Tirzepatide is built on a native human GIP peptide backbone with targeted amino acid substitutions and lipid conjugation to optimize receptor affinity and metabolic stability:
- Aib² (2-aminoisobutyric acid) substitution confers full resistance to DPP-4 enzymatic cleavage, eliminating rapid plasma degradation of native incretin peptides.
- Aib¹³ modification enhances balanced dual agonism across GLP-1 and GIP receptors, avoiding biased single-target activation.
- C-terminal amidation blocks carboxypeptidase breakdown, extending in-vitro and in-vivo half-life.
- C20 fatty diacid linker conjugated to lysine residue enables reversible serum albumin binding, delivering a circulating half-life of approximately 5 days in mammalian models.
| Property | Value |
|---|---|
| Name and synonyms | Tirzepatide, Mounjaro peptide, dual GLP-1/GIP agonist |
| PubChem CID | 161297564 |
| CAS number | 2023788-19-2 |
| Molecular formula | C225H348N48O68 |
| Molecular weight | 4813.5 g/mol |
| Peptide length | 39 amino acids |
| Compound class | Synthetic dual incretin receptor agonist |
| Primary targets | GLP-1R, GIPR |
| Receptor potency (human EC50) | GIPR 0.03 nM; GLP-1R 0.42 nM |
| Half-life | Approximately 5 days |
| Physical form | White to off-white lyophilised powder |
| Solubility | Bacteriostatic sterile water, DMSO, neutral PBS pH7.2 |
| Original developer | Eli Lilly and Company |
| Purity | ≥99% HPLC (COA attached per batch) |
| Vial sizes available | TR5, TR10, TR15, TR20, TR30, TR40, TR50, TR60, TR100 |
Tirzepatide is one of the most widely studied incretin research peptides, supported by large-scale Phase 2 and Phase 3 clinical trial datasets published in top metabolic journals. Core published research programs include the SURMOUNT clinical series, which documented dose-dependent body weight reduction and HbA1c lowering across overweight, obese and diabetic subject cohorts.
The SURMOUNT-1 randomized, double-blind, placebo-controlled trial evaluated weekly tirzepatide doses over 72 weeks in participants with BMI ≥30 kg/m². At the maximum tested dose, mean body weight reduction reached 22.5% from baseline, establishing the peptide’s robust dual-receptor metabolic activity and forming the foundational reference for modern obesity peptide research.
Zypep Peptides supplies bulk wholesale tirzepatide powder to research labs, cosmetic R&D institutions and preclinical CROs worldwide. Contact our online inquiry dialog on zypep.com to request batch COA, bulk pricing and global shipping terms. All products marked FOR RESEARCH USE ONLY.






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