The GLP-1 Receptor Research Framework

Native GLP-1 is an incretin hormone with a ~2-minute half-life, impractical for sustained research. The GLP-1 research peptide class addresses this through structural modifications across four generations.

Glucagon-like peptide-1 (GLP-1) is an incretin hormone secreted by intestinal L-cells in response to nutrient ingestion. Native GLP-1 binds the GLP-1 receptor (GLP-1R) — a class B G-protein-coupled receptor coupled to Gs/cAMP signalling — driving glucose-dependent insulin secretion, glucagon suppression, delayed gastric emptying, and CNS appetite-circuit modulation.

The Four-Generation Research Lineage

From first-generation mono-agonists to today’s triple receptor agonists.

Advanced Peptide Science Growth Hormone & Performance research-grade peptide compounds
Liraglutide

1st gen GLP-1 analogue

3751.2 Da · 97% native homology · C16 fatty-acid albumin binding

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Advanced Peptide Science Growth Hormone & Performance research-grade peptide compounds
Semaglutide

2nd gen GLP-1 analogue

4113.6 Da · Aib8 substitution + C18 fatty-diacid

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Advanced Peptide Science Growth Hormone & Performance research-grade peptide compounds
Tirzepatide

3rd gen GIP/GLP-1 dual agonist

4813.5 Da · 39 amino acids · C20 fatty-diacid

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Advanced Peptide Science Growth Hormone & Performance research-grade peptide compounds
Retatrutide

3rd gen GIP/GLP-1/glucagon triple agonist

~4700 Da · First-in-class triple receptor

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Mechanism of Action

GLP-1R is a class B G-protein-coupled receptor with a characteristic seven-transmembrane structure and large extracellular ligand-binding domain. Agonist binding activates Gs-coupled cAMP signalling, with downstream activation of PKA and Epac2.

At pancreatic beta cells: glucose-dependent insulin secretion through enhanced ATP-sensitive K+ channel closure. At CNS GLP-1R-expressing neurons (arcuate nucleus, brainstem): anorexigenic activation. Glucagon suppression at pancreatic alpha cells and delayed gastric emptying complete the integrated signalling profile.

Advanced Peptide Science research laboratory — research peptide compounds

Combined Research Formulation

For parallel incretin + lipolytic pathway research.

Advanced Peptide Science Peptide Blends research-grade peptide compounds

Metabolic Blend (Semaglutide + AOD-9604)

The Metabolic Blend co-formulates Semaglutide (GLP-1 receptor agonist) with AOD-9604 (hGH 176-191 lipolytic fragment) for combined incretin + direct lipolytic pathway research within a single vial.

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For Research Use Only. Not for human consumption. Not intended to diagnose, treat, cure, or prevent any disease.