Exclusive: Guardian investigation finds unlicensed jabs offered as experts call for more online regulation

Companies selling illegal weight-loss drugs are amassing positive Trustpilot reviews as critics say regulatory gaps allow high-risk operators to appear credible.

A Guardian investigation found that Retatrutide UK had a score of 4.4 on the global review site, despite purporting to offer a drug that is unlicensed and illegal to sell or buy. Its website sells a 20mg retatrutide pen for £132.

It is among a number of operators promoting themselves on the review website to appear legitimate. Academics have said the findings are alarming, showing how easy it is for people to be drawn into unregulated markets.

One reviewer of Retatrutide UK on Trustpilot wrote: “So far so good. My pen arrived quickly and … First few pounds off and still feeling well with it. Would recommend.” The company did not respond to a request for a comment.