Ayahuasca rituals – Traditional Amazonian ayahuasca ceremonies, like this one in Colombia, use a hallucinogenic plant as part of a spiritual healing ritual.
Ayahuasca International – Since 2013, ayahuasca has had an open presence outside of the Amazon largely through the work of Ayahuasca International, a company offering retreats across the globe where the substance is consumed.
Controlled substance – Ayahuasca is made from two Amazonian plants: the Banisteriopsis caapi vine and the leaves of the chacruna plant. In some countries it's a controlled substance that's illegal to possess, sell or distribute.
Alberto Jose Varela – Ayahuasca International, whose founder Alberto Jose Varela is pictured here holding pieces of Banisteriopsis caapi vine, currently has 50 staff members operating in 10 countries.
Giant sleepover? – A recent session in a house in a small village in Spain gathered people looking for a life-changing experience. Mattresses are laid on the floor for participants.
Vomiting, tears, laughter – Buckets are provided. Throughout the five or six hours the ayahuasca session lasts, there's a cacophony of noises ranging from retching and vomiting, through to sobbing and hysterical laughter.
Ayahuasca epiphany – After experiencing ayahuasca, Ramon resigned from his job, moved to Spain and took part in a six-month course to become an Ayahuasca International facilitator.
Health-related goals – Fabienne, 51, hopes ayahuasca will ease the multiple sclerosis she was diagnosed with 12 years ago.