Retatrutide (LY3437943) is a 39-amino acid synthetic triple-agonist peptide — often called 'triple G' — that simultaneously targets GLP-1, GIP, and glucagon receptors. It is the most advanced next-generation metabolic research compound currently available, studied for coordinated multi-pathway energy regulation. Phase 2 clinical trial data showed significantly greater metabolic endpoints than single or dual agonists.
Triple receptor mechanism
Retatrutide's simultaneous activation of three receptor systems sets it apart from semaglutide (GLP-1 only) and tirzepatide (GLP-1 + GIP). The glucagon receptor component adds a third pathway: glucagon receptor activation promotes energy expenditure and fat oxidation in preclinical models. Researchers use retatrutide to study coordinated metabolic signaling in ways that single or dual-target peptides cannot replicate, giving a broader platform for mapping metabolic interactions and receptor crosstalk.
Identity verification is critical
Retatrutide has a molecular weight of approximately 4683 Da. Mass spectrometry identity confirmation is non-negotiable for this compound — HPLC purity alone does not confirm you have the correct 39-amino acid sequence. Any vendor that does not provide MS data alongside HPLC documentation for retatrutide should be avoided. Finnrick Analytics has tested over 2,100 retatrutide samples across 138 vendors, with purity typically ranging from 98.72% to 99.95% among the top sources.
Research use only status
Retatrutide is not FDA-approved for any indication. It is available strictly as a research compound for laboratory use only. It is currently in Phase 2/3 clinical trials by Eli Lilly (LY3437943). Vendors selling it explicitly market it for research purposes only. It is not available through telehealth prescription at this time.
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