Ayahuasca in Peru — Traditions, Research and Safety

What Ayahuasca Is and Why It Affects Consciousness

Ayahuasca is a name used for traditional Amazonian preparations associated with the vine Banisteriopsis caapi. A common psychoactive brew combines the vine with a DMT-containing plant, frequently Psychotria viridis, known in Peru as chacruna.

The composition of traditional preparations is not uniform. Different communities have their own histories, plant knowledge and ceremonial practices. Not everything described commercially as ayahuasca has the same composition or cultural context.

The Role of DMT and Beta-Carboline Alkaloids

DMT, or N,N-dimethyltryptamine, is a psychoactive compound associated with changes in perception and cognition.

The Banisteriopsis caapi vine contains beta-carboline alkaloids, including harmine, harmaline and tetrahydroharmine. Harmine and harmaline have reversible inhibitory effects on the enzyme monoamine oxidase A (MAO-A).

This interaction is important to the pharmacology of traditional DMT-containing ayahuasca preparations. It also creates potential drug-interaction risks, especially when serotonergic medications or other interacting substances are involved.

What People May Experience

Descriptions include altered visual perception, vivid imagery, changes in emotional intensity, unusual autobiographical associations and a different sense of time or personal identity.

Not every experience is pleasant or insightful. Fear, disorientation, distressing memories and confusion can occur. Physical effects may include nausea, vomiting, diarrhoea, dizziness and changes in heart rate or blood pressure.

The intensity and character of an experience depend on multiple factors. Chemical composition, individual health, other substances, expectations and the surrounding environment can all matter.

Memory, Emotion and Subjective Experience

Some researchers examine whether psychedelic experiences change how memories are recalled or emotionally interpreted. This is different from demonstrating that ayahuasca reliably improves memory.

Claims of enhanced memory, permanent cognitive improvement or the recovery of perfectly accurate forgotten memories should be treated with particular caution.

Ayahuasca in Indigenous Amazonian Traditions

Long before ayahuasca attracted international interest, Amazonian peoples had developed distinct bodies of knowledge concerning plants, healing, social life and spiritual relationships with the natural world.

There is no single, uniform ayahuasca tradition. Practices differ among Indigenous communities, regions and lineages. The vocabulary, social purpose and interpretation of experiences can also differ.

Traditional Healers and Plant Knowledge

In different Amazonian traditions, experienced practitioners may occupy roles involving plant knowledge, healing practices, ceremonial leadership and the transmission of cultural teachings.

Terms such as curandero or shaman are often used by outsiders as general labels. They do not capture every cultural distinction or establish that an individual practitioner has equivalent training.

Traditional songs, including those called ícaros in some Peruvian Amazonian contexts, may form part of ceremonial practice. Their meaning belongs to the relevant cultural setting.

The Shipibo-Konibo and Other Amazonian Peoples

The Shipibo-Konibo, whose cultural territory is associated with the Ucayali region, are among the Amazonian peoples known internationally for traditions involving plant knowledge, ceremonial practice and distinctive artistic expression.

Their cultural identity should not be reduced to ayahuasca tourism. Language, social organisation, art and relationships with the landscape are equally important.

The growth of international interest creates opportunities for cultural exchange, but also risks commercial appropriation, misleading representation and unequal financial relationships.

Peru's Recognition of Traditional Ayahuasca Knowledge

On 24 June 2008, Peru issued National Directorial Resolution 836/INC, recognising the traditional knowledge and uses of ayahuasca practised by Amazonian Indigenous communities as part of the nation's cultural heritage.

The recognition concerns traditional knowledge and cultural continuity. It should not be interpreted as a blanket commercial licence for every retreat centre, facilitator or tourism company in Peru.

The Peruvian Ministry of Culture heritage register records this official declaration.

The Structure and Meaning of an Ayahuasca Ceremony

Ceremonies are not identical across Amazonian cultures. They may differ in leadership, setting, ritual practices, numbers of participants and the way experiences are understood.

Some traditions include songs, periods of silence, particular forms of preparation and relationships between the practitioner and participants.

International retreats may borrow elements from these traditions, but a modern commercial programme should not automatically be described as an authentic representation of a specific Indigenous community's practice.

Spiritual Interpretation and Personal Meaning

Within traditional settings, ayahuasca experiences may be understood through spiritual, social or healing frameworks. These interpretations deserve respectful representation.

Modern participants sometimes describe personal insights, emotional release or shifts in their understanding of their lives.

Such experiences can be meaningful without establishing a medical cure or proving a particular metaphysical explanation.

A powerful experience may also be difficult to interpret. Strong emotions or vivid imagery are not necessarily evidence that every perceived memory or conclusion is factually accurate.

The Role of the Ceremony Leader

Experience within a cultural tradition and competence in medical risk management are different qualifications. One does not automatically establish the other.

A prospective participant should therefore distinguish traditional experience from the operator's ability to assess medical contraindications, respond to emergencies and maintain appropriate safeguarding procedures.

These questions become particularly important when ceremonies take place far from hospitals or reliable transport.

What Scientific Research Has Found About Ayahuasca

Scientific interest in ayahuasca has expanded across pharmacology, neuroscience, psychology and psychiatry.

Research asks several different questions. How do its compounds affect the brain? What kinds of subjective experiences occur? Can carefully controlled administration produce measurable therapeutic effects? What are the associated risks?

The answers are not equally established. Human studies include small clinical trials, observational research and participant surveys. Their results need to be interpreted according to their study designs.

Depression and the 2018 Clinical Trial

One frequently cited study was a randomised, placebo-controlled trial involving 29 patients with treatment-resistant depression.

Researchers reported greater improvement in depression scores in the ayahuasca group compared with placebo during the seven-day follow-up. The findings were encouraging and helped stimulate further research.

The limitations are important: the trial was small, involved carefully selected patients, took place in a controlled clinical setting and had a short follow-up.

It does not demonstrate that commercial ceremonies can safely or reliably treat depression.

The original publication is available through Psychological Medicine (2018/2019) .

Anxiety, Trauma and Substance Use

Research has also explored associations between ayahuasca use and changes in anxiety, trauma-related symptoms, substance use and general wellbeing.

Much of the available evidence comes from observational studies, self-selected participants or settings where expectations and social support may influence reported outcomes.

These observations can justify further scientific investigation. They do not establish ayahuasca as a proven treatment for PTSD, addiction or other psychiatric conditions.

Why Set and Setting Matter

The terms set and setting refer broadly to a person's psychological condition and the environment in which an experience takes place.

A 2021 placebo-controlled study involving 30 experienced retreat participants observed improvements in depression, anxiety and stress measures in both the ayahuasca and placebo groups.

That result does not mean the active compounds have no effects. It demonstrates why expectations, group context and other non-pharmacological influences must be considered.

The study appeared in Psychopharmacology (2021) .

Ayahuasca, the Brain and Unanswered Questions

Modern neuroscience examines how ayahuasca-related compounds affect serotonin receptors, brain activity, emotional processing and the perception of self.

These investigations are scientifically interesting, but a measurable neurobiological effect is not automatically a clinical benefit.

Serotonin Receptors and Altered Perception

DMT interacts with several receptor systems, including serotonin receptors involved in perception and cognition.

Researchers have investigated changes in functional brain activity during psychedelic states, including alterations associated with self-referential processing.

These observations may help explain aspects of the subjective experience. They do not, by themselves, demonstrate permanent improvement in mental health.

Neuroplasticity and Neurogenesis

Laboratory and preclinical studies have investigated whether DMT or certain beta-carbolines influence cellular processes associated with plasticity and neuronal development.

Results obtained in cell cultures or animal models cannot be directly translated into claims that drinking ayahuasca causes the human brain to grow new neurons.

The same caution applies to claims about neuroprotection, memory enhancement and permanent changes in personality.

A 2024 review of ayahuasca's pharmacology, safety and therapeutic effects emphasises that controlled human studies remain relatively few, small and often limited in follow-up.

See the peer-reviewed pharmacology review .

Changes in Self-Perception, Identity and Emotional Meaning

Some psychedelic experiences involve a temporary change in the distinction between self and surroundings. Participants may describe unusual feelings of connection, detachment or altered identity.

Researchers investigate these reports using psychological questionnaires, behavioural tasks and neuroscience methods.

A person's interpretation may be influenced by their beliefs, expectations, culture and psychological history.

An experience that feels deeply meaningful is not necessarily beneficial in the long term. Disturbing changes in perception or self-experience may also require professional support.

Why Intensity Should Not Be Confused with Healing

A strong emotional reaction can create a memorable experience. It does not prove that a psychiatric disorder has been treated or that a traumatic event has been safely processed.

Responsible discussion distinguishes subjective meaning from clinically measured outcomes. Both are worth studying, but they answer different questions.

Original Ayahuasca Studies and What They Actually Tested

Scientific articles should be read in relation to their methodology. A clinical trial, a naturalistic observation and a study of subjective language cannot be used as interchangeable evidence of treatment effectiveness.

The following primary publications are relevant to the claims discussed in this guide.

What These Studies Do Not Establish

Taken together, the studies support continued investigation into ayahuasca's pharmacology and potential clinical applications.

They do not establish a universal therapeutic protocol, prove long-term safety for every population or validate commercial retreat claims about curing mental illness.

Ayahuasca Side Effects and What Large Surveys Show

Most clinical trials have relatively small samples and carefully selected participants. Large observational surveys provide different information, including experiences reported outside controlled research.

A study published in PLOS Global Public Health in 2022 analysed responses from 10,836 participants in the Global Ayahuasca Survey, collected between 2017 and 2019.

The findings included the following self-reported outcomes:

Around 88% of respondents who reported adverse mental health effects considered them part of a positive process of growth or integration.

That personal interpretation does not mean the adverse effects were medically harmless.

The survey was self-selected and retrospective. It cannot provide a definitive risk rate for all ayahuasca users or for a particular retreat.

Read the original Global Ayahuasca Survey publication .

Medical Risks, Contraindications and Drug Interactions

The medical safety of ayahuasca depends on far more than the experience of a ceremony leader.

Medical history, prescribed medication, psychiatric vulnerability and the composition of the preparation can substantially alter risk.

Medication Interactions and Serotonin Syndrome

Beta-carboline compounds in ayahuasca can inhibit MAO-A and interact with other substances affecting serotonin or related neurotransmitter systems.

Combining ayahuasca with certain antidepressants, other MAO inhibitors, stimulants or serotonergic substances may create dangerous interactions. Serotonin syndrome is one possible serious complication.

Interaction risks cannot be reduced to a universal rule such as stopping every medication for one or two weeks.

Some medications remain active for longer periods. Abrupt discontinuation of psychiatric medication can itself cause serious problems, including withdrawal symptoms or recurrence of illness.

Cardiovascular and Other Physical Risks

Ayahuasca can cause temporary increases in blood pressure and heart rate, along with nausea, vomiting and other physical effects.

People with cardiovascular conditions, uncontrolled hypertension or other significant medical problems require particular caution.

Pregnancy is another important reason to avoid exposure given insufficient human safety evidence and concerning preclinical findings.

People experiencing substantial vomiting or altered consciousness may also face risks related to dehydration, aspiration, falls and delayed access to emergency care.

Psychosis, Mania and Psychiatric Vulnerability

A personal or family history of psychotic disorders, bipolar disorder or mania raises important concerns about potential psychiatric complications.

Severe depression, recent suicidal thoughts, psychological instability and other significant psychiatric conditions should be assessed by qualified professionals.

Psychiatric diagnoses should not be treated as a simple checklist that a retreat operator can clear without clinical expertise.

Emergency Warning Signs

Severe confusion, high fever, unusual muscle rigidity, seizures, chest pain, major breathing difficulties or loss of consciousness require urgent medical attention.

A persistent psychiatric crisis or immediate risk of self-harm is also an emergency.

Emergency care should not be delayed because symptoms are interpreted as a spiritual process.

Peru's National Institute of Health published safety-related recommendations in August 2024, emphasising health conditions, medication risks and cultural responsibility.

Preparation, Screening and the Limits of Traditional Dieta Rules

The word dieta is often used in discussions of Amazonian plant traditions. Its meaning varies across cultural and ceremonial contexts.

Traditional restrictions may involve food, social behaviour or other elements of a particular practice.

These traditions should not be confused with a standardised medical protocol that makes ayahuasca safe for everyone.

Food Restrictions Are Not a Substitute for Medical Assessment

Because ayahuasca contains substances with MAO-A inhibitory activity, food and drug interactions may require medical consideration.

However, conventional dietary instructions circulated by retreat providers are not all supported by the same scientific evidence.

Avoiding selected foods does not remove the risk of a dangerous drug interaction or psychiatric reaction.

Why Individual Medical Disclosure Matters

A responsible health assessment considers the person's existing conditions, medications, psychiatric history and other relevant risk factors.

Information should be handled confidentially and reviewed by someone qualified for the decisions being made.

A participant should never be encouraged to conceal medication use or symptoms in order to qualify for a ceremony.

How to Evaluate an Ayahuasca Retreat in Peru

Choosing a retreat involves more than comparing photographs, accommodation, prices or enthusiastic reviews.

A remote jungle setting may be visually attractive, but its distance from medical care can become a serious concern during an emergency.

Safety-related questions should be answered clearly before any financial commitment is made.

Group Size and Individual Attention

Group size is relevant to staffing, supervision and emergency response. A small group does not automatically guarantee safety, just as a large group does not establish poor practice without examining its staffing and procedures.

A visitor should ask who is responsible for monitoring participants and what happens when someone requires individual support.

Retreat Prices and What They Include

Prices vary by location, duration, accommodation and service model.

There is no single verified price range that describes all ayahuasca retreats in Peru. Advertised packages may cover very different services.

Ask what is included in the quoted amount, particularly transport, accommodation, meals, screening, emergency arrangements, cancellation conditions and any follow-up support.

Higher prices do not by themselves demonstrate better safety or ethical standards.

Reviews and Testimonials

Testimonials are personal accounts, not independent medical evidence.

They can provide information about a visitor's experience, but should not replace verification of a provider's organisation, policies, safeguarding and emergency capacity.

Critical questions deserve clear answers without pressure, dismissal or claims that doubts indicate spiritual weakness.

Ayahuasca's Legal Status in Peru and Other Countries

Ayahuasca has no single worldwide legal status. The treatment of traditional preparations, isolated DMT, religious practice and commercial activities varies between jurisdictions.

National law and the circumstances of a particular activity matter. Cultural recognition should not be confused with an unrestricted commercial permission.

Peru

Peru recognises the traditional knowledge and uses of ayahuasca practised by Amazonian Indigenous communities as national cultural heritage under Resolution 836/INC of 2008.

This declaration protects cultural knowledge and practice. It is not a universal government-issued authorisation for commercial retreats.

Businesses may also face separate obligations concerning registration, accommodation, employment, taxation, health, consumer protection and other applicable matters.

Brazil

Brazil has a regulatory framework recognising ayahuasca's religious use within established conditions.

The rules should not be read as permission for every commercial activity involving the preparation.

United States

DMT is federally controlled in the United States. Certain religious organisations have obtained legally recognised exemptions or protections for specified religious use.

These arrangements are not a general authorisation for unrestricted possession, importation or commercial sale.

Russia and Other Jurisdictions

Russia applies restrictive drug-control laws relevant to DMT-containing materials and ayahuasca.

Other countries may prohibit the preparation, regulate it in specific contexts or leave important legal questions unresolved.

A claim that an activity is lawful in Peru does not establish its legality elsewhere.

International travellers should never assume they may transport ayahuasca across borders simply because they encountered it in a traditional setting.

For an international legal overview, consult ICEERS — Ayahuasca and the Law , while confirming current domestic requirements through relevant official authorities.

Integration and Mental Health After an Intense Experience

The end of an altered state does not necessarily mean that its emotional effects have ended.

Some people describe changes in mood, perspective or personal priorities after an experience. Others may have troubling thoughts, anxiety, sleep difficulties or problems making sense of what occurred.

The term integration is often used for the process of reflecting on an experience and its relationship to daily life.

It is not a single, scientifically standardised treatment.

When Professional Support Matters

Persistent distress, impaired functioning, severe insomnia, unusual beliefs accompanied by deterioration in wellbeing, or worsening psychiatric symptoms should be evaluated by a qualified mental health professional.

Experiences should not be automatically interpreted as a necessary stage of spiritual development when they may signal a health problem.

Changes That Last

Research continues to examine whether observed psychological changes remain over longer periods and which factors predict different outcomes.

A reported increase in wellbeing after an experience does not, on its own, establish a permanent or universal effect.

Indigenous Knowledge, Commercialisation and Environmental Responsibility

Global interest in ayahuasca has created new economic activity around Amazonian traditions.

Retreat centres, tourism operators, transport providers, accommodation businesses and other services may all participate in this economy.

Economic activity is not necessarily incompatible with cultural respect. But commercial success alone does not demonstrate ethical practice.

Fair Treatment of Traditional Practitioners

Responsible cooperation should consider fair compensation, clear agreements, appropriate attribution and respect for community knowledge and cultural boundaries.

Traditional practitioners should not be represented merely as decorative elements of a tourism product.

Nor should a business claim the endorsement of an Indigenous community without a genuine basis for doing so.

Cultivation and Forest Protection

Growing demand for plants associated with ayahuasca raises questions about responsible sourcing, cultivation and pressure on wild populations.

The actual conservation status and harvesting pressure of a plant must be established from suitable evidence, rather than inferred from its popularity.

Responsible sourcing may involve lawful cultivation, appropriate local management and respect for Indigenous and community rights.

WELES Group's Jungle Synergy Project addresses broader questions concerning rainforest stewardship and the conservation of Amazonian habitats.

Respecting Tradition Without Romanticising It

Cultural respect does not require presenting every traditional claim as medically proven.

It is possible to recognise the historical importance of a practice while still asking difficult questions about safety, evidence, consent and accountability.

Both forms of responsibility matter.

Frequently Asked Questions About Ayahuasca

The following answers address questions about safety, evidence, traditional use and modern retreat practices.

Scientific and Official References

The distinction between scientific evidence, cultural practice and commercial claims is central to this guide.

These references provide the principal research and institutional sources used in the article.

• Palhano-Fontes et al. — Randomised placebo-controlled depression trial . Psychological Medicine, published online in 2018.
• Jiménez-Garrido et al. — Mental health and quality of life in first-time users . Scientific Reports, 2020.
• Uthaug et al. — Placebo-controlled retreat study . Psychopharmacology, 2021.
• Bouso et al. — Global Ayahuasca Survey adverse-effects analysis . PLOS Global Public Health, 2022.
• Cruz et al. — Subjective experiences in participants with and without depression . Scientific Reports, 2023.
• First-in-human research on alternative DMT and harmine administration . Frontiers in Pharmacology, 2023.
• Ayahuasca pharmacology, safety and therapeutic effects — peer-reviewed review , 2024.
• Peru Ministry of Culture — Resolution 836/INC-2008 . Recognition of traditional Indigenous ayahuasca knowledge and uses as national cultural heritage.
• Peru National Institute of Health — Ayahuasca safety recommendations , 2024.
• ICEERS — Ayahuasca and the Law . Comparative legal information concerning traditional, religious and other use.