Tirzepatide is a single 39-residue peptide that activates two incretin receptors, GIP and GLP-1. Its phase 3 trials in type 2 diabetes and obesity are among the largest in the field. It is also an approved pharmaceutical, which sets it apart from most compounds in this library.
Retatrutide adds a third receptor to the incretin approach, activating GIP, GLP-1, and glucagon receptors at once. Two phase 2 trials in humans were published in 2023, in the New England Journal of Medicine and the Lancet.
Retatrutide is the first triple GIP, GLP-1, and glucagon receptor agonist to reach late-stage human trials. Two phase 2 trials in humans were published in 2023, one in the New England Journal of Medicine and one in the Lancet.
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