Few areas of peptide science have moved as quickly as incretin research. In roughly a decade, the field has progressed from single-receptor GLP-1 agonists to dual and now triple receptor compounds — each generation adding a new signaling dimension for metabolic research. This guide maps the three classes and the research questions each one serves.
Generation One: GLP-1 Receptor Agonists
The foundation of the field is the GLP-1 receptor agonist — compounds modeled on the incretin hormone GLP-1, engineered for extended stability. In research settings, GLP1-S (semaglutide class) serves as the reference compound: laboratories use it to study GLP-1 receptor activation, satiety-related signaling, and glucose homeostasis, and as the baseline against which newer multi-agonists are compared.
Generation Two: Dual GIP/GLP-1 Agonists
The second generation adds glucose-dependent insulinotropic polypeptide (GIP) signaling to the same molecule. GLP2-T (tirzepatide class) activates both receptors, letting researchers examine how paired incretin signaling differs from single-receptor activation — a question with substantial published literature on glycemic response and body weight endpoints in preclinical models.
Generation Three: Triple Agonists
The frontier is triple agonism: GLP-1, GIP, and glucagon receptors engaged by one molecule. GLP3-R (retatrutide class) represents this class in research catalogs. The glucagon component adds an energy-expenditure dimension that laboratories study alongside the appetite and insulin pathways of the first two generations.
Beyond the GLP Family: Amylin Analogs
A parallel research track examines amylin receptor agonism — Cagrilintide is the leading research compound here, frequently studied in combination designs with GLP-1 class peptides to model dual-hormone approaches found in current metabolic literature.
Choosing Compounds for Metabolic Research
Comparative incretin studies depend on consistent, verified material across arms. Our GLP Receptor Agonists collection covers all three generations, each batch third-party tested to 99%+ purity with a Certificate of Analysis.
All products discussed are intended strictly for in-vitro research and laboratory use only. They are not for human or veterinary use, consumption, or therapeutic application.