Retatrutide Price in the UK

Last updated 13 June 2026

Quick answer

In the UK, research-grade retatrutide is priced by vial size (in mg) and purity. Smaller vials start lower, while larger vials cost more but are often better value per mg. The safest way to compare is price per mg, with a third-party COA for every batch.

What shapes the price

Vial size (mg): more mg means a higher price, but usually a lower price per mg.
Purity: high-purity, lab-tested stock costs more to make.
Testing: a third-party COA per batch adds cost but adds trust.
Dispatch: UK stock with fast dispatch can cost a little more than slow overseas post.

Compare by price per mg

The fairest way to compare two sellers is the price per mg. Here is the simple idea:

Example vial	Price	Price per mg
5 mg	£40	£8.00 / mg
10 mg	£60	£6.00 / mg
15 mg	£80	£5.33 / mg

Example figures only, to show the maths. Always check live prices and the COA.

Why very cheap can cost more

A price far below everyone else is a warning sign. It can mean low purity, no real testing, or the wrong amount in the vial. Eli Lilly warns that unapproved products can contain too much, too little, or the wrong ingredient. Paying a fair price for tested, batch-matched stock is the safer route.

Where price meets trust

The cheapest vial is not the best value if you cannot trust what is in it. Our where-to-buy guide lists the checks that matter, so you pay for quality, not just a low number.

Once you know how price per mg works, our homepage shows where to buy retatrutide UK with batch-matched testing.

Looking at suppliers?

Compare UK research suppliers

Common questions

How much does retatrutide cost in the UK?+

Research-grade retatrutide is priced by vial size in mg and by purity. Smaller vials start lower, while larger vials cost more overall but are often better value per mg. Always compare price per mg and check for a COA.

Why do prices vary so much?+

Price mostly tracks the amount in the vial (in mg) and the purity. A bigger vial costs more but is usually better value per mg. Very cheap prices can be a red flag for low purity or no testing.

What is a fair way to compare price?+

Compare price per mg, not just the sticker price. Also check that each batch comes with a third-party COA, which adds cost but adds trust.