Any medication that can affect multiple hormones is going to be more effective. If Approved, Retatrutide May Be the Most Powerful Weight Loss Drug on the Market While researchers havent yet directed tested retatrutide against semaglutide or tirzepatide in clinical trials, the latter two medications have been compared in a head-to-head trial
However, its effect on the colon is more controversial with discrepant findings regarding its effect on colonic transit time (34, 35)
Table of Contents What Is Retatrutide and Its Current Development Status in the UK Risks of Sourcing Unregulated Peptides Online MHRA Guidance on Unlicensed Weight Loss Treatments Approved Alternatives Available Through NHS and Private Clinics How to Speak to a UK Doctor About Emerging Weight Loss Options Scientific References Frequently Asked Questions What Is Retatrutide and Its Current Development Status in the UK Retatrutide is an investigational triple incretin receptor agonist (GLP-1, GIP, and glucagon) developed by Eli Lilly that remains in Phase 3 trials and holds no MHRA marketing authorisation as of mid-2025
If you are deciding between semaglutide and tirzepatide, the right answer depends on your medical history, goals, and tolerance
however, it should be noted that this study had a relatively small number of participants ( n =338) [34]
Injection-site reactions are common (5-10%) but mild