The psychoactive substance ayahuasca is common in Brazil. For generations, indigenous people have incorporated it into their rituals. Researchers say it can serve as an alternative to anti-depressants - and as a way to treat drug addiction.

The psychoactive substance ayahuasca is common in Brazil. For generations, indigenous people have incorporated it into their rituals. Researchers say it can serve as an alternative to anti-depressants - and as a way to treat drug addiction.

The psychoactive substance ayahuasca is common in Brazil. For generations, indigenous people have incorporated it into their rituals. Researchers say it can serve as an alternative to anti-depressants - and as a way to treat drug addiction.

The psychoactive substance ayahuasca is common in Brazil. For generations, indigenous people have incorporated it into their rituals. Researchers say it can serve as an alternative to anti-depressants - and as a way to treat drug addiction.

The psychoactive substance ayahuasca is common in Brazil. For generations, indigenous people have incorporated it into their rituals. Researchers say it can serve as an alternative to anti-depressants - and as a way to treat drug addiction.

The psychoactive substance ayahuasca is common in Brazil. For generations, indigenous people have incorporated it into their rituals. Researchers say it can serve as an alternative to anti-depressants - and as a way to treat drug addiction.

The psychoactive substance ayahuasca is common in Brazil. For generations, indigenous people have incorporated it into their rituals. Researchers say it can serve as an alternative to anti-depressants - and as a way to treat drug addiction.

The psychoactive substance ayahuasca is common in Brazil. For generations, indigenous people have incorporated it into their rituals. Researchers say it can serve as an alternative to anti-depressants - and as a way to treat drug addiction.