Hidden sellers promote unlicensed weight-loss drugs through WhatsApp and Telegram giveaways.
They offer injectable medicines as competition prizes.
The Guardian found groups advertising retatrutide, an unapproved experimental drug.
Posts pressure users with 24-hour deadlines.
Experts warn these promotions pose serious health risks.
They misuse digital marketing to sell unlicensed medicines.
UK law restricts weight-loss injections to prescription-only supply.
Unapproved drugs cannot be legally sold or advertised.
Some sellers disguise drug sales as fitness coaching programmes.
Administrators secretly use workout names to indicate drug dosages.
Telegram and Meta say they ban illegal drug sales.
