Retatrutide Vials UK — 20mg, 30mg & 40mg Research Vials
Lyophilised retatrutide peptide vials, held in UK stock and dispatched the same working day when you order before 2pm. 20mg £89, 30mg £119 and 40mg £154 — each independently HPLC tested and confirmed by mass spectrometry with a batch-matched Certificate of Analysis.
Prefer it ready to dose? The same vials can be prepared as a pre-filled Reta pen — just switch the Format selector on the product page. For In Vitro Use Only — Not for Human Use.
Retatrutide vial prices & cost per mg
| Vial | Price | Cost per mg | Status |
|---|---|---|---|
| Retatrutide 20mg | £89.00 | £4.45 | In UK stock |
| Retatrutide 30mg | £119.00 | £3.97 | In UK stock |
| Retatrutide 40mg | £154.00 | £3.85 | In UK stock |
All strengths sit on one page — buy retatrutide vials here.
Reconstitution — mg/mL and syringe units
The simplest approach is 1mL of bacteriostatic water per 10mg of peptide, which gives a clean 10mg/mL solution on every strength. Add it slowly down the inside wall, swirl gently and never shake.
| Vial | Bac water | Concentration | 1mg | 2mg | 4mg |
|---|---|---|---|---|---|
| 20mg | 2mL | 10mg/mL | 10 units | 20 units | 40 units |
| 30mg | 3mL | 10mg/mL | 10 units | 20 units | 40 units |
| 40mg | 4mL | 10mg/mL | 10 units | 20 units | 40 units |
Working with a different fill volume? Use the free reconstitution calculator, or read the retatrutide dosage chart.
How long a retatrutide vial lasts
| Weekly amount | 20mg vial | 30mg vial | 40mg vial |
|---|---|---|---|
| 1mg | 20 weeks | 30 weeks | 40 weeks |
| 2mg | 10 weeks | 15 weeks | 20 weeks |
| 4mg | 5 weeks | 7.5 weeks | 10 weeks |
| 8mg | 2.5 weeks | ≈3.75 weeks | 5 weeks |
Once reconstituted, solution is generally treated as usable for around 4–6 weeks refrigerated, so larger vials are normally reconstituted in stages rather than all at once.
Vial vs pen — what actually changes
- Vial — lowest cost per mg, full flexibility, but you supply bacteriostatic water, syringes and sterile technique.
- Pen — we reconstitute and fill a dial-a-dose V2 Quick Pen in our UK facility and include a clicks-per-mg card; one all-in price, nothing to mix.
- The compound, batch and COA are identical — only the delivery format differs.
Full pen detail is in the Retatrutide pen UK guide, and the compound background is in the Retatrutide UK guide.
Purity, COAs and UK dispatch
- Independently HPLC tested and confirmed by mass spectrometry, every batch.
- Batch Certificates of Analysis published openly.
- Held in UK stock — same-day dispatch before 2pm, Royal Mail Tracked 24.
- Free needles and alcohol swabs included with every order.
- Discreet, plain outer packaging.
Other GLP research vials
We also stock Tirzepatide vials, Semaglutide vials and Cagrilintide vials. Compare them in our Retatrutide vs Tirzepatide and Retatrutide vs Semaglutide guides.
Browse related products
View full shopFrequently asked questions
Where can I buy retatrutide vials in the UK?
Peptides UK 4U holds lyophilised retatrutide peptide vials in UK stock — 20mg, 30mg and 40mg. Every batch is independently HPLC tested with a batch-matched Certificate of Analysis, and orders placed before 2pm on a working day are dispatched the same day by Royal Mail Tracked 24. For In Vitro Use Only — Not for Human Use.
How much is a retatrutide vial in the UK?
Our retatrutide 20mg vial is £89.00 (£4.45 per mg), the 30mg vial is £119.00 (£3.97 per mg) and the 40mg vial is £154.00 (£3.85 per mg). Larger vials give the lowest cost per mg.
How much bacteriostatic water do I add to a retatrutide vial?
A clean approach is 1mL of bacteriostatic water per 10mg of peptide — 2mL for a 20mg vial, 3mL for 30mg and 4mL for 40mg — giving a 10mg/mL solution every time. Add it slowly down the inside wall of the vial and swirl gently. Never shake.
How many units is 1mg of retatrutide from a vial?
At 10mg/mL, 1mg is 10 units on a U-100 insulin syringe. 2mg is 20 units, 4mg is 40 units and 8mg is 80 units. Our free reconstitution calculator handles any other fill volume.
How long does a retatrutide vial last?
A 20mg vial covers 10 weeks at 2mg per week, a 30mg vial 15 weeks and a 40mg vial 20 weeks. Once reconstituted, retatrutide is generally treated as stable for around 4–6 weeks refrigerated at 2–8°C, so larger vials are usually reconstituted in stages.
Retatrutide vial or pen — which should I choose?
The peptide, batch and COA are identical. A vial is the cheapest per mg and gives full dosing flexibility, but you supply bacteriostatic water, syringes and sterile technique. A pre-filled Quick Pen arrives ready to dose with a calibrated clicks-per-mg card. Choose either with the Format selector on the product page.
Do retatrutide vials come with a Certificate of Analysis?
Yes. Every batch is independently HPLC tested and confirmed by mass spectrometry, and the batch-matched COA is published openly on our COA page so you can verify the exact vial you received.
How should I store an unopened retatrutide vial?
Store lyophilised vials cool, dark and dry — below -18°C for long-term storage, or a 2–8°C fridge for shorter periods. Once reconstituted, keep refrigerated, out of light, never frozen and never shaken.
Is it legal to buy retatrutide vials in the UK?
Retatrutide may be purchased and possessed in the UK for laboratory research purposes only. It is not a licensed medicine and is not intended for human or animal use. For In Vitro Use Only — Not for Human Use.
Disclaimer: All products sold by Peptides UK 4U are for laboratory and research purposes only. They are not intended for human or animal consumption, diagnosis, treatment or prevention of any disease.