Sellers promote unlicensed weight-loss drugs through giveaways on WhatsApp and Telegram.
They offer injectable medicines like retatrutide as competition prizes.
Retatrutide remains experimental and lacks approval anywhere in the world.
Experts warn these promotions create serious health risks.
Groups use countdowns and raffles to pressure users into fast decisions.
Some prizes include other unapproved injectable substances.
UK law allows weight-loss injections only with valid prescriptions.
Unlicensed drugs cannot be legally sold or advertised.
Some sellers disguise drug sales as fitness coaching programmes.
Researchers say these tactics bypass safeguards and endanger public health.
