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Retatrutide
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At 8.00 mg/wk — select pack size
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Lab-direct quality — full packs or single-vial samples
Every batch ships straight from the lab that synthesises it — sealed, tamper-evident, and HPLC-verified to >99% purity with a batch-linked Certificate of Analysis. View the batch Certificate of Analysis → Buying direct means you pay the lab-direct rate on every vial, with nothing stacked on top.
Order a full sealed 10-vial research pack for a complete study supply, or add a single-vial sample alongside your pack to trial a new compound first. Same lab, same batch, same verified purity — scaled to whatever your research needs.
What It's Researched For
In plain terms, retatrutide is the experimental triple-target compound studied for the biggest weight and liver-fat effects in this family. It is still in trials and is not an approved medicine. Here is what that looks like across the research.
Weight research
In clinical trials, studied for the largest average weight reduction reported in this class so far, with the effect still building at the end of long studies.
Calorie burn & metabolism
Research explores a third pathway that nudges the body to burn more energy, not just eat less, which sets it apart from single and dual compounds.
Liver-fat research
Human studies investigate large reductions in fat stored in the liver, among the biggest reported for any compound in this family.
Blood-sugar control
Trials in people with type 2 diabetes look at meaningful blood-sugar improvement alongside weight loss.
Once-a-week convenience
Designed to stay active for roughly six days, so research uses a single weekly injection.
Overview
Retatrutide is a triple receptor agonist of the GLP-1 / GIP / glucagon system, with the largest body-composition effects reported for any incretin-class peptide in published research.
Retatrutide is an engineered 39-amino-acid peptide that engages three receptors at once: GLP-1 (satiety and insulin), GIP (incretin amplification), and glucagon (hepatic energy expenditure). The triple-action profile is sometimes called a "GGG" tri-agonist.
The design builds on the dual GLP-1/GIP class by adding glucagon receptor activation. Glucagon receptor activation increases hepatic thermogenesis and energy expenditure, something appetite-suppression alone cannot do, which is part of why Retatrutide has produced the largest body-composition shifts seen in this class.
Retatrutide is supplied here as a lyophilised powder for in-vitro and preclinical research only. It is not an approved medicine in any jurisdiction.
Mechanism of Action
Retatrutide simultaneously activates the GLP-1, GIP, and glucagon receptors, combining appetite suppression with direct hepatic energy expenditure — the mechanism associated with the large weight and liver-fat reductions reported in clinical trials.
Jastreboff et al. (NEJM, 2023) published the landmark Phase 2 data: 24.2% mean weight loss at 48 weeks with the 12 mg dose, with more than 90% of participants losing at least 10%. Sanyal et al. (Nature Medicine, 2024) then reported up to 82.4% reduction in liver fat in MASLD trials - a remarkable number for any intervention. The pivotal Phase 3 trial TRIUMPH-1 (NCT05929066, 2025) reported 28.3% mean weight loss at 80 weeks with the 12 mg dose (45.3% of participants ≥30%), confirming the Phase 2 trajectory. The peptide is hepatically metabolised without CYP involvement, so drug-drug interactions are minimal. Steady state is reached in 3-4 weeks of weekly dosing.
Common Questions People Are Asking
What is retatrutide?
Retatrutide is an investigational triple agonist — it activates the GLP-1, GIP and glucagon receptors — developed by Eli Lilly and still in clinical trials (not approved anywhere). Retatrutide is the research-grade form of this retatrutide peptide, supplied as a lyophilised powder strictly for in-vitro and preclinical laboratory research. It is not an approved medicine and is not for human use.
What does retatrutide do?
In published research retatrutide activates three receptors at once — GLP-1 and GIP (satiety, insulin secretion, adipose effects) plus glucagon (hepatic energy expenditure and liver-fat clearance). The triple mechanism is what distinguishes it from dual (tirzepatide) and single (semaglutide) agonists. These are research findings for the molecule, not human-use guidance; Retatrutide is supplied for research only.
Is retatrutide FDA approved?
No. Retatrutide is still in clinical trials and is not approved by the FDA, EMA, or any other regulator. Retatrutide is an unapproved, research-grade lyophilised powder supplied for laboratory research use only — not for human consumption.
Is retatrutide safe?
Retatrutide is investigational; its safety is still being characterised in clinical trials and is not established for general use. Research-grade Retatrutide is not a sterile approved medicine and carries no human safety assurances. New-U supplies it for laboratory research only and makes no human-use or safety claims.
How much bacteriostatic water do you mix with 10 mg of retatrutide, and how is it reconstituted?
For laboratory preparation, concentration in mg/mL equals the vial mass in mg divided by the millilitres of diluent added — e.g. a 10 mg vial reconstituted with 1 mL of bacteriostatic water gives 10 mg/mL, or with 2 mL gives 5 mg/mL. Keep the reconstituted vial refrigerated at 1–6 °C and protected from light. This is preparation math only; New-U provides no human-use dosing guidance.
How is Retatrutide different from Tirzepatide or Semaglutide?
Semaglutide targets one receptor (GLP-1), Tirzepatide targets two (GLP-1 and GIP), and Retatrutide targets three (GLP-1, GIP, and glucagon). The glucagon arm is what drives the additional hepatic thermogenesis and liver-fat clearance that set Retatrutide apart in published research.
Why is the glucagon receptor useful here? Glucagon raises blood sugar, right?
It does, but at the right intensity and in combination with GLP-1, glucagon receptor agonism stimulates hepatic energy expenditure and fat oxidation without significant net glucose elevation. The GLP-1 arm offsets any glycemic downside while the glucagon arm delivers unique energy-balance effects.
Is Retatrutide an approved medicine?
No. Retatrutide is supplied for in-vitro and preclinical research only and is not approved as a medicine in any jurisdiction.
What is the typical research dose escalation?
Published research protocols use a step-up schedule from 1 mg weekly, doubling over several weeks to 2 mg, 4 mg, 8 mg, and ultimately 12 mg. The gradual escalation is designed to minimise GI signals as systems adapt to triple-receptor activation.
Retatrutide vs tirzepatide — which showed more weight loss in research?
In their respective obesity programmes the triple agonist reported larger mean reductions: retatrutide reached about 24.2% at 48 weeks in Phase 2 (NEJM 2023) and 28.3% at 80 weeks in Phase 3 TRIUMPH-1, while tirzepatide reported about 20.9% at 72 weeks in SURMOUNT-1. The difference is widely attributed to retatrutide's added glucagon-receptor arm, which raises energy expenditure on top of appetite suppression. These are cross-trial descriptive comparisons, not head-to-head results, and both compounds are supplied only as research-grade material for laboratory use, not for human use.
How is retatrutide reconstituted and stored?
Keep the lyophilised powder at −20 °C in the freezer. Reconstitute with bacteriostatic water directed down the vial wall and swirl gently rather than shaking; the in-solution concentration in mg/mL equals the vial mass divided by the millilitres of diluent added. Refrigerate the reconstituted vial at 1–6 °C, protect it from light, and avoid repeated freeze-thaw cycles, which can damage the C20 fatty-acid tail. This is laboratory-handling guidance only — not a human-use protocol.
What happens when you stop taking GLP-1s?
Across the published GLP-1 literature, withdrawal of a GLP-1 receptor agonist is consistently followed by the return of appetite and partial-to-substantial regain of lost weight, because the appetite and gastric-emptying effects depend on continued receptor activation. Retatrutide is a triple GIP/GLP-1/glucagon agonist still in clinical trials, so any such observations describe investigational or approved medicines in human studies. Retatrutide is an unapproved research-grade peptide supplied for laboratory research only and is not for human use.
Where can I buy Retatrutide?
Right here — Retatrutide is supplied directly by New-U Research Compounds on this page. Every batch is independently third-party tested to >99% HPLC purity with a batch-linked Certificate of Analysis, supplied as lyophilised research-grade material, and shipped direct from source worldwide in discreet, tracked packaging. Strictly for laboratory research use only — not for human use.
How much does Retatrutide cost?
Retatrutide pricing is shown live on this page, per pack size — 10-vial research packs as standard, with single-vial sample options on selected compounds. Larger vial strengths lower the per-mg cost, every order includes the batch Certificate of Analysis, and shipping is free on orders over $300.
Is Retatrutide third-party tested?
Yes. Every Retatrutide batch is verified by independent laboratories (Janoshik Analytics and Freedom Diagnostics) for identity and purity, with a batch-linked Certificate of Analysis confirming >99% purity by HPLC. Every order ships with its COA, and current batch certificates are published on our COA page.
How do I buy Retatrutide?
Add the Retatrutide pack size you need to your cart and check out: enter your shipping details, then choose your payment method — cryptocurrency or card — on the next step. Every order ships with its batch Certificate of Analysis (COA). Retatrutide is supplied strictly for laboratory research use only, not for human or veterinary use.
What payment methods can I use to buy Retatrutide?
At checkout you can pay by cryptocurrency (BTC, ETH, SOL, LTC, USDC, USDT and more) or by card, each handled by a dedicated secure payment provider. You choose your method after confirming your order.
How fast is shipping, and do you ship worldwide?
Yes — we ship worldwide in discreet, unmarked, temperature-stable, tracked packaging. Delivery typically takes 6–14 business days, and shipping is free on orders over $300.
Is it legal to buy Retatrutide?
In the United States, Retatrutide is sold strictly for laboratory and research purposes only. It is not approved by the FDA for human consumption and is not sold for that purpose. Regulatory status varies by jurisdiction — buyers are responsible for compliance in their own region.
Pharmacokinetics
Research-Observed Effects
Published Research Context
In the published clinical literature, subcutaneous retatrutide was titrated gradually to limit gastrointestinal effects — the Phase 2 and Phase 3 (TRIUMPH) programmes stepped up from 1 mg or 2 mg once weekly through 4 and 8 mg toward 12 mg maintenance over roughly 20–24 weeks. These figures describe the escalation schedules reported in published trials of the investigational drug and are recorded here as research context only.
Stacking Compatibility
Compatible compounds
Avoid combinations
Side Effects (Observed in Literature)
Common
Rare
Dose-dependent
Evidence Tier
Overall: Tier 1: Human clinical
Retatrutide now has pivotal Phase 3 human efficacy data in addition to its Phase 2 obesity and MASLD trials, though it remains investigational and is not approved in any jurisdiction. The research-grade material supplied here is unapproved laboratory material.
Tier 1 · Human clinical
Source References & Further Reading
Last reviewed: 16 June 2026 · New-U Research Compounds
Key Characteristics
Specifications
About Retatrutide (LY3437943): Triple GLP-1/GIP/Glucagon Agonist Research Guide
Retatrutide (LY3437943) represents the third wave of incretin-based metabolic research. First-generation GLP-1 agonists such as semaglutide proved the concept. Second-generation dual agonists such as tirzepatide added GIP. Retatrutide goes one step further by adding glucagon-receptor activation — making it a triple "GGG" tri-agonist that uniquely drives hepatic energy expenditure on top of appetite suppression.
The published Phase 2 data (NEJM, 2023) reported 24.2% mean body-weight reduction at 48 weeks, with the curve not yet flattening at study end. The pivotal Phase 3 trial TRIUMPH-1 (2025) extended that to 28.3% at 80 weeks with the 12 mg dose, with 45.3% of participants achieving ≥30% reduction and up to 30.3% reported at 104 weeks in a higher-BMI extension. Complementary MASLD data (Nature Medicine, 2024) reported up to 82.4% liver-fat reduction, the largest hepatic effect of any incretin-class research compound to date.
New-U Research Compounds supplies Retatrutide as a lyophilised, research-grade powder at >99% HPLC purity, verified by independent third-party labs including Janoshik and Freedom Diagnostics. All material is strictly for in-vitro and preclinical research. Retatrutide is not an approved medicine anywhere in the world, and nothing on this page is medical advice.
Customer Reviews
Retatrutide lab report was clear
The main reason I went with New-U for Retatrutide was the lab report access. The COA was clear, batch details were simple to match and the vial arrived exactly as listed. Good for keeping records tidy.
— Amina B****** · 30 June 2026
Good Retatrutide UK delivery
Ordered Retatrutide from New-U Research Compounds and delivery to the UK was quicker than expected. Tracking updated properly and the vial was packed tight, no damage or loose bits in the parcel.
— Callum R*** · 30 June 2026
First New-U Retatrutide order
First time using New-U Research Compounds. I ordered Retatrutide 20mg and it came well packaged with the batch info easy to check. The checkout was simple and the site felt more organised than a few others I looked at.
— Jonas E****** · 30 June 2026
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