A man with a needle in his arm and vials of peptides in the background.
The Conversation

Where do peptides come from? We found out

Over the past year, staff working in Australia’s needle and syringe programs have noticed something unusual.

Thin-tipped needles, typically used for injecting heroin and methamphetamine in a vein, are being requested by a new kind of injector. They’re also taking a new kind of drug: peptides.

How did an experimental medicine still moving through clinical trials end up in needles made for injecting into a vein?

To answer that question, I followed the journey of a vial of retatrutide.

➡️ Read the full interactive story here