Tirzepatide is one of the most popular research peptides in the UK, and it is sold in more vial sizes than almost any other. That variety makes it hard to know whether you are getting a fair price. This guide explains how tirzepatide is priced across different vial sizes and how to compare UK suppliers properly.
What is tirzepatide?
Tirzepatide is a peptide that acts on two hormone receptors, GIP and GLP-1, which is why it is often described as a dual agonist. Research-grade tirzepatide is sold in the UK as a freeze-dried powder for laboratory research only, and is separate from any licensed medicine.
Why bigger vials usually cost less per mg
Most of the cost of a vial is in manufacturing, filling and testing, not just the peptide itself. As a result, larger vials nearly always work out cheaper per milligram. UK listings currently range from 5mg to 60mg vials, and the price per mg on a 60mg vial can be well under half that of a small 5mg vial from the same seller.
- 5mg and 10mg vials: highest price per mg, useful for small or one-off projects.
- 20mg and 30mg vials: the most common sizes and often the best balance.
- 40mg to 60mg vials: usually the lowest price per mg for larger research programmes.
At the time of writing, the best-value UK tirzepatide listings work out at well under £2 per mg on large vials. Current prices for every size are listed on PeptideCheck’s tirzepatide price comparison.
What to check besides price
- An independent certificate of analysis showing HPLC purity and mass spectrometry identity.
- A batch number that matches the vial you receive.
- UK stock and a UK company you can contact.
- Clear research-use-only labelling.
Some suppliers publish a test result for one vial size and reuse it for all the others. Where possible, look for a certificate that covers the exact product you are buying.
Discount codes and delivery
Codes and free-delivery thresholds can change which supplier is cheapest, especially on smaller orders. Comparing the final delivered price, with any code applied, is the only fair way to rank sellers. PeptideCheck shows delivered prices and current codes side by side for UK suppliers.
The bottom line
Choose the vial size that suits the research, compare on delivered price per mg, and make sure the supplier can show independent test results. That combination gives the clearest picture of real value.
Note: the peptides discussed here are sold in the UK for laboratory research use only. They are not licensed medicines, and this article does not give medical advice or make therapeutic claims.
