Sellers promote unlicensed weight-loss drugs through WhatsApp and Telegram giveaways.
They offer injectable medicines as prizes.
The Guardian found groups advertising retatrutide, an unapproved experimental drug.
Posts pressure users to enter within 24 hours.
Experts warn these promotions pose serious health risks.
They misuse marketing tactics meant for consumer products.
One group offered retatrutide, Glow pens, and melanotan II.
None of these injectables have UK approval.
UK law allows weight-loss injections only with prescriptions.
Unapproved drugs cannot be legally sold or advertised.
Another seller hides drug sales behind fitness coaching codes.
Platforms say they ban illegal drug sales.
