Online sellers promote unlicensed weight-loss drugs through WhatsApp and Telegram giveaways.
They market powerful injectable medicines as prizes.
The Guardian found groups advertising retatrutide, an experimental drug without approval.
Posts pressure users with 24-hour entry deadlines.
Experts warn these tactics pose serious health risks.
They say marketers apply aggressive sales techniques to unlicensed medicines.
One group offered prizes including retatrutide, Glow pens, and melanotan II.
None of these injectable products hold UK approval.
UK law allows weight-loss injections only with prescriptions.
Unapproved drugs cannot be legally sold or advertised.
Researchers say giveaways trivialise medical risks and bypass safety controls.
