Buy Retatrutide Australia | Research Grade, COA Tested

Peptides Collective supplies research-grade retatrutide (LY3437943) in 10mg and 20mg vials, dispatched from Perth to researchers Australia-wide. Every batch is third-party tested and the Certificate of Analysis is available on our COA page.

What Is Retatrutide?

Retatrutide (LY3437943), often shortened to "reta", is a synthetic peptide developed by Eli Lilly. It is a triple hormone receptor agonist: it activates the GLP-1, GIP and glucagon receptors. That makes it different from semaglutide (GLP-1 only) and tirzepatide (GLP-1 + GIP), and it is one of the most closely watched metabolic peptides in current research.

In a 48-week phase 2 trial published in the New England Journal of Medicine (2023), the highest-dose group lost an average of about 24% of body weight. Phase 3 trials (the TRIUMPH program) are ongoing.

Retatrutide vs Tirzepatide vs Semaglutide

For a deeper comparison, read our guide: GLP-1s explained: semaglutide vs tirzepatide vs retatrutide.

Research Applications

• Metabolic function, glucose regulation and insulin sensitivity research
• Appetite, satiety and energy-expenditure signalling studies
• Body composition and adipose tissue research
• Liver fat (hepatic steatosis) models
• GLP-1 / GIP / glucagon receptor synergy studies

Why Researchers Choose Peptides Collective

• Third-party tested: every batch has its own COA, ≥98% purity by HPLC
• Australian stock: packed in Perth, WA, ships within 24 hours
• Fast national delivery: express and standard shipping Australia-wide
• Real local support: Perth-based team, Mon–Sat 8am–7pm AWST

Reconstitution & Storage

Retatrutide is supplied as a lyophilised (freeze-dried) powder. Reconstitute with bacteriostatic water: add the water slowly down the vial wall and swirl gently. Don't shake. Full steps are in our How to Reconstitute Peptides guide.

Store unopened vials at 2–8°C, or at −20°C for long-term storage. Avoid repeated freeze-thaw cycles. Once reconstituted, keep refrigerated and use within 28 days.

Frequently Asked Questions

Where can I buy retatrutide in Australia?

You can order retatrutide 10mg and 20mg online from Peptides Collective. Orders ship from Perth, WA to all Australian states.

What is retatrutide used for in research?

It is studied for metabolic research: weight regulation, glucose control, appetite signalling and liver fat, because it acts on GLP-1, GIP and glucagon receptors at the same time.

Is retatrutide the same as tirzepatide?

No. Tirzepatide is a dual GLP-1/GIP agonist. Retatrutide adds glucagon-receptor activity, making it a triple agonist.

What purity is your retatrutide?

Every batch is independently tested to ≥98% purity. COAs are published on our COA page.

How long does shipping take?

We dispatch within 24 hours from Perth. Standard delivery is 3–7 business days nationally, and express is available at checkout. See shipping.

Do I need bacteriostatic water?

Yes. Retatrutide is a powder and must be reconstituted. We stock BAC water so you can order it together.

Research use only. All products supplied by Peptides Collective are intended strictly for in-vitro laboratory and research purposes. Not for human consumption.