Sellers promote unlicensed weight-loss drugs through WhatsApp and Telegram competitions.
They offer injectable medicines as prizes to attract customers.
The Guardian found groups advertising retatrutide, an unapproved experimental drug.
Posts pressure users with 24-hour deadlines.
Experts warn these tactics are extremely dangerous.
They apply aggressive marketing to unlicensed pharmaceuticals.
One group offered retatrutide, Glow pens, and melanotan II as prizes.
None of these injections hold UK approval.
UK law restricts weight-loss drugs to prescription-only supply.
Unapproved medicines cannot be legally sold or advertised.
Another seller disguises drug sales as fitness coaching.
Researchers say this approach bypasses safeguards and increases health risks.
