Tirzepatide — sold as Mounjaro for type 2 diabetes and Zepbound for weight management — is a dual GIP/GLP-1 receptor agonist developed by Eli Lilly. For researchers working with tirzepatide peptide, this guide covers reconstitution, dosage escalation used in Phase 3 trials, and key sourcing criteria.
Tirzepatide Mechanism
Tirzepatide was the first approved dual incretin agonist — activating both GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide) receptors. GIP receptor activation augments the insulin secretory response and appears to reduce the nausea burden seen with pure GLP-1 agonists like semaglutide, which partly explains tirzepatide’s tolerability profile.
Phase 3 Dosing Protocol (SURMOUNT-1)
| Week | Dose (once weekly SC) |
|---|---|
| 1–4 | 2.5 mg |
| 5–8 | 5 mg |
| 9–12 | 7.5 mg |
| 13–16 | 10 mg |
| 17–20 | 12.5 mg |
| 21+ | 15 mg (maintenance) |
Reconstitution Notes
Research-grade tirzepatide is typically supplied lyophilized. Reconstitute with bacteriostatic water (1–2 mL per vial). Store at 2–8°C; use within 28 days. The peptide is stable at room temperature for up to 21 days once reconstituted, though cold storage extends viability.
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Try the Calculator →Sourcing Quality Standards
Tirzepatide is a complex 39-amino-acid peptide with a C18 fatty diacid moiety for albumin binding — synthesis quality varies significantly. Require HPLC ≥98% and mass spec confirmation at the correct molecular weight (4,813 Da). Prax Peptides tirzepatide is batch-tested with third-party HPLC and mass spec COAs available for every lot.
Prax Peptides supplies research-grade compounds with 99%+ purity, verified by independent third-party analysis.
⚠️ Research Use Only: All compounds referenced on this site are intended strictly for laboratory research purposes. They are not approved for human use or consumption by the FDA or any regulatory authority. This content is for informational purposes only and does not constitute medical advice.