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 short entry deadlines.
Experts warn these promotions pose serious health risks.
They misuse aggressive marketing tactics for unlicensed medicines.
Some sellers disguise drug sales as fitness coaching programmes.
Authorities say platforms ban illegal drug sales.
