NovaPep

Buy Tirzepatide Australia: Tirzepatide 2mg Research Vial (LY3298176)

$59AUD, GST included

In stock in Australia, batch certificate ready

Size: 2 mg vial

Certificate of analysis published for every batch
Third-party HPLC purity and MS identity testing
Dispatched same day before 3pm cut-off, tracked Australia-wide
Research use only, sold to adults aged 18 and over

Buy tirzepatide peptide online in Australia as a 2 mg research vial, tested for identity and purity on every lot. Tirzepatide peptide, held in Australia as a research reagent, is a synthetic chain of 39 amino acids, known as LY3298176 in development, that activates both the GIP and GLP-1 receptors. A C20 fatty diacid on a side chain allows it to bind albumin, and labs use it as the standard dual incretin reference in receptor and cell assays. Its reference identity is formula C225H348N48O68, molar mass 4813.5 g/mol and CAS 2023788-19-2. It is supplied as a sealed lyophilised 2 mg vial from local stock, listed within our metabolic peptides range. Mass spectrometry confirms identity and HPLC measures purity on every lot before it is released, and the certificate of analysis can be opened before checkout. If your study sets a dual agonist against a triple agonist on the same bench, compare it with retatrutide. No diluent ships with the powder, so add bacteriostatic water when you check out, and store the unopened vial at -20 °C, dry and away from light. This reagent is not Mounjaro or any other pharmacy medicine, and NovaPep sells it to adults 18 and older for in vitro laboratory research only.

For laboratory research use only. Not for human or veterinary use. Not TGA approved. See the NovaPep research use policy.

What Is Tirzepatide?

Tirzepatide is a synthetic peptide that mimics two gut hormones, GIP and GLP-1, which are released after a meal and signal the pancreas to release insulin. This dual action made the tirzepatide peptide the first of its class to complete development, and it is the reason every later multi-receptor agonist gets compared with it. You can order Tirzepatide online in Australia as a 2 mg research vial, and every lot ships with its own certificate.

This is the compound that emerged from Eli Lilly's incretin programme as the first single molecule built to engage both the GIP receptor and the GLP-1 receptor with high affinity. In the lab it addresses one focused question, which is what GIP receptor activity contributes on top of GLP-1 signalling. That is why so many research groups include a tirzepatide arm whenever they characterise a newer agonist.

Why target two hormones and not just one? Together, GIP and GLP-1 explain the incretin effect, in which glucose swallowed by mouth prompts much more insulin release than an equal amount of glucose given into a vein. GLP-1 analogues were already well known, but GIP had largely been dismissed, since people with type 2 diabetes show a reduced insulin response to it. Lilly wagered that GIP receptor activity would still contribute once combined with GLP-1, and the trial results suggest the bet paid off.

How Tirzepatide Works at the GIP and GLP-1 Receptors

Pharmacologists describe tirzepatide as imbalanced and biased, terms drawn from a 2020 JCI Insight paper by Willard and colleagues at Lilly. Imbalanced means it activates GIPR more completely than GLP-1R, and at the GIP receptor it acts much like the natural hormone. Biased refers to the GLP-1 receptor, where it prefers cAMP production to recruiting beta-arrestin, the adaptor protein that draws receptors back into the cell. As a result receptor internalisation is weaker than with native GLP-1, and in the paper's islet experiments this difference was associated with stronger insulin secretion.

The chain is based on a GIP-like sequence. Alpha-aminoisobutyric acid (Aib) occupies positions 2 and 13 to protect against DPP-4 cleavage, the C-terminus is amidated and lysine 20 carries a linker joined to the C20 fatty diacid. This lipid tail provides reversible albumin binding and a reported half-life of about five days.

Tirzepatide Research: What Studies Have Looked At

Clinical research was carried out through two large programmes, SURPASS in diabetes and SURMOUNT in obesity. SURMOUNT-1 (NEJM, 2022) enrolled 2,539 adults over 72 weeks and found a mean 20.9% drop in body weight at the highest dose, compared with 3.1% in the placebo group. SURMOUNT-5 later compared tirzepatide directly with semaglutide in 751 participants, reporting 20.2% versus 13.7% across the same 72 weeks. These are published results for the registered medicine and are presented here as research information. Our full head-to-head guide sets them beside the retatrutide figures. Labs planning similar studies can order Tirzepatide online in Australia, with identity and purity confirmed on every lot.

A practical tip for laboratories. Since tirzepatide leans so strongly toward GIP, testing it only in a GLP-1 receptor cell line will underestimate its activity. Profile it at both receptors and measure arrestin recruitment alongside cAMP where possible, otherwise the bias that defines this molecule will never appear in your results.

From LY3298176 to Mounjaro

Lilly researchers first described the molecule in 2018 under the code LY3298176, presenting it as an engineered dual agonist based on the GIP sequence rather than on GLP-1. In May 2022 the US FDA approved it as Mounjaro for type 2 diabetes. That made it the first GIP and GLP-1 dual agonist to be marketed anywhere in the world.

Tirzepatide Specifications

Product name	Tirzepatide (LY3298176)
Size	2 mg vial
Structure	Agonist of both the GIP and GLP-1 receptors, built on a backbone resembling GIP and acylated with a C20 fatty diacid
Peptide length	39 amino acids
Formula	C225H348N48O68
Molar mass	4813.5 g/mol
CAS	2023788-19-2
Presentation	Freeze-dried powder, sealed glass vial
Quality testing	Identity by mass spectrometry and purity by HPLC, with a certificate of analysis issued for each lot
In the box	A single vial holding 2 mg of lyophilised tirzepatide, with bacteriostatic water available separately
Storage conditions	-20 °C while sealed, dry and dark, then 2 to 8 °C after reconstitution
Stock status	In stock
Intended use	In vitro laboratory research only

Use tirzepatide as the dual agonist reference within a metabolic panel, either alone or next to retatrutide when your study needs the glucagon receptor isolated. A single fill size, one HPLC result for each lot and a published certificate keep your documentation brief.

The research product is compact, a single 2 mg glass vial with a green flip-off cap and a white label, containing a dry white cake of tirzepatide with no liquid and no other active ingredient.

Confirm three items on the certificate, a measured mass near 4813.5 g/mol, CAS number 2023788-19-2 and the HPLC purity value for the lot. All reports are stored in the COA library under the lot code on the label, so you can review yours before buying and file it later. Any supplier that wants to be seen as the best tirzepatide peptide company should make this check just as simple, and that is why we keep every previous lot online too.

Handling and Storage of Tirzepatide

Add bacteriostatic water to your order, as the vial contains only powder. Allow the glass to warm to room temperature, let the water run gently down the inside wall and swirl softly until the cake dissolves, without shaking. Putting 1 mL into the 2 mg vial gives 2 mg/mL, and our peptide calculator covers any other volume without a login, making it the best free peptide calculator for tirzepatide maths we can provide. Order Tirzepatide online in Australia and it travels by tracked Australia Post from our local stock.

While sealed, the vial keeps best at -20 °C in dry, dark conditions, and the powder can handle a short period at room temperature during shipping. Once in solution, store it at 2 to 8 °C, divided into aliquots so no portion goes through more than one freeze and thaw.

Tirzepatide Compared With Retatrutide and Cagrilintide

Retatrutide is the natural companion. Each peptide is 39 amino acids long, each is built on a GIP-like sequence and each has a C20 fatty diacid, but retatrutide also switches on the glucagon receptor. Testing the pair in parallel lets the difference between them reveal the glucagon contribution in your assay, and our retatrutide vs tirzepatide guide compares the two chains in detail.

Choose cagrilintide when you want the partner for tirzepatide to come from another hormone family. It acts at amylin and calcitonin receptors without any incretin activity, so a combination study can separate the two systems clearly. For labs deciding which peptide to stack with tirzepatide, these two between them cover the glucagon and amylin axes. If a ready-made solution fits your workflow better, the Tirzepatide Pen contains the same compound in a 3 mL cartridge.

Other Names for Tirzepatide

Suppliers list this compound as tirzepatide, under its development code LY3298176, or just as tirz. Some call it a twincretin or a dual incretin agonist, and all of these names refer to the same 39-residue chain registered as CAS 2023788-19-2.

The receptors have alternative names as well. GIP means glucose-dependent insulinotropic polypeptide, a hormone originally called gastric inhibitory polypeptide, and GLP-1 means glucagon-like peptide-1. Mounjaro is the brand registered in Australia and Zepbound is sold only in the US, and neither refers to this research vial.

Buy Tirzepatide Peptide Online in Australia

The 2 mg size makes sense because tirzepatide is usually the control. A comparator arm uses much less material than the lead compound, and a small vial is easy to use up within the 28 days a reconstituted solution is normally kept. The small fill keeps your reference arm affordable.

Labs asking about the best peptides to stack with tirzepatide in a research order usually compare it with retatrutide or cagrilintide, each ordered as its own vial.

For a longer series, order several vials together and request a single lot where stock permits, so one certificate covers them all and your records remain simple. The best place to buy tirzepatide peptides online is a supplier that lets you see the lot report first, which is why we post every certificate before any vial is sold. Purchases are limited to adults 18 years and over, who confirm their age before paying.

NovaPep has no shop or pickup counter. We trade online and supply every state and territory from stock held in Australia, so a lab buying research peptides in Perth gets exactly the same lot as a lab in Brisbane. Orders paid by 3pm on a business day are dispatched the same day, and our delivery information page explains services and cut-off times.

The legal position of tirzepatide in Australia, and what our vial is not

Australia has a registered medicine containing the same ingredient, which puts tirzepatide in a different position from most of the peptides we stock. Mounjaro is entered on the ARTG, as of October 2026, as a medicine available only on prescription, indicated for adults with type 2 diabetes that is not adequately controlled. Since the TGA ruled on it in September 2024, it is also indicated for chronic weight management. The PBS does not subsidise it. In March 2026 the PBAC recommended a diabetes listing, but in April 2026 Lilly informed the government it would not go ahead at the price offered.

In Australia, tirzepatide is legal as a registered medicine dispensed through a pharmacy on prescription. The vial sold here is something else altogether. It is research-grade tirzepatide without an ARTG entry of its own, intended for receptor and cell assays, and the TGA has not evaluated it. NovaPep keeps it in Australian stock for laboratory research, available online to adults 18 and over, and never for human or veterinary use. For labs wanting tirzepatide as a dual agonist reference, the 2 mg fill is intentionally small, and our comparison of retatrutide and tirzepatide trial data explains why it is the standard control arm.

Be clear about what the vial is. Australian pharmacies dispense registered tirzepatide on prescription, and that medicine is a regulated product in its own right. What we sell is a reagent of research grade intended for cell and receptor assays, it holds no therapeutic approval, and it must never be administered to people or animals. See the metabolic peptides category for the compounds most often bought with it.

More on Buying Tirzepatide in Australia

How do laboratories use tirzepatide?

Labs run it as the benchmark dual incretin agonist when studying receptor binding, intracellular signalling and cell models. Its extensive publication history makes it the standard comparator when a team characterises a newer compound such as retatrutide. It is restricted to in vitro research and is never for people or animals.

Tirzepatide at a Glance

An agonist of both GIP and GLP-1

A chain of 39 amino acids that activates two incretin receptors together, carrying a C20 fatty diacid whose albumin binding lengthens its half-life.

Order the 2 mg vial

A single sealed vial of lyophilised powder. The vial arrives without diluent, so add bacteriostatic water to the same order.

For research only

Used in receptor pharmacology, cell signalling and as a comparator arm for newer incretin agonists. It is a reagent, not the pharmacy product, and must never be used in humans.

Pairs with retatrutide

The same length and GIP-like base, without the glucagon receptor. Comparing both isolates that third pathway.

Freeze, then refrigerate

Keep the sealed vial in the freezer and the solution in the fridge, stored in aliquots so nothing is refrozen.

Every lot tested

Identity is checked by mass spectrometry and purity by HPLC on each tirzepatide lot, with all reports posted in the COA library.

Tirzepatide FAQ

What is tirzepatide and how does it work?

Tirzepatide is a 39 residue peptide built on a GIP-like sequence that activates both the GIP and GLP-1 receptors. It activates GIPR more completely than GLP-1R. At the GLP-1 receptor it favours cAMP over beta-arrestin recruitment, so receptor internalisation is weaker than with native GLP-1.

How should tirzepatide be stored?

Keep the sealed vial at -20 °C in dry, dark conditions. The powder can handle a short period at room temperature during shipping. Once in solution, store it at 2 to 8 °C in aliquots so no portion goes through more than one freeze and thaw.

Is NovaPep's tirzepatide the pharmacy medicine?

No. Registered tirzepatide is only supplied on prescription through Australian pharmacies. What we sell is a reagent for in vitro bench work, made to research grade and holding no therapeutic approval, and it cannot replace the prescription product. Our research use policy prohibits any use in people or animals.

What are the best peptides to pair with tirzepatide in a combination study?

Retatrutide is the best peptide to stack with tirzepatide for most labs, because glucagon is the only receptor that differs between the two. Cagrilintide is the other popular option, as it acts through amylin and calcitonin receptors with no incretin activity. Add either to the same cart so both arms arrive together with their certificates side by side.

What is the best peptide to take with tirzepatide?

If the question is about personal use, NovaPep cannot answer it. Our tirzepatide is a 2 mg research vial, not the pharmacy medicine, and we give no dosing or combination advice for people. For lab comparisons, see the pairing answer above.

What is the process to order tirzepatide peptide online in Australia?

Put the 2 mg vial in your cart from this page, and it will be sent from our Australian stock. Payments that clear before 3pm on a business day are dispatched the same day with order tracking. The best place to buy tirzepatide peptide online shows its lot data first. Check the lot certificate before you pay and add bacteriostatic water to the order, since the vial comes as dry powder.