Hidden sellers promote unlicensed weight-loss drugs through WhatsApp and Telegram giveaways.
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 apply aggressive marketing tactics to unlicensed injectable medicines.
Giveaways offer drugs like retatrutide and melanotan II as prizes.
UK law allows weight-loss injections only with valid prescriptions.
Some sellers disguise drug sales as fitness coaching programmes.
This approach bypasses safeguards and trivialises medical risk.
Telegram and Meta say their rules ban illegal drug sales.
