Retatrutide, which has not yet completed clinical trials, is an experimental injection developed by the US drugmaker Eli Lilly that targets three gut hormones: GLP-1, GIP and glucagon. Early studies suggest it could help patients lose up to a quarter of their body weight, leading to it being hailed online as the next Ozempic. Ozempic is not licensed in the UK as a weight-loss drug. Buying Retatrutide illegally, however, carries serious risks.