The UK commercial hub for research-grade Tirz (LY3298176). Buy Tirz research peptide in the UK with batch-specific COA, ≥99% HPLC purity and temperature-controlled UK dispatch.
Tirz is the international non-proprietary name (INN) for the peptide originally developed by Eli Lilly under the code LY3298176. Under its licensed pharmaceutical brands it is sold as Mounjaro (type-2 diabetes) and Zepbound (weight management). Those are prescription medicines regulated by national medicines authorities.
BuyRetaUK does not supply Mounjaro or Zepbound. We supply research-grade Tirz as a laboratory chemical for in-vitro use only. Nothing on this site is medical advice, a prescription, or an offer to sell a medicinal product.
Every vial ships with a batch-specific COA · UK dispatch
Every batch is independently released against a ≥99% HPLC-UV specification with mass-spec identity.
Cross-reference the batch number printed on your vial against the COA in the verification library.
Picked, packed and shipped under cold-chain protocols from our UK facility.
Supplied strictly for laboratory research. Not a medicine — not Mounjaro or Zepbound.
Volumes for any concentration are handled by our reconstitution calculator.
Every claim cites primary literature — see the References section below.
| Research scenario | Recommended | Rationale |
|---|---|---|
| Dual GLP-1 / GIP receptor research | Tirz | The reference dual-incretin agonist — the primary tool compound for GIP + GLP-1 co-activation studies. |
| Triple-receptor incretin studies (GLP-1 / GIP / Glucagon) | RT3 | Adds glucagon receptor activation on top of dual GLP-1/GIP — the next step up from Tirz. |
| Single GLP-1 receptor baseline | Sema | Long-acting single-receptor GLP-1 comparator — the standard baseline. |
| Reconstitution / dilution | Bacteriostatic Water | Standard diluent for reconstituting lyophilised peptides. |
BuyRetaUK is a UK-based research-peptide supplier. Every Tirz batch is treated as a reference specimen: independent HPLC-UV purity confirmation, mass-spec identity, endotoxin data where determined, and a batch-specific Certificate of Analysis published in our public verification library.
Orders are picked, packed and dispatched from UK-based temperature-controlled storage under cold-chain protocols with tracked delivery. See our shipping policy for current cut-off times and packaging detail.
All BuyRetaUK products are supplied strictly for in-vitro laboratory research. We do not offer, market or discuss human or veterinary administration.
Reverse-phase HPLC quantifies purity as a percentage of total peak area. Release specification: ≥99%.
Learn more →Certificate of AnalysisEvery batch ships with a batch-specific COA reporting identity, purity and appearance.
Learn more →Laboratory QualityIndependent third-party analysis, temperature-controlled UK storage and full batch traceability.
Learn more →Batch VerificationCross-reference the batch number printed on your vial against our live COA library.
Learn more →Storage StandardsLyophilised at 2–8°C protected from light. Reconstituted stability ~30 days at 2–8°C.
Learn more →Tirz is frequently referenced alongside RT3 (triple GLP-1 / GIP / glucagon) and Sema (single GLP-1) as the triple / dual / single incretin reference set. See RT3 vs Tirz for the canonical side-by-side. Most laboratories also stock bacteriostatic water for reconstitution — dose volumes are handled by our reconstitution calculator.
No. Mounjaro and Zepbound are Eli Lilly's branded prescription medicines that contain Tirz. BuyRetaUK supplies research-grade Tirz (LY3298176) as a laboratory research material only. We do not sell, market or offer branded medicines.
Yes — BuyRetaUK supplies Tirz as a research chemical for in-vitro laboratory use only. It is not offered for human or veterinary administration.
≥99% by HPLC-UV, with identity confirmed by mass spectrometry. Each batch ships with a batch-specific Certificate of Analysis published in our verification library.
Dispatched from temperature-controlled UK storage under cold-chain protocols with tracked delivery. See our shipping policy for current cut-off times and packaging.
Tirz is a dual agonist (GLP-1 / GIP). RT3 is a triple agonist (GLP-1 / GIP / glucagon). Both are supplied as lyophilised research peptides at ≥99% HPLC. See our RT3 vs Tirz comparison guide.
Peer-reviewed citations are added as each article is expanded. See our editorial standards for our sourcing and accuracy commitments.
The BuyRetaUK editorial team publishes laboratory-focused reference content on research peptides, analytical methods and Certificates of Analysis. All articles are written for in-vitro research contexts only.
View profile →Every editorial article is reviewed against our accuracy commitment and quality-assurance checklist before publication. Named reviewer profiles are added as our reviewer network expands.
View profile →Every article follows a documented editorial process — sourcing, scientific review, update cadence and correction policy — so researchers can rely on what we publish.
Read the full editorial standards →Educational first. Each step is optional — start wherever you are in your research.
Dual GIP/GLP-1 receptor overview and research framing.
How dual receptor engagement drives the incretin response.
Published evidence base, SURPASS & SURMOUNT programmes, laboratory applications.
Phase 3 SURPASS & SURMOUNT read-outs and the peer-reviewed literature.
Dual vs triple incretin agonist — how they differ.
HPLC purity and Certificate of Analysis verification.
Lyophilised storage, bacteriostatic water reconstitution, in-use stability.
Every Tirz vial strength available.
UK commercial hub — lab data, COAs and dispatch.
Side-by-side comparison of RT3 and Tirz across receptor profile, research context and analytical considerations.
5 min read →Purity & Laboratory TestingThe quality standards BuyRetaUK applies to every batch — sourcing, analytical testing, storage and traceability.
5 min read →Storage & HandlingHow to store lyophilised research peptides and reconstitute them correctly for laboratory use.
4 min read →Product ComparisonsHow RT3 and Sema differ in receptor activity, compound class and laboratory research framing.
5 min read →Triple vs dual incretin agonist — receptor profile and research framing.
View comparison →Side by sideSelective GLP-1 agonist vs dual GIP/GLP-1 agonist — receptor pharmacology and evidence comparison.
View comparison →Multi-compoundAll GLP-1 / GIP / glucagon research compounds in one place.
View comparison →Every batch of Tirz ships with a third-party HPLC and mass-spec Certificate of Analysis. Browse the live COA library to verify your lot.
Triple vs dual incretin receptor profile — the canonical side-by-side.
View comparison →CatalogueTirz catalogueEvery stocked vial with live pricing and add-to-cart.
Browse catalogue →VerificationCertificate libraryCross-reference your batch number against the public COA library.
Open library →