The scientists and shamans of psychedelic retreats

There's a landmark project underway in Melbourne to find out whether psilocybin - the hallucinogenic compound in magic mushrooms - can be used to improve end-of-life experiences.

But many Australians have already turned to the underground because they're convinced psychedelics improve their mental health.

Geoff Thompson investigates whether it's worth all the risks.

This is a repeat of a program that aired in February 2021.