Two of the most studied GLP-1 receptor agonists in peptide research are GLP-1S (GLP-1S at Rapid Research CO) and GLP-2T (GLP-2T). While both activate the GLP-1 receptor, their pharmacological profiles diverge significantly. This comparison is designed to help researchers choose the right compound for the right experimental question.
Receptor Pharmacology: Where They Differ
GLP-1S is a selective GLP-1 receptor agonist. It was engineered from human GLP-1 with fatty acid modification to extend its half-life. It binds with high affinity to GLP-1 receptors expressed in pancreatic beta cells, the hypothalamus, the gut, and elsewhere.
GLP-2T is a dual GLP-1 / GIP agonist. GIP (glucose-dependent insulinotropic polypeptide) is an incretin hormone produced in the small intestine. By activating both the GLP-1 receptor and the GIP receptor simultaneously, GLP-2T engages two distinct incretin pathways in a single molecule.
| Property | GLP-1S | GLP-2T |
|---|---|---|
| Receptor Targets | GLP-1R | GLP-1R + GIPR |
| Mechanism Class | Selective agonist | Dual agonist |
| Molecular Formula | C₁₈₇H₂₉₁N₄₅O₅₉ | C₂₂₅H₃₄₈N₄₈O₆₈ |
| CAS Number | 910463-68-2 | 2023788-19-2 |
| Purity (Rapid Research CO) | ≥99% | ≥99% |
| Available Sizes | 5mg, 10mg, 15mg | 5mg, 10mg, 15mg |
Research Applications
When to Use GLP-1S
GLP-1S is the appropriate choice when your research question is specifically about GLP-1 receptor signaling. Its selectivity makes it a cleaner tool for isolating GLP-1 pathway effects without GIP receptor confounding. It is widely used in metabolic research, glucose homeostasis models, and appetite regulation studies.
When to Use GLP-2T
GLP-2T is the better choice when you want to study incretin synergy — the combined effect of GLP-1 and GIP co-activation. It is particularly relevant for research investigating adipose tissue biology, since GIP receptors are highly expressed in adipocytes. Studies comparing GLP-1-only vs. dual-agonist effects commonly pair these two compounds.
Structural Considerations
GLP-2T's size (C₂₂₅H₃₄₈N₄₈O₆₈, MW ~4813 Da) is notably larger than GLP-1S (C₁₈₇H₂₉₁N₄₅O₅₉, MW ~4114 Da). This affects handling: use the same BAC water reconstitution protocol, but allow slightly more mixing time for GLP-2T to fully dissolve.
For Triple-Receptor Research
If your research focus extends to glucagon receptor (GCGR) co-activation alongside GLP-1 and GIP, consider also evaluating our GLP-3R (Retatrutide) — a GLP-1 / GIP / GCG triple agonist available in 5mg, 10mg, and 15mg vials.