What Is Tirzepatide Peptide?
Tirzepatide is a synthetic peptide developed by Eli Lilly under the research code LY3298176. It was the first dual incretin agonist to reach regulatory approval, activating two receptors with a single molecule: the receptor for glucose-dependent insulinotropic polypeptide (GIP) and the receptor for glucagon-like peptide-1 (GLP-1). That dual action is why the tirzepatide peptide is described as a "twincretin".
The peptide chain is modelled on the native GIP sequence and carries a fatty acid side chain that binds albumin in circulation, extending its half-life to around five days. Because it has been studied so extensively, tirzepatide has become the reference compound in incretin research: new agonists, including retatrutide, are routinely compared against it.
How Tirzepatide Works: GIP and GLP-1 Receptor Activity
- GLP-1 receptor. Stimulates glucose-dependent insulin secretion, slows gastric emptying and signals satiety. This is the receptor targeted by semaglutide and the earlier GLP-1 analogues.
- GIP receptor. The second incretin pathway, involved in insulin release and in how adipose tissue handles lipids. Tirzepatide binds the GIP receptor strongly, which is the main difference between it and a GLP-1-only compound.
Combining both pathways in one peptide lets a study separate what GIP activity adds on top of GLP-1 activity, which is why tirzepatide is so often used as a comparator. It does not act on the glucagon receptor; that third target is what retatrutide adds.
Tirzepatide Peptide Research
Tirzepatide has one of the largest bodies of published research of any incretin compound, including large clinical programmes run by its developer and head-to-head studies against semaglutide. Browse the citations, with links to each paper, in our tirzepatide research library.
Tirzepatide vs Retatrutide, Semaglutide and Cagrilintide
| Compound | Receptor targets | Class |
|---|---|---|
| Semaglutide | GLP-1 | GLP-1 receptor agonist |
| Tirzepatide | GIP and GLP-1 | Dual agonist |
| Retatrutide | GIP, GLP-1 and glucagon | Triple agonist |
| Cagrilintide | Amylin and calcitonin receptors | Long-acting amylin analogue |
Research designs often pair these compounds: tirzepatide as the dual-agonist comparator for retatrutide, or alongside cagrilintide to study amylin and incretin pathways together. Our guide to retatrutide vs tirzepatide sets out the differences in detail, and the full range sits in metabolic research peptides.
Buy Tirzepatide Peptide in Australia
Chainwell Peptide supplies tirzepatide peptide in Australia to laboratories and independent researchers. Before you buy tirzepatide from any research supplier, check that the fill is stated in milligrams, that each vial carries a lot number, and that the certificate of analysis for that lot is available. Ours can be checked on the COA lookup page.
- Same-day dispatch on orders paid before 3pm AEST on a business day.
- Australia-wide delivery by standard or express post, from Sydney and Melbourne metro to Hobart, Darwin and country NSW, VIC, QLD and WA.
- PayID or bank transfer, with your order number as the payment reference.
- Two formats: this 2mg lyophilized vial, or the pre-filled Tirzepatide Pen.
Tirzepatide Price and Cost in Australia
The current tirzepatide price for this research vial is shown at the top of this page, with GST included, and shipping is charged once per order. When comparing tirzepatide cost in Australia, compare research suppliers on cost per milligram and on what stands behind the vial: a lot-matched certificate of analysis and fast local dispatch.
If you are looking for the prescription medicine rather than a research compound, that is a different product with its own pricing, supplied only through doctors and pharmacies. Chainwell Peptide does not supply medicines.
Tirzepatide 2mg Specifications
| Compound | Tirzepatide (LY3298176) |
|---|---|
| Class | Dual receptor agonist: GIP and GLP-1 |
| Vial size | 2mg |
| Form | Lyophilized (freeze-dried) powder |
| Container | 3 mL clear glass vial, rubber stopper, flip-off cap |
| Label | Product, strength, lot number, expiry, research-use statement |
| Testing | Identity and purity by an independent laboratory, per lot |
| Diluent | Bacteriostatic water, sold separately |
| Storage | Minus 20 °C long term, 2 to 8 °C short term, protect from light |
| Shipping | Standard or express post, Australia-wide |
Reconstitution and Storage
Tirzepatide arrives as a dry cake and is dissolved in bacteriostatic water before use. Run the water slowly down the inside of the vial and swirl rather than shake. Keep unopened vials frozen at minus 20 °C, or refrigerated at 2 to 8 °C for use within a few weeks, and use a reconstituted vial within 28 days. Our reconstitution guide and calculator and storage guide cover handling in detail.
Research Use Only
Chainwell Peptide tirzepatide is a research compound for laboratory and in vitro use only. It is not a medicine, it is not the prescription product sold in pharmacies, and it is not for human or veterinary use. We do not provide dosing advice. By ordering you agree to our terms and conditions and research use only statement.
Tirzepatide tools and guides
Tirzepatide FAQ
What is tirzepatide peptide?
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Tirzepatide is a synthetic peptide developed by Eli Lilly under the code LY3298176. It is a dual agonist of the GIP and GLP-1 receptors and is widely used as the comparator compound in incretin research. Chainwell Peptide supplies it as a 2mg lyophilized research vial with a lot-matched certificate of analysis.
Where can I buy tirzepatide peptide in Australia?
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You can buy tirzepatide peptide in Australia from Chainwell Peptide as a 2mg lyophilized research vial or a pre-filled research pen. Each lot carries a lot number matched to an independent certificate of analysis, and orders paid before 3pm on a business day ship the same day by standard or express post.
How much is tirzepatide in Australia?
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The price of our tirzepatide research vial is shown at the top of this page, including GST, with shipping charged once per order. Prescription tirzepatide is a separate medicine priced by pharmacies, and Chainwell Peptide does not supply it. Our vial is sold for laboratory research use only.
Is Chainwell Peptide tirzepatide the same as Mounjaro?
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No. Mounjaro is a prescription medicine made by Eli Lilly and supplied through doctors and pharmacies. Chainwell Peptide tirzepatide is a research-grade compound supplied as a lyophilized vial for laboratory use only. It is not a medicine and is not for human or veterinary use.
Is tirzepatide available in Australia?
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Tirzepatide is registered in Australia as a prescription medicine, available only through a doctor. Separately, research-grade tirzepatide is available to laboratories from Chainwell Peptide as a 2mg lyophilized vial, strictly for research use and not for human or veterinary use.
