G3R is a synthetic triple agonist peptide researched in in‑vitro models for its simultaneous activity at GLP‑1, GIP, and glucagon receptors. In controlled laboratory settings, it is used to examine peptide‑receptor interactions and downstream cellular signaling relevant to metabolic regulation. In‑vitro studies have explored its effects on integrative hormone receptor activation, nutrient‑sensing pathways, and intracellular communication mechanisms. Its triple agonist profile makes Retatrutide a valuable tool for studying complex metabolic and endocrinological processes at the cellular level. Research Use Only. Not for Human or Veterinarian Use.