Retatrutide Price UK — Cost Per mg, Per Month & Vial vs Pen
Current retatrutide price in the UK: 20mg £89.00, 30mg £119.00 and 40mg £154.00 — that is £3.85–£4.45 per mg. Every vial is held in UK stock, independently HPLC tested with a batch-matched Certificate of Analysis, and dispatched the same working day when ordered before 2pm.
Vials are the cheapest way to buy retatrutide — a pre-filled pen adds £34.99 for the hardware and preparation. For In Vitro Use Only — Not for Human Use.
Retatrutide price list & cost per mg
| Vial | Vial price | Cost per mg | Pen price | You save with the vial |
|---|---|---|---|---|
| Retatrutide 20mg | £89.00 | £4.45/mg | £123.99 | £34.99 |
| Retatrutide 30mg | £119.00 | £3.97/mg | £153.99 | £34.99 |
| Retatrutide 40mg | £154.00 | £3.85/mg | £188.99 | £34.99 |
Buy at these prices on the retatrutide product page — or read the full retatrutide vials guide.
Retatrutide cost per month
Monthly cost depends on the weekly amount used. The table below assumes 4 weeks to the month and uses the vial price only.
| Weekly amount | 20mg (£89) | 30mg (£119) | 40mg (£154) |
|---|---|---|---|
| 1mg | £17.80/mo | £15.88/mo | £15.40/mo |
| 2mg | £35.60/mo | £31.76/mo | £30.80/mo |
| 4mg | £71.20/mo | £63.52/mo | £61.60/mo |
| 8mg | £142.40/mo | £127.04/mo | £123.20/mo |
At 2mg per week, a 40mg vial is the cheapest monthly option at roughly £30.80 a month and lasts around 20 weeks. Work out exact volumes with the free reconstitution calculator.
Why the vial is the cheapest way to buy retatrutide
- £34.99 cheaper per order than the same strength as a pre-filled Quick Pen.
- Lowest cost per mg — down to £3.85/mg on the 40mg vial.
- Same peptide, same batch, same COA — only the delivery format differs.
- Same-day dispatch before 2pm Monday to Friday, Royal Mail Tracked 24.
- You supply bacteriostatic water (from £6.99 for 10mL) and U-100 insulin syringes.
Prefer it ready to dose? The Retatrutide pen is the same vial reconstituted and calibrated for you.
How our retatrutide pricing compares
Cost per mg is the fair way to compare suppliers — a cheap headline price on a small vial is usually more expensive per mg once shipping is added. Our vials ship from UK stock, so there are no customs charges, no overseas reshippers and no seizure risk.
Compare across compounds on our tirzepatide vials, semaglutide vials and all peptide vials pages.
Browse related products
View full shopFrequently asked questions
How much does retatrutide cost in the UK?
Retatrutide costs £89.00 for a 20mg vial, £119.00 for 30mg and £154.00 for 40mg at Peptides UK 4U — that is £4.45, £3.97 and £3.85 per mg respectively. All strengths are held in UK stock with same-day dispatch before 2pm. For In Vitro Use Only — Not for Human Use.
What is the retatrutide cost per month?
At 2mg per week (8mg a month) a 20mg vial at £89 works out at roughly £35.60 per month, a 30mg vial at £119 roughly £31.76 per month and a 40mg vial at £154 roughly £30.80 per month. At 4mg per week those figures double. Larger vials always give the lowest monthly cost.
What is the cheapest way to buy retatrutide in the UK?
The 40mg vial at £154 is the cheapest per mg (£3.85/mg). Buying the vial rather than a pre-filled pen saves £34.99 per order, because you reconstitute it yourself with bacteriostatic water and dose with a U-100 insulin syringe.
How much is retatrutide per mg?
£4.45 per mg on the 20mg vial, £3.97 per mg on the 30mg vial and £3.85 per mg on the 40mg vial. Cost per mg falls as vial size rises because the vial, cold pack and tracked postage are fixed costs spread over more peptide.
Why is a retatrutide pen more expensive than a vial?
A pen is the same vial, same batch and same COA, plus a £34.99 dial-a-dose Quick Pen that we reconstitute, fill and calibrate in our UK facility with a clicks-per-mg card. You are paying for the preparation and hardware, not a different peptide.
Are there any hidden costs when buying retatrutide?
No. Prices include the vial, batch-matched Certificate of Analysis and discreet packaging. You will also need bacteriostatic water (from £6.99 for 10mL) and insulin syringes if you buy the vial format. Royal Mail Tracked 24 shipping is charged at checkout, and stock ships from the UK so there are no customs charges.
Does retatrutide get cheaper if I buy a bigger vial?
Yes. Going from the 20mg to the 40mg vial drops the cost from £4.45 to £3.85 per mg — around 13% cheaper per mg — and halves the number of orders and shipping charges over a study window.
Is retatrutide cheaper than tirzepatide or semaglutide in the UK?
Per mg, retatrutide sits close to our tirzepatide vials, but dosing differs between compounds so cost per week is the fairer comparison. Compare current pricing on our tirzepatide and semaglutide vial pages.
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.