Unapproved weight-loss drug retatrutide draws buyers on gray market

Retatrutide, an experimental drug by Eli Lilly, is being purchased online from unregulated sellers despite lacking FDA approval. Users like Henry seek it after experiencing side effects from approved drugs. Doctors warn that self-prescribing without medical oversight poses serious health risks.

Retatrutide differs from existing weight-loss medications by activating three hormone pathways simultaneously—GLP-1, GIP, and glucagon—which accelerates metabolism and fat breakdown. In Eli Lilly's 80-week trial involving patients with severe obesity and heart conditions, the highest weekly doses produced an average 22% reduction in body weight, roughly 55 pounds.

Despite its promise, the drug remains unapproved by the FDA, yet demand is substantial. A dedicated Reddit community receives over 179,000 weekly visits, and physicians report fielding daily patient inquiries. Regulators in the UK seized counterfeit retatrutide in October 2025, underscoring the dangers of unregulated sourcing from overseas sellers.