Ayahuasca: What It Is, Traditional Use, Mental Health Research, Safety and Legal Status Around the World

Ayahuasca has received enormous attention in modern psychedelic culture, but its history began long before Western psychiatry became interested in DMT. It belongs to diverse Amazonian Indigenous knowledge systems and later syncretic religious traditions, and it should not be reduced to a commercial “psychedelic drink.”

What is ayahuasca?

A common traditional preparation combines the Banisteriopsis caapi vine with leaves such as Psychotria viridis. Psychotria can provide N,N-dimethyltryptamine, or DMT. Banisteriopsis caapi contains beta-carboline alkaloids including harmine and related compounds that inhibit monoamine oxidase A. This pharmacological combination makes orally consumed DMT psychoactive and also contributes its own biological effects.

Traditional use is not one single ceremony

Ayahuasca traditions differ among Indigenous nations and regions in Brazil, Peru, Colombia, Ecuador and elsewhere in the Amazon. Some practices are connected to healing, diagnosis, spirituality, community relationships and ecological knowledge. Modern retreat culture should not be presented as identical to Indigenous medicine, and responsible discussion requires respect for cultural sovereignty and local knowledge holders.

What does mental-health research show?

The research is interesting but still early. A randomized placebo-controlled trial published in Psychological Medicine studied 29 people with treatment-resistant depression and reported greater reductions in depressive symptoms after a single ayahuasca session compared with placebo during the short follow-up period. However, the sample was small and this result cannot establish ayahuasca as a standard treatment.

A 2024 review of ayahuasca pharmacology, safety and therapeutic effects concluded that human studies suggest possible benefits for depression and other psychiatric conditions, but emphasized that controlled studies remain few, sample sizes are small and follow-up periods are generally short. That is a very different message from saying that ayahuasca is a proven cure.

Safety is not optional

Ayahuasca can produce intense changes in perception, emotion, autobiographical memory and sense of self. A 2024 systematic review documented adverse events and highlighted the importance of clinical context. Because harmala alkaloids inhibit monoamine oxidase, interactions with some medications can be medically significant. People should not stop or change prescribed medication on their own in order to participate in a ceremony; medication decisions belong with qualified healthcare professionals.

Brazil: regulated religious use

Brazil provides one of the clearest national legal frameworks connected to ayahuasca. CONAD Resolution 1/2010 established norms and procedures compatible with religious use. This does not mean that DMT or every commercial ayahuasca activity is freely legal. The legal recognition is tied to a defined religious and ethical framework.

Peru: cultural recognition of traditional knowledge

Peru declared the traditional knowledge and uses of ayahuasca practiced by Amazonian native communities Cultural Heritage of the Nation in 2008. Peru’s National Institute of Health continues to describe ayahuasca as part of ancestral medicine. Cultural recognition is important, but it should not be simplified into the statement that every form of possession, export, tourism or commercial sale is automatically legal.

United States, Canada and other countries

In many countries, DMT is a controlled substance. In the United States, limited religious protections have arisen through federal religious-freedom litigation and specific exemptions, but this does not create public recreational legality. Canada also regulates DMT under federal controlled-substance law, and lawful activity with controlled substances generally requires a regulatory authorization or exemption where applicable. A retreat advertisement is not proof of legal status.

The responsible conclusion

Ayahuasca is simultaneously a traditional medicine, a religious sacrament in some communities, a complex psychoactive preparation and a subject of modern research. Those identities overlap but are not interchangeable. Responsible mental-health discussion should include screening, medication review, cultural respect, informed consent, psychological support and integration rather than treating a powerful altered state as a shortcut to healing.

Sources checked

Brazil Ministry of Justice/CONAD Resolution 1/2010; Peru National Institute of Health and Ministry of Culture; Palhano-Fontes et al., Psychological Medicine, 2019; White et al., International Journal of Toxicology, 2024; dos Santos and colleagues’ recent reviews of ayahuasca pharmacology and safety. Educational information only; not medical or legal advice.