Hidden sellers promote unlicensed weight-loss injections through WhatsApp and Telegram giveaways.
They offer drugs like retatrutide, which lacks approval anywhere in the world.
Posts pressure users with countdowns and free-entry claims.
Experts warn these tactics create serious health risks.
UK law restricts weight-loss injections to prescription-only supply.
Unapproved drugs cannot be legally sold or advertised.
Some sellers disguise drug sales as fitness coaching programmes.
Platforms say they ban illegal drug sales.
