Buy Retatrutide in the UK
Retatrutide, a triple agonist at the GIP, GLP-1 and glucagon receptors, in five vial strengths plus pens. Research use only.
from £28.998 options
- In UK stock Sent from Britain
- Leaves the same day When ordered before 2pm
- Tracked shipping No charge over £75
- Certificate of analysis Available on request
Prices for Retatrutide start at £28.99 for the 5mg vial, and all of it is already in British stock at diluents.co.uk rather than sourced to order. There are 5 strengths to choose from (5mg, 10mg, 20mg, 30mg, 40mg), offered as vial and pen. Order on a weekday before 2pm and the parcel leaves that day, tracked, in a box that gives no clue to its contents.
Because the parcel never leaves the country, nothing has to clear customs, no import charge falls due and nothing is held at a border. Each batch tests at ≥99% by HPLC, and a certificate of analysis for the stock you receive is available on request.
Tracked delivery costs £4.95, or nothing above £75. The ordering steps, one by one.
Every Retatrutide size and format
8 to choose from
Retatrutide 40mg
Pen · £3.02/mg
Other products containing Retatrutide
Stacks and kits →
Dual Agonist Stack
Metabolic Stack
Pen Starter Kit
Retatrutide + Cagrilintide Blend
Retatrutide Starter Kit
Elsewhere on the Metabolic & GLP-1 shelf
Whole shelf →
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MOTS-c
SLU-PP-332
Semaglutide
AOD-9604
5-Amino-1MQ
What is Retatrutide?
Developed under the code LY3437943, retatrutide acts at three receptors: GIP, GLP-1 and glucagon. No marketing authorisation for it exists anywhere in the world.
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 | Available on request |
Which studies have looked at Retatrutide?
For Retatrutide, the published record runs to 2 human studies, a claim few other compounds in this catalogue share. Grouped by study model, here is what each paper examined:
Studies in people
- 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 studies
- Structural insights into the triple agonism at GLP-1R, GIPR and GCGR manifested by retatrutide, Structural biology
Every entry names what a study examined. No entry reports an effect in a person, and nowhere does the site give instructions on how to use anything.
Buying Retatrutide in the UK: where and how
How does ordering work?
Choose a strength, add it to the basket and go through checkout; no account is needed. An order confirmation comes through at once, and since the site never takes a card, the payment details arrive separately by email.
What difference does UK stock make?
Your Retatrutide is sent from a warehouse in Britain, so it skips customs, attracts no import charge and loses no days travelling from overseas. A courier collects it the same afternoon if the order is in before 2pm on a working day; the parcel then travels tracked in a plain outer box.
What do you receive?
| Purity | ≥99%, measured by HPLC |
|---|---|
| Labelling | Compound name, strength, format, purity and a research-use statement |
| Certificate of analysis | Available on request for the stock you receive |
| Delivery | UK addresses only, tracked. £4.95, or free over £75 |
| Returns | Within 14 days for sealed, unopened items, see the terms |
Retatrutide reconstitution
What ships is a dry, freeze-dried cake, and bacteriostatic water is what turns it into a solution. The volume you choose sets how strong that solution ends up. Water only spreads the contents out; it never adds to or takes from the milligrams sealed in the vial.
The figures above are volumes and concentrations of a solution; none of them is a dose, and no guidance on dosing, protocols or administration is given on this site.
The figures open on the 5mg vial with 2ml added, and they update as soon as either control changes. For the syringe-scale conversion, a comparison of the waters and the keeping time of a mixed vial, use the full reconstitution calculator.
| 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 |
As a worked case, the 5mg vial with 2ml of bacteriostatic water comes to 2.5 mg/ml, which is simply the label milligrams divided by the millilitres added. Every number in the table is the concentration of a solution, never a dose. Dosage, protocol and administration guidance appear nowhere on this site.
Asked about mixing Retatrutide
How to mix Retatrutide?
Once the vial is at room temperature and the stopper has been swabbed, the bacteriostatic water goes in along the glass wall, away from the powder. Keep rolling until the solution is clear, and do not shake. The volume chosen fixes the concentration; for 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?
Spread through the four usual volumes, 20mg works out like this: 1ml gives 20 mg/ml, 2ml gives 10 mg/ml, 3ml gives 6.67 mg/ml, 5ml gives 4 mg/ml. That strength is one we sell, with a row in the table above and an entry in the picker.
How much bac water for 5mg Retatrutide?
Spread through the four usual volumes, 5mg works out like this: 1ml gives 5 mg/ml, 2ml gives 2.5 mg/ml, 3ml gives 1.67 mg/ml, 5ml gives 1 mg/ml. That strength is one we sell, with a row in the table above and an entry in the picker.
What care does the vial need?
- A chilled vial should warm to room temperature first.
- Before every entry through the stopper, clean it with an alcohol swab.
- Let the water run down the inside wall of the glass; never squirt it onto the cake.
- Roll, never shake: foam means protein has been damaged, and rolling between the fingers avoids it.
- Expect a few minutes before it dissolves fully; a correctly mixed vial ends up clear.
Retatrutide storage
| Vial, still sealed | Keep it dark, dry and cool; the freezer suits long-term storage best. |
|---|---|
| After mixing | Refrigerate it upright and shaded. A mixed solution should never be frozen. |
| Pen | Already in solution, so refrigerate it the day it arrives. |
What is its shelf life?
| Condition | Typical life |
|---|---|
| Unopened, in a −20 °C freezer | Years. No other condition preserves a lyophilised peptide as well |
| Unopened, in a fridge at 2–8 °C | Months |
| Unopened, at room temperature | Weeks. It copes with the time in transit but should not be kept like this |
| Mixed, in the fridge | Weeks rather than months. With bacteriostatic water added, the usual working figure is four weeks, and making that possible is the job of its preservative |
| Mixed, then frozen | Not recommended. Peptides are torn by ice crystals, and each freeze–thaw cycle compounds the damage |
These are the standard figures for lyophilised peptides in general; no stability study on a single batch produced them. Time is gained by keeping it cold and dry, and lost to damp, warmth, light and rough handling. A certificate of analysis is available on request.
Is Retatrutide legal in the UK?
Here it is supplied strictly as an unlicensed compound for laboratory research use only. No UK marketing authorisation covers Retatrutide and it is not a licensed medicine, nor is it intended for human or veterinary use, or for food.
Compounds of this kind are not controlled drugs, and they can lawfully be sold as laboratory material; it is selling or marketing them for use by people that the law does not allow. That boundary is why this site carries no dose, protocol, route, frequency or medical claim, and why an emailed request for one is declined as well.
Some molecules in this range are also present in a licensed medicine marketed under a brand name. Its authorisation covers only the finished product for which it was granted, not the molecule in any other setting. Read the full terms.
Questions about Retatrutide
Does retatrutide have UK approval?
No, and it is not approved in any other country. With no marketing authorisation anywhere, it is supplied here as a research compound.
Which receptors does retatrutide target?
Three: GIP, GLP-1 and glucagon.
Which sizes are available?
Pens come at 20mg, 30mg and 40mg; vials at 5mg, 10mg, 20mg, 30mg and 40mg.
Where can I buy Retatrutide online?
In the UK, diluents.co.uk supplies Retatrutide in 5 strengths from 5mg up to 40mg, as vials and pens, priced from £28.99. Without an overseas leg, there is no late import VAT bill and no broker fee to have the box released. The per-milligram cost falls as the size rises, from £5.80/mg on the smallest vial to £1.82/mg at the best rate, and each size lists its own figure. Because it is supplied as freeze-dried powder, the concentration is whatever you choose when it is mixed. It is also a component of 5 other products in the range. Orders placed before 2pm on a weekday go out the same day, tracked and in plain packaging. Each batch goes through third-party lab testing and returns an HPLC result of ≥99%; the certificate covering yours is available on request, and for the steps, see how to order.
How much is Retatrutide?
Prices begin at £28.99 with the 5mg, £5.80 a milligram. Each of the 8 options carries a separate price and a separate per-milligram rate. Delivery costs £4.95, and above £75 there is no charge at all.
How to store Retatrutide?
Unopened and dry, it lasts for years in a freezer at −20 °C, for months refrigerated at 2–8 °C and for weeks at room temperature; the colder and drier the conditions, the longer it keeps. Once mixed with bacteriostatic water it belongs upright in the fridge, where four weeks is the usual working figure. A mixed vial must never be frozen, because ice crystals rip peptides apart and every freeze–thaw cycle repeats the damage.
Is Retatrutide FDA approved?
Our Retatrutide is supplied strictly for laboratory research, as an unlicensed research compound and for no other purpose. No UK marketing authorisation covers the product we sell, so it is not a licensed medicine; it is also not for human or veterinary use. Nor are we a pharmacy.
Can I see a certificate for your Retatrutide, and what purity is it?
Yes. HPLC puts it at ≥99%, and on request we send the certificate of analysis that matches the material in your order. To check where current stock stands before you place an order, just 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
Follow any link to read the original paper in full.