms20246196 Int J Mol Sci
External resources ClinicalTrials.gov - Retatrutide Phase 2 Study (NCT04881760) ClinicalTrials.gov - Retatrutide Phase 3 Study (NCT06859268) For researchers committed to getting the most from their retatrutide protocols, SeekPeptides offers comprehensive protocol guidance, dosing calculators , and a community of thousands who have navigated these exact starting dose decisions
