Retatrutide (RETAKLIK) 40mg
Flexibility + value per mg
Synthetic triple receptor agonist for in vitro and in vivo laboratory research on GLP-1, GIP, and glucagon receptor pathways.
£165.00View COA and details
Verified & Lab-Tested
Buy Retatrutide UK —
Lab-Tested Research Peptides
Research-grade retatrutide, supplied in the UK with a batch-specific Certificate of Analysis on every pen. Verified ≥99% purity, UK dispatch, and none of the mystery. For laboratory research use only.
✓ Third-party COA per batch
✓ ≥99% verified purity
✓ UK dispatch
✓ Research use only
30 Trustpilot reviews700+ research orders fulfilledUK lab-tested dispatch
Where to buy retatrutide in the UK, done properly
If you're looking to buy retatrutide in the UK, the hard part isn't finding a seller — it's finding one who can prove what's in the pen. Retatrutide is Eli Lilly's investigational triple-agonist (LY3437943), still in clinical trials, with no MHRA authorisation. In the UK it can only be supplied as a research peptide for laboratory use — so the only thing that separates a credible supplier from a risky one is verification.
That's where we plant our flag. Every pen we sell ships with a batch-specific, third-party Certificate of Analysis confirming identity and ≥99% purity. No generic images, no "trust us" — the actual report for the actual batch.
What is retatrutide?
Retatrutide, Eli Lilly's investigational compound LY3437943, is a single peptide studied as a triple agonist across GLP-1, GIP, and glucagon receptors. That three-pathway design is why it appears so often in metabolic research.
The Phase 2 clinical trial was published in the New England Journal of Medicine and summarised by Eli Lilly. Those sources describe the investigational drug in trials, not the research-use compound sold here.
Supplied strictly for laboratory and in-vitro research use only. Not for human consumption. Not a medicine. No human-use outcomes are claimed.
Retatrutide for sale: current UK stock
Select from our independently verified Retatrutide research catalog.
RETAKLIK 2.0 (Retatrutide) 45mg
Convenience
Synthetic triple receptor agonist for in vitro and in vivo laboratory research on GLP-1, GIP, and glucagon receptor pathways.
£180.00View COA and details
RETAKLIK (Retatrutide) 60mg
Convenience + high concentration
Synthetic triple receptor agonist for in vitro and in vivo laboratory research on GLP-1, GIP, and glucagon receptor pathways.
£210.00View COA and details
Retatrutide UK price: what you're paying for
We price in the fair, lab-tested band — not the £15-mystery-pen range, and not the inflated "pharmacy-style" range either. What the price covers:
Independent testing
A third-party COA per batch. You can verify exactly what you are purchasing (see how we test).
Verified purity
≥99% purity guaranteed, confirmed directly on the analytical certificate, not just printed on the label.
Correct handling
Properly lyophilised under laboratory conditions and cold-chain dispatched to preserve peptide integrity.
UK accountability
Real client support, transparent returns policies, and rapid tracked UK shipping.
Why verification is the whole game
In a category with no regulator standing behind the product, the COA is the quality control.It's the single document that tells you whether you're buying retatrutide or an expensive question mark. We publish ours. If a supplier won't show you a batch-specific certificate, that tells you everything you need to know.
The science behind the compound is real and well documented — the Phase 2 trial data was published in the New England Journal of Medicine — but research-supplied peptides are not the regulator-verified clinical-trial formulation, which is exactly why testing each batch matters.
Research applications
- In-vitro pathway and receptor-binding studies across GLP-1, GIP, and glucagon receptors
- Structure-activity relationship investigation
- Metabolic and molecular research models
- Triple-agonist and dual-agonist comparison research
Specifications
- Purity
- >=99% HPLC verified
- Form
- Research peptide format
- COA
- Batch-specific third-party testing
- Dispatch
- Tracked UK dispatch
- Storage
- Keep dry, cold, and protected from light
- Classification
- Research use only
How to order
- 1
Select Product
Choose your pen from our stock list above.
- 2
Verify Quality
Check the COA linked directly on the product detail page.
- 3
Secure Checkout
Place your order with secure processing and tracked UK dispatch.
- 4
Reconstitution
Need reconstitution maths? Use our free retatrutide reconstitution calculator.
Frequently Asked Questions
Can you buy retatrutide in the UK?
Yes - as a research peptide for laboratory use only. It has no MHRA authorisation, so it cannot legally be sold or used as a medicine. Buy only from a supplier that publishes a batch-specific COA.
What is retatrutide?
Retatrutide is Eli Lilly's LY3437943, a triple-agonist research compound that activates GLP-1, GIP, and glucagon receptors. It remains investigational.
How does retatrutide work?
It activates three receptor pathways at once: GLP-1, GIP, and glucagon. Published trial findings are scientific background only; the compound sold here is for laboratory research use only.
What purity is your retatrutide?
My Reta retatrutide batches are independently HPLC-tested to >=99% purity, with batch-specific COA information surfaced on the product page.
How is it different from tirzepatide or semaglutide?
Tirzepatide is a dual GLP-1/GIP agonist and semaglutide is a GLP-1 agonist. Retatrutide adds glucagon receptor activity, making it a triple agonist.
Is retatrutide approved for human or weight-loss use in the UK?
No. Retatrutide is investigational, has no MHRA authorisation, and is supplied here strictly for laboratory research - not for human consumption.
How much does retatrutide cost in the UK?
Current pricing is shown above by strength. Credible lab-tested products cost more than COA-less mystery listings because independent testing, batch verification, and UK dispatch are built in.
How do I verify your COA?
Use the COA and quality-testing links on the page and product detail pages. The important checks are the batch number, test date, named lab, and independent verification route.
What form does retatrutide come in, and how should it be stored?
Products are supplied as research peptide formats shown above. Keep dry, cold, and protected from light; follow the product-specific storage guidance on the product page.
How do I reconstitute retatrutide?
Use bacteriostatic water and the retatrutide calculator for concentration maths. This site does not provide human dosing advice.
Is Retaklik the same as retatrutide?
Retaklik is a branded research-pen format of retatrutide. Retaklik 2.0 is a combination format that includes retatrutide and cagrilintide.
Do you ship retatrutide across the UK?
Yes - My Reta ships within the United Kingdom with tracked UK dispatch.
What is the difference between a vial and a Retaklik pen?
A vial is a lyophilised research peptide format that is reconstituted before use. A Retaklik pen is a branded convenience format; check the product page for the exact compound and strength.
Why buy from My Reta?
My Reta focuses on independently tested research products, batch COA visibility, UK dispatch, research-use compliance, and clear scientific background without human-use claims.
Retatrutide, verified — not assumed.
Lab-tested, COA-backed, UK-dispatched. The research-grade way to buy retatrutide in the UK.
For laboratory and research use only. Not for human consumption. Retatrutide has no MHRA marketing authorisation.