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Tirzepatide vs Semaglutide
Semaglutide is a single GLP-1 receptor agonist — the most established incretin peptide. Tirzepatide adds a second target, the GIP receptor, making it a dual agonist. Both are weekly peptides; here is how they line up on mechanism, cadence, and half-life.
Tirzepatide
Dual agonist — GLP-1 / GIP
Dual incretin agonist — combines two receptor pathways in one molecule.
View Tirzepatide →Semaglutide
Single agonist — GLP-1
Single GLP-1 receptor agonist — the most established of the three.
View Semaglutide →Side by side
| Tirzepatide | Semaglutide | |
|---|---|---|
| Receptor targets | GLP-1 and GIP receptors | The GLP-1 receptor only |
| Mechanism class | Dual incretin agonist — combines two receptor pathways in one molecule. | Single GLP-1 receptor agonist — the most established of the three. |
| Typical research cadence | Once-weekly subcutaneous in most research protocols. | Once-weekly subcutaneous in most research protocols. |
| Approx. half-life | ~5 days (supports weekly dosing) | ~7 days (supports weekly dosing) |
| Domain | Metabolic | Metabolic |
The short version
Semaglutide (single GLP-1) is the established baseline; tirzepatide (dual GLP-1/GIP) adds a second receptor pathway. Handling, storage, and weekly dosing are the same, so the decision for a research protocol turns on the receptor profile you intend to study.
Dosage calculator
Convert any target dose into exact syringe units for your vial.
Lab testing & COAs
How every lot is verified — third-party HPLC, ≥98% purity.
Protocols
Goal-oriented stacks mapped to specific compounds.
Frequently asked questions
What is the difference between tirzepatide and semaglutide?
Semaglutide activates the GLP-1 receptor only. Tirzepatide is a dual agonist that activates both the GLP-1 and GIP receptors. Both are dosed once weekly in most research protocols.
Is tirzepatide stronger than semaglutide?
They differ in mechanism rather than a simple strength scale — tirzepatide engages an additional receptor (GIP). Comparative research outcomes are context-dependent, so we describe the mechanism here and leave interpretation to your protocol and the literature.
Can I use the same reconstitution math for both?
Yes — the reconstitution and syringe-unit math is identical; only the milligram amounts differ. Enter your vial size and target dose in the dosage calculator to get the exact units to draw.
Disclaimer
This comparison describes receptor mechanism and handling for research context only. It is not medical advice and makes no claim of safety or efficacy. All compounds are sold for research use only. Consult a licensed physician before using any peptide compound outside controlled research.