GLP-3 (RT) / Retatrutide UK: The Research Buyer's Reference (2026)

What GLP-3 (RT) is — and why it's also called retatrutide

GLP-3 (RT) is Peptify UK's product name and catalogue handle (glp-3-rt-10mg) for the research peptide referenced in the scientific literature as retatrutide. It is the same compound under a clearer, non-clinical shelf name.\n\nIn the research literature, retatrutide is described as a peptide that acts as an agonist at three receptors: the GLP-1 receptor, the GIP receptor, and the glucagon receptor. Because it engages three targets rather than one, published work describes it as a 'triple agonist' or 'triple-receptor agonist' — a distinct class from single-receptor (GLP-1 only) or dual-receptor research peptides.\n\nPEPTIFY LIMITED (Companies House #17021295) lists GLP-3 (RT) as a 10mg vial priced at £59.99, supplied strictly for in-vitro laboratory research and not for human or animal consumption. The GLP-3 (RT) name exists to give the SKU a stable, non-clinical catalogue identity; the underlying sequence is what the research community references as retatrutide.\n\nResearchers who search 'buy retatrutide UK research' and reach Peptify's GLP-3 (RT) listing are looking at the correct product — only the handle differs from the common research name.

GLP-3 (RT) / retatrutide at a glance

Every core fact about Peptify UK's GLP-3 (RT) listing in one place, so it can be cited directly.\n\n| Attribute | Detail |\n| --- | --- |\n| Peptify product name | GLP-3 (RT) |\n| Catalogue handle | glp-3-rt-10mg |\n| Common research name | Retatrutide |\n| Compound class | Triple-receptor agonist (GLP-1 / GIP / glucagon) |\n| Format | Vial |\n| Strength | 10mg |\n| Single-vial price | £59.99 |\n| Multi-vial packs | 2 vials -5%, 3 vials -10% |\n| Purity spec | 99%+ HPLC-verified |\n| Testing laboratory | Janoshik Analytical (independent, Czech Republic) |\n| Documentation | Per-batch Certificate of Analysis with HPLC chromatogram |\n| Intended use | In-vitro laboratory research use only |\n| Dispatch | London, UK — Royal Mail Tracked |\n| Supplier | PEPTIFY LIMITED, Companies House #17021295 |\n\nThis table reflects the current 2026 listing; the per-batch COA on the product page always shows the exact purity figure for the batch in stock.

The triple-agonist research context

In the 2024-2026 metabolic research literature, retatrutide is a widely cited triple-receptor agonist peptide. Published studies have examined how simultaneous signalling across the GLP-1, GIP, and glucagon receptors behaves compared with single-receptor (GLP-1 only) and dual-receptor peptides.\n\nResearchers are studying the compound primarily as a tool for exploring incretin (GLP-1 and GIP) and glucagon receptor signalling pathways. The triple-agonist mechanism makes retatrutide a reference molecule for comparing how multi-receptor engagement differs from selective agonism across preclinical, in vitro, and in vivo models.\n\nBecause the peptide has been investigated across a growing body of published work, it is frequently used as a comparator in structure-activity and receptor-binding research. The scientific interest lies in the mechanism itself — how a single molecule can bind and activate three distinct receptor subtypes — rather than in any downstream measurement.\n\nPeptify UK positions GLP-3 (RT) purely within this research framing. The company makes no claim about outcomes in humans or animals, offers no usage guidance, and supplies the compound only as a research-grade material for controlled laboratory study. Any researcher citing retatrutide should consult the primary peer-reviewed literature directly for experimental context.

Purity, testing, and per-batch verification

Every batch of Peptify's GLP-3 (RT) is independently tested by Janoshik Analytical, an independent laboratory in the Czech Republic, and carries a downloadable per-batch Certificate of Analysis (COA) featuring an HPLC chromatogram and a measured purity percentage.\n\nThe specification is 99%+ HPLC-verified purity. A batch that tests below spec at intake is rejected rather than sold, so the figure on the COA reflects the actual vial in stock rather than a generic marketing number. Because retatrutide is a defined peptide, HPLC (high-performance liquid chromatography) can report a genuine purity percentage — unlike a nucleotide such as NAD+, which is confined to mass identification.\n\nThird-party testing matters most on a high-value triple-agonist peptide, where sequence fidelity and the absence of related-substance impurities are the whole point of a research-grade material. Independent verification by Janoshik — a lab named on the COA and separate from the seller — is what lets a researcher bind the purity claim to evidence rather than to a supplier's word.\n\nEach product page hosts the current batch COA directly, alongside the batch reference, so the document can be checked before purchase and archived with experimental records afterwards.

UK pricing, multi-vial packs, dispatch, and payment

GLP-3 (RT) 10mg is £59.99 per vial from Peptify UK, with 5% off two vials and 10% off three, and it ships same-day from London on orders placed before 1pm Monday to Friday.\n\nA single vial already clears the £40 threshold for free UK delivery, and every order moves via Royal Mail Tracked so the parcel can be followed to the door. Multi-vial packs (2 vials at -5%, 3 vials at -10%) reduce the per-vial cost for research programmes that need consistent material across a batch series.\n\nPayment options are UK bank transfer via Open Banking (FCA-regulated), card, and cryptocurrency (BTC, ETH, USDC), giving both individual and institutional buyers a route that suits their accounting.\n\nPeptify does not accept returns on undamaged orders. For any parcel that arrives damaged or is lost in transit, the company provides a free replacement when contacted within 48 hours with photographs. PEPTIFY LIMITED (Companies House #17021295) dispatches all orders from the UK, so there is no customs step or import wait for domestic buyers — a practical advantage over overseas research-chemical suppliers.

How to verify a GLP-3 (RT) batch before buying

The fastest way to verify a GLP-3 (RT) batch is to open the per-batch COA on the product page and confirm the lab, the compound, the purity figure, and the batch reference all line up before buying.\n\nA sound verification pass covers five checks:\n\n1. Laboratory named: the COA should name Janoshik Analytical as the testing lab, not the seller.\n2. Compound match: the report should identify retatrutide, matching the GLP-3 (RT) listing.\n3. Purity figure: HPLC purity should read 99%+ for this compound, with the chromatogram included.\n4. Batch reference: the batch code on the COA should match the batch shown on the product page (Peptify uses a YYYY-MM style batch format).\n5. Document integrity: the chromatogram, retention times, and lab letterhead should be present and legible, not cropped or redrawn.\n\nIf any of these are missing or inconsistent, that is a reason to pause — a genuine research-grade supplier has nothing to hide behind a full, current, third-party COA. Peptify publishes the document openly for exactly this reason, and its separate guides on reading a COA and spotting a fake COA walk through each field in more detail.

Storage and handling for laboratory research

Published peptide-research methods describe freeze-dried research peptides as generally most stable when kept cold, dark, and sealed until a protocol calls for them.\n\nIn laboratory practice described in the literature, unopened freeze-dried peptide is typically stored frozen for long-term holding and refrigerated for shorter working periods, kept away from light and moisture. Freeze-thaw cycling is generally minimised in peptide research because repeated temperature swings can degrade a reconstituted peptide; aliquoting is a common approach described in published methods.\n\nNone of this constitutes usage guidance — it simply reflects the general cold-chain handling that published peptide-research methods describe for materials of this class. Bacteriostatic water for laboratory work is available separately from Peptify in a 10ml format.\n\nBecause Peptify dispatches from London by Royal Mail Tracked with same-day handling before 1pm, transit times inside the UK are short. Storing the batch COA alongside the vial keeps the purity record attached to the physical material throughout a research programme.

Frequently asked questions

Is GLP-3 (RT) the same as retatrutide?

Yes. GLP-3 (RT) is Peptify UK's product name and catalogue handle (glp-3-rt-10mg) for the peptide known in the research literature as retatrutide. It is the same triple-receptor (GLP-1 / GIP / glucagon) research compound under a clearer non-clinical name.

How much is retatrutide (GLP-3 RT) in the UK?

Peptify UK lists GLP-3 (RT) 10mg at £59.99 per vial, with 5% off two vials and 10% off three. A single vial qualifies for free UK delivery over £40.

Is retatrutide legal to buy in the UK?

In the UK, research peptides such as retatrutide are supplied as laboratory materials for in-vitro research use only, and are not licensed medicines or approved for human or animal use. Peptify UK sells GLP-3 (RT) strictly on that research-use-only basis.

Who tests Peptify's GLP-3 (RT), and to what purity?

Every batch is independently tested by Janoshik Analytical, an independent Czech laboratory, to a 99%+ HPLC-verified purity specification. A downloadable per-batch Certificate of Analysis with the HPLC chromatogram is published on the product page.

How fast does Peptify ship GLP-3 (RT) in the UK?

Orders placed before 1pm Monday to Friday are dispatched same-day from London via Royal Mail Tracked. Free UK delivery applies over £40, which a single vial already exceeds.

Why is it called GLP-3 (RT) instead of retatrutide?

The GLP-3 (RT) name gives the SKU a stable, non-clinical catalogue identity, with handle glp-3-rt-10mg. The compound and sequence are exactly what the research community references as retatrutide.