Reconstitution
Bacteriostatic Water 3mL
$10
Laboratory research material only. Not for human or animal consumption.Laboratory research material only. For qualified in-vitro and laboratory research use. Not for human or animal consumption, injection, or therapeutic use. Not a medicine, supplement, or cosmetic.
Weight & Metabolism · 5mg
Retatrutide 5mg
CAS 2381089-83-2
$89
1
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Sealed Under Argon
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The Retatrutide 5mg vial (also written as Reta, the Reta peptide, or mistyped Retatrude, R3ta peptide, and Reda peptide) is the smallest format of the triple-agonist research peptide studied across the GLP-1, GIP, and glucagon receptor pathways at once. It is the entry vial in the retatrutide range: half the material of the 10mg format in a single lyophilised unit, which makes it the sensible choice for a first reference batch, a short protocol, or a comparison run where a full 10mg vial would sit unused. Same compound and same CAS reference, 2381089-83-2, as the larger vials.Where earlier metabolic compounds engaged one receptor (the single-agonist, GLP-1 only class) or two, retatrutide is studied for reaching all three simultaneously. That combined receptor profile, rather than any single pathway, is what put it at the centre of current appetite-signalling and metabolic research. In preclinical and in-vitro settings it is investigated for how simultaneous receptor engagement influences appetite signalling, glucose-handling models, and body-composition pathways, and the literature treats triple-agonist compounds as tools for studying signalling rather than as finished products.The 5mg vial divides into five 1 mg reference aliquots, so a shorter investigation block finishes a vial rather than leaving reconstituted material to sit. Researchers who already know their protocol will find better per-milligram value in the Retatrutide 10mg vial, and better again in the Retatrutide 20mg vial for sustained work. Anyone comparing receptor profiles across compounds may find our library guides on retatrutide versus tirzepatide and retatrutide versus semaglutide useful before choosing a format.Every 5mg vial ships lyophilised (freeze-dried) with an independently verified batch certificate at a guaranteed floor of ≥98% purity, verifiable on the batch verification page using the batch number printed on the label. Reconstitute with bacteriostatic water on arrival: add it slowly down the inside wall of the vial, swirl gently to dissolve, and never shake. Store the unopened vial refrigerated at 2 to 8°C; once reconstituted, keep the solution refrigerated and avoid repeated freeze-thaw cycles.Buying retatrutide in Australia is domestic and direct: free Australia Post Express shipping Australia-wide with no minimum spend, dispatch from within Australia within two business days of confirmed payment (most within 24 hours), and tracking on every parcel. There are no customs delays and no international freight uncertainty. Pay by card, PayPal, or PayID; every vial is sealed under argon with a 24-hour payment reservation on your stock. Supplied strictly as a research material for lawful laboratory and in-vitro use, not for human or veterinary consumption.
Formal Name
Retatrutide
CAS Number
2381089-83-2
Purity
99.6% · batch-tested
Description
Triple-agonist research peptide targeting GLP-1, GIP and glucagon receptor pathways, positioned for metabolic and appetite-signalling research.
Research Focus
Metabolic research, appetite signalling, body-composition pathways and glucose-handling models.
Suggested Use
Reference plan: 1 mg aliquots on a once-weekly research cadence. The smallest format, suited to a first reference batch where a protocol has not yet been fixed.
Doses per Vial
5 x 1 mg reference aliquots.
Concentration
1 mg per reference aliquot from a 5 mg vial.
Notes
Investigational compound; strongest human data are obesity trials, not general wellness use.
Monthly Ranking
#2 most popular research peptide
Retatrutide carries 175 indexed publications, 34 registered trials, 6 with Australian sites, 39,578 monthly readers on Wikipedia. Research activity sits at 73 papers in the past twelve months against 57 the year before.
Why It's Searched
High-intent searches for GLP-1, GIP, and glucagon-pathway research peptides.
Evidence Standing
175 papers, 73 this year · 34 trials, 6 in Australia · 39,578 readers (-29%) · S tier
retatrutide australiaretatrutide peptideretatrutide 10mgretatrutide 20mg
Updated 2 August 2026
Prepared with care, sealed under argon, and stored at 2–8°C until dispatch. Reconstitute with Bacteriostatic Water before use. Full preparation and storage guidance included with your order.
Retatrutide 5mg arrives sealed and research-ready, with a written preparation and storage card in every order. Prepare and store it as set out below, and use the reconstitution calculator to work out your concentration and draw volume before you begin.
Step 01
On arrival
Your Retatrutide 5mg vial arrives securely packaged. Refrigerate it sealed at 2–8°C until you are ready to prepare.
Step 02
Prepare gently
Add Bacteriostatic Water slowly against the vial wall, then swirl gently. Never shake.
Step 03
Store correctly
Once prepared, aliquot and freeze at −20°C. Avoid repeated freeze–thaw cycles.
4.8
4 reviews · 31 verified orders
Elise V.
Verified Buyer · Sydney NSW
“Ordered the smaller vial to try the supplier first. Sealed properly, packed well, and dispatched the same day.”
Cameron J.
Verified Buyer · Brisbane QLD
“Good size for a first order and the labelling was clear, SKU and batch both printed. Tracking updated the whole way.”
Freya L.
Verified Buyer · Perth WA
“Arrived in perfect condition with the prep notes included. A day behind the estimate to my postcode, but tracked throughout.”
Jarrah M.
Verified Buyer · Darwin NT
“Discreet box, immaculate vial, and support answered a question about storage within the hour.”
- What is Retatrutide?
- Retatrutide is a triple-agonist research peptide that targets the GLP-1, GIP, and glucagon receptor pathways simultaneously. This tri-receptor activity is what separates it from earlier compounds like semaglutide (GLP-1 only) and tirzepatide (GLP-1/GIP). It is supplied as a lyophilised powder for in-vitro laboratory research purposes only, not for human use.
- Can I buy Retatrutide at Chemist Warehouse in Australia?
- No. Retatrutide is not available as a commercial pharmaceutical product at retail pharmacies like Chemist Warehouse, Priceline, or any Australian pharmacy. It is an investigational research compound that has not been approved for human use by the TGA. Polaris Research supplies Retatrutide exclusively as a lyophilised powder for in-vitro laboratory research purposes.
- Can Australian compounding pharmacies supply Retatrutide?
- Retatrutide is still an investigational compound, not an approved commercial medicine currently available to the public in Australia. Polaris Research does not supply Retatrutide as a compounded prescription product or pharmacy medicine, we supply research-grade lyophilised powder for lawful in-vitro laboratory research only. Lilly states that Retatrutide remains in Phase 3 clinical trials, with public launch dependent on trial completion and regulatory approval.
- Where to buy Retatrutide in Australia?
- Retatrutide is available through Polaris Research with fast domestic Express Delivery to all Australian states and territories. Every vial is dispatched from within Australia, no customs delays, no international freight uncertainty. Each batch is independently third-party tested to ≥98% purity, with the Certificate of Analysis verifiable on our batch verification page.
- What is the cost of Retatrutide in Australia?
- Retatrutide 10mg is available from Polaris Research. Every order includes free Australia Post Express Delivery Australia-wide and an independently verified batch certificate. The 20mg vial offers better per-milligram value for longer research blocks.
- How to get Retatrutide online?
- Ordering is straightforward, add Retatrutide to your cart on the Polaris Research website and complete checkout. All orders are fulfilled domestically and shipped with tracking to any address across Australia. Each batch is third-party tested at ≥98% purity, with the Certificate of Analysis verifiable on our batch verification page.
- What does the research show about Retatrutide?
- Retatrutide is the most discussed triple-agonist in current metabolic research. Its three-receptor reach (GLP-1, GIP, and glucagon) covers appetite signalling, insulin sensitivity, and energy expenditure, a combination no single or dual agonist matches. It is studied as the benchmark compound for next-generation metabolic and body-composition research. For a head-to-head comparison, see our Retatrutide vs Tirzepatide library guide.
- How do I reconstitute the vial?
- Reconstitute by adding Bacteriostatic Water slowly down the inside wall of the vial, never directly onto the powder. Swirl gently to dissolve; do not shake. Once reconstituted, keep the solution refrigerated and avoid repeated freeze-thaw cycles. For a step-by-step walkthrough, see our Peptide Reconstitution Guide.
- How should I store it?
- Store the unopened lyophilised vial refrigerated at 2–8°C, kept dark and upright. Once reconstituted, keep the solution refrigerated and use it within a few weeks. Never re-freeze a reconstituted solution, ice crystals damage the compound. A clear, particle-free liquid is the sign of a clean reconstitution.
- How is Retatrutide 5mg verified?
- Every batch of Retatrutide 5mg is independently third-party tested to 99.6% purity by HPLC and mass spectrometry at an accredited laboratory. The batch certificate ships with your order and can be verified on our batch verification page using the batch number on the vial label. We never ship a vial without a matching certificate.
- Is Retatrutide 5mg shipped Australia-wide?
- Yes, shipping is always free: every order includes free Australia Post Express Delivery, Australia-wide, with tracking. Orders dispatch within 2 business days of confirmed payment, with most dispatched within 24 hours (weekends excluded). A 24-hour payment reservation holds your stock from the moment you order.
- Can I pay with Afterpay or another buy now pay later plan?
- Yes. Afterpay, Zip and Klarna are all offered on Stripe's secure payment page at checkout, alongside card, Apple Pay and Google Pay. Choose the Afterpay, Card & Apple Pay option, then pick your provider on the payment page, where the plan is shown and approved before your order is confirmed. We add no surcharge for paying in instalments, and the price is the same as paying in full. Your order then ships on the normal schedule, most within 24 hours of confirmed payment, so there is no wait for the instalments to finish. Approval and the amount available to you are the provider's decision, not ours. If you would rather pay in full, PayID / Osko bank transfer and PayPal are both offered at checkout.
Educational and product-logistics information only. Nothing here is medical advice or a therapeutic claim.
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Related Reading
From the library
Cost Guide · No. 14
Retatrutide Cost Australia 2026
Research-grade retatrutide pricing per vial, per larger format, and per milligram, with a comparison to what a future pharmacy supply might look like.
Read →Comparison · No. 06
Retatrutide vs Tirzepatide
Two of the most studied metabolic peptides compared, receptor targets, research context, and what the difference means in practice.
Read →Comparison · No. 22
Retatrutide vs Semaglutide
A single GLP-1 agonist next to a GLP-1, GIP, and glucagon triple agonist, and what the receptor reach means for research.
Read →Other Quantities
Other formats & sizes
Also Searched As·Retatrutide is also searched as Reta peptide, Reta, R3ta peptide, Reda peptide, Ratatouille peptide, Retatrude, Retatrutide peptide, Skinny jab, Triple G peptide.