Buy Retatrutide UK
A triple receptor agonist in five strengths, as vials and pens. Research use only.
from £28.998 options
- In stock Ships from the UK
- Same-day dispatch Order before 2pm
- Tracked delivery Free over £75
- Certificate of analysis On request
Retatrutide is on the shelf at diluent.co.uk, held in British stock rather than ordered in, priced from £28.99 for the 5mg vial. It comes in 5 strengths, 5mg, 10mg, 20mg, 30mg, 40mg, as vial and pen. A weekday order placed before 2pm goes out the same day, tracked, boxed with nothing on the outside about the contents.
Shipping from inside the country is what removes the customs step: no clearance, no import charge, nothing sitting at a border. Purity is ≥99% by HPLC on every batch, and the certificate for the lot you are sent is yours on request against the number on the label.
Delivery runs £4.95, free above £75, tracked start to finish. See how ordering works.
Choose your Retatrutide
8 options
Retatrutide 40mg
Pen · £3.02/mg
Retatrutide is also supplied in
All combinations →
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Metabolic Stack
Pen Starter Kit
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Retatrutide Starter Kit
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What is Retatrutide?
Three receptors, GIP, GLP-1 and glucagon, under the development code LY3437943. Nowhere in the world holds a marketing authorisation for it.
Specification
| Development code | LY3437943 |
|---|---|
| Receptors | GIP, GLP-1, glucagon |
| Purity | ≥99% by HPLC |
| Vial strengths | 5mg, 10mg, 20mg, 30mg, 40mg |
| Pen strengths | 20mg, 30mg, 40mg |
| Vial state | Lyophilised powder |
| Certificate | On request, against the batch number |
What has Retatrutide been studied for?
The record behind Retatrutide includes 2 human studies, which few compounds in this catalogue can say. Below is what each paper set out to examine, sorted by the model it ran in:
Human studies
- Triple–Hormone-Receptor Agonist Retatrutide for Obesity, A Phase 2 Trial, Human, phase 2 randomised double-blind placebo-controlled (PMID 37366315)
- Triple hormone receptor agonist retatrutide for metabolic dysfunction-associated steatotic liver disease: a randomized phase 2a trial, Human, phase 2a
Structural work
- Structural insights into the triple agonism at GLP-1R, GIPR and GCGR manifested by retatrutide, Structural biology
Each line describes what a paper looked at. None of it reports an effect in a person, and no part of this site tells anyone how to use anything.
Where and how to buy Retatrutide in the UK
How do you order?
Pick a strength from the table, put it in the basket and check out. There is no account to set up. The confirmation reaches you straight away and the payment details follow by email, because no card is taken on the site.
Why does UK stock matter?
The Retatrutide you order leaves a warehouse in Britain. That means no customs step, no import charge and no days lost in transit from abroad. Before 2pm on a working day and it is collected that afternoon, tracked, in an outer box that gives nothing away.
What arrives in the box?
| Purity | ≥99%, by HPLC |
|---|---|
| Labelling | Compound, strength, format, purity, research-use statement and a batch number |
| Certificate of analysis | On request, matched to your batch number |
| Delivery | Tracked, UK only. £4.95, free over £75 |
| Returns | 14 days on unopened, sealed items, terms |
Reconstituting Retatrutide
The vial arrives as a freeze-dried cake. It becomes a solution once bacteriostatic water goes in, and how much you add is what decides the strength of that solution. The quantity in the vial never changes, only the volume it is spread through.
What you see here are concentrations and volumes. Nothing on this site is dosage, protocol or administration guidance, and no number above is one either.
Loaded with 5mg and 2ml to start. Move either control and the numbers move with it. The full reconstitution calculator goes further, into syringe units, which water to pick and how long a mixed vial lasts.
| Vial | + 1ml | + 2ml | + 3ml | + 5ml |
|---|---|---|---|---|
| 5mg | 5 mg/ml | 2.5 mg/ml | 1.67 mg/ml | 1 mg/ml |
| 10mg | 10 mg/ml | 5 mg/ml | 3.33 mg/ml | 2 mg/ml |
| 20mg | 20 mg/ml | 10 mg/ml | 6.67 mg/ml | 4 mg/ml |
| 30mg | 30 mg/ml | 15 mg/ml | 10 mg/ml | 6 mg/ml |
| 40mg | 40 mg/ml | 20 mg/ml | 13.33 mg/ml | 8 mg/ml |
Take the 5mg vial: 2ml of bacteriostatic water puts it at 2.5 mg/ml. The sum is the milligrams on the label over the millilitres you put in. Every figure here is a concentration. None of them is a dose, and this site carries no dosage, protocol or administration guidance at all.
Asked about mixing Retatrutide
How to mix Retatrutide?
Let it warm to room temperature, wipe the stopper, then send the bacteriostatic water down the side of the glass instead of onto the powder. Roll it until it clears; never shake it. Concentration follows from the volume you picked, so on the 5mg vial, 1ml gives 5 mg/ml, 2ml gives 2.5 mg/ml, 3ml gives 1.67 mg/ml, 5ml gives 1 mg/ml.
How much bac water for 20mg Retatrutide?
Whatever volume goes in, the 20mg lands somewhere on this scale: 1ml gives 20 mg/ml, 2ml gives 10 mg/ml, 3ml gives 6.67 mg/ml, 5ml gives 4 mg/ml. We keep that size, so you will find it in the table above and as a choice in the picker.
How much bac water for 5mg Retatrutide?
Whatever volume goes in, the 5mg lands somewhere on this scale: 1ml gives 5 mg/ml, 2ml gives 2.5 mg/ml, 3ml gives 1.67 mg/ml, 5ml gives 1 mg/ml. We keep that size, so you will find it in the table above and as a choice in the picker.
How should it be handled?
- Let a refrigerated vial reach room temperature first.
- Wipe the stopper with an alcohol swab every time you go in.
- Aim the water at the glass wall so it runs down, not straight onto the cake.
- Roll it gently between your fingers. Shaking makes foam, and foam is damaged protein.
- Give it a few minutes to go into solution. Done properly it finishes clear.
Storing Retatrutide
| Sealed vial | Somewhere cool, dry and dark. For anything long term, the freezer. |
|---|---|
| Once reconstituted | Fridge, standing upright, away from light. Never freeze it once mixed. |
| Pen | Comes ready mixed, so it goes in the fridge immediately. |
How long does it keep?
| Stored as | Keeps for |
|---|---|
| Sealed, frozen at −20 °C | Years. Nothing holds a lyophilised peptide better than this |
| Sealed, refrigerated at 2–8 °C | Months |
| Sealed, at room temperature | Weeks. Fine while it is in the post, not a place to keep it |
| Reconstituted, refrigerated | Think weeks, not months. Four weeks is the number most people work to once bacteriostatic water is in, which is exactly what its preservative is there for |
| Reconstituted, frozen | Best avoided. Ice crystals tear at peptides, and every freeze–thaw round makes it worse |
Treat these as the usual numbers for lyophilised peptides, not a stability result measured on one batch. Cold and dry buys time; moisture, heat, light and being shaken about take it away. Ask and we will send the batch certificate of analysis.
Is Retatrutide legal in the UK?
We sell Retatrutide as an unlicensed research compound, for laboratory research use only. There is no UK marketing authorisation behind it, it is not a licensed medicine, and it is not for human use, veterinary use or food.
Nothing of this kind is a controlled drug, and selling it as laboratory material is lawful. Selling or marketing it for people to take is not. That line is the reason you will not find a dose, a protocol, a route, a frequency or a medical claim anywhere on this site, and the reason asking for one by email gets the same answer.
A few molecules in this range also appear inside a licensed medicine sold under a brand name. That authorisation belongs to the finished product it was granted for; it does not follow the molecule anywhere else. Full terms.
Retatrutide questions
Is retatrutide approved in the UK?
It is not, and nowhere else either. No marketing authorisation exists for it, and we supply it as a research compound.
What receptors does retatrutide act on?
GIP, GLP-1 and glucagon.
What sizes do you stock?
We stock Vials at 5mg, 10mg, 20mg, 30mg and 40mg, and pens at 20mg, 30mg and 40mg.
Where can I buy Retatrutide online?
Retatrutide is available in the UK from diluent.co.uk, from £28.99, 5 strengths, 5mg to 40mg, as vials and pens. No overseas leg means no import VAT arriving a week late and no broker charging to release the box. Buy bigger and the milligram gets cheaper: £1.82/mg at the keenest rate against £5.80/mg on the smallest vial, with every size carrying its own number. It turns up as freeze-dried powder, so the concentration is yours to set when you mix it. It also turns up inside 5 other products we sell. Get the order in before 2pm on a weekday and it leaves that day, tracked, plainly packaged. Batches go to a third-party lab and come back at ≥99% by HPLC, and the certificate for yours is there if you ask, see how to order.
How much is Retatrutide?
It starts at £28.99 for the 5mg, £5.80 per mg. 8 options in all, each with its own price and its own rate per milligram. Postage runs £4.95, and nothing at all above £75.
How to store Retatrutide?
Still sealed and dry it will sit for years at −20 °C, months in a fridge at 2–8 °C, weeks at room temperature. Cold and dry is what buys the time. After mixing it goes in the fridge standing up, and four weeks is the figure most work to with bacteriostatic water. Never freeze it once mixed: ice crystals tear peptides apart and each freeze–thaw round does it again.
Is Retatrutide FDA approved?
We sell Retatrutide as an unlicensed research compound for laboratory research, and for nothing else. No UK marketing authorisation stands behind it, it is not a licensed medicine, and it is not for human or veterinary use. We are not a pharmacy.
What purity is your Retatrutide, and can I see a certificate?
≥99%, measured by HPLC. Quote the batch number on your label and we will send the certificate of analysis for that lot. If you would rather see where current stock sits before you commit, ask and we will tell you.
References
- Triple–Hormone-Receptor Agonist Retatrutide for Obesity, A Phase 2 Trial. N Engl J Med, 2023;389(6):514-526. PMID 37366315
- Triple hormone receptor agonist retatrutide for metabolic dysfunction-associated steatotic liver disease: a randomized phase 2a trial
- Structural insights into the triple agonism at GLP-1R, GIPR and GCGR manifested by retatrutide
Each one links out so you can read the paper itself.