Ayahuasca: Tradition, Science and U.S. Law
Ayahuasca is a plant brew from the upper Amazon basin, used in ceremony by Indigenous peoples of the region for generations and taken under the guidance of experienced healers. Over the last three decades it has traveled — into American retreat marketing, into clinical research, into the language of “plant medicine.” This piece covers where it comes from, what the ceremony traditionally is, what the research actually shows, and the part Americans most often get wrong: the legal situation in the United States.
Contents
Ayahuasca is a traditional plant brew from the upper Amazon, made from the Banisteriopsis caapi vine and usually chacruna leaves and taken in ceremony under the guidance of a curandero; the name comes from Quechua and is usually rendered vine of the soul. The active compound is DMT, whose breakdown is slowed by the MAO inhibitors in the caapi vine. In the United States DMT is a Schedule I controlled substance; narrow religious exemptions exist for the Uniao do Vegetal after the Supreme Court's unanimous 2006 RFRA ruling and for specific Santo Daime congregations after a 2009 federal ruling in Oregon, but no exemption covers a commercial retreat, and Oregon's psilocybin law does not cover ayahuasca. Ingestion can cause strong physical reactions and intense psychological states and is potentially fatal with antidepressants or cardiac disease. Controlled trials for depression and trauma are underway but early and medically supervised. This is informational only and is not medical advice or a guide to use.
Ayahuasca is traditionally prepared from the Banisteriopsis caapi vine and usually chacruna leaves and taken in ceremony with icaros under the guidance of experienced healers.
Source/tradition: Ceremonial traditions of Indigenous cultures of the upper Amazon basin; ethnobotanical documentation
The pharmacologically active compound is DMT; the MAO inhibitors in the caapi vine slow its breakdown in the body.
Source/tradition: Pharmacological literature on DMT and monoamine oxidase inhibition
DMT is listed in Schedule I of the U.S. Controlled Substances Act, 21 U.S.C. § 812.
Source/tradition: Controlled Substances Act, 21 U.S.C. § 812
In Gonzales v. O Centro Espirita Beneficente Uniao do Vegetal (2006) the Supreme Court held unanimously that the government had not justified barring the church's sacramental ayahuasca use under the Religious Freedom Restoration Act.
Source/tradition: Gonzales v. O Centro Espirita Beneficente Uniao do Vegetal, 546 U.S. 418 (2006)
Colorado's Proposition 122 (2022) decriminalized personal use and sharing of certain plant substances including DMT at state level; Oregon's Measure 109 covers psilocybin services only and not ayahuasca.
Source/tradition: Colorado Proposition 122 (2022); Oregon Measure 109 (2020)
Ingestion can cause strong physical reactions and intense psychological states and can be life-threatening with pre-existing conditions or certain medications, particularly serotonergic drugs.
Source/tradition: Documented risks and interactions; clinical literature on serotonin syndrome
Purging and night-time sessions guided by icaros are understood within the tradition as part of the process rather than as side effects.
Source/tradition: Ceremonial practice as described by practitioners of the upper Amazon tradition
Ayahuasca heals depression, trauma or addiction.
Source/tradition: Controlled trials are at an early stage; no approved treatment exists and self-directed use is a different activity entirely
Paying for a commercial retreat confers the religious protection the UDV and Santo Daime congregations obtained in court.
Source/tradition: The rulings are narrow and congregation-specific; no U.S. licensing or oversight exists for facilitators
VERIFIED = verifiable in scientific or official sources · TRADITIONAL = historically or culturally recorded · LIVED PRACTICE = widely practiced, experiential knowledge · NOT PROVEN = spiritual interpretation, not scientifically established.
Read this first
DMT is a Schedule I controlled substance under U.S. federal law, and ayahuasca contains it. This article is informational. It is not a how-to, not an endorsement, and not medical advice. Combining ayahuasca with antidepressants or certain other medications can be fatal. If you have taken something and feel unwell, call Poison Control at 1-800-222-1222. For a mental-health crisis in the U.S., call or text 988.
What ayahuasca is
Traditionally it is a decoction of two plants: the vine Banisteriopsis caapi and, most often, the leaves of the chacruna shrub (Psychotria viridis). The word comes from Quechua and is usually rendered vine of the soul or vine of the dead. In the cultures of the upper Amazon it is understood as a sacred medicine, taken with a curandero or shaman present.
The pharmacology is the reason it works at all as a drink. The active compound is DMT, which the digestive system would normally break down before it reached the bloodstream. The caapi vine contains MAO inhibitors, which slow that breakdown. Two plants, neither sufficient alone. Whatever else you think about the tradition, that combination is a genuine piece of applied botanical knowledge.
The ceremony, as it is actually kept
In the traditional setting the point is not intoxication. It is healing and connection. A session usually runs at night, guided by ícaros — songs the healer uses to shape the course of the evening. Purging, physical and emotional, is understood as part of the process rather than a side effect. Our overview of shamanic journeying places the wider practice; ceremonial cacao covers the other South American plant ceremony, the one with no legal or pharmacological hazard attached.
The U.S. legal picture — which is not what most retreat marketing implies
This is the section the German original could not write, and it is the one that matters most to an American reader.
| Situation | Status |
|---|---|
| DMT generally | Schedule I under the federal Controlled Substances Act. Possession is a federal offense. |
| União do Vegetal (UDV) | Protected. In Gonzales v. O Centro Espírita Beneficente União do Vegetal (2006) the Supreme Court ruled unanimously under the Religious Freedom Restoration Act that the government had not justified barring the church's sacramental use. |
| Santo Daime | A federal district court in Oregon ruled in 2009 in favor of a Santo Daime congregation on similar RFRA grounds. That protection runs to the specific congregations in the case, not to anyone who invokes the name. |
| Oregon psilocybin services | Measure 109 created a regulated psilocybin framework. It does not cover ayahuasca or DMT. |
| Colorado Proposition 122 | Decriminalized personal use and sharing of certain plant substances including DMT for adults. It did not legalize sale, and it does not change federal law. |
| A retreat that sells you a seat | Not covered by any of the above. A commercial ceremony is not a church, and paying for one does not create a religious exemption. |
Two things follow. First, the religious exemptions are narrow, specific and hard-won — they are not a general legal category anyone can enter. Second, there is no licensing body, no credentialing standard and no complaint process for ayahuasca facilitators in the United States or for the retreats Americans fly to in Peru, Costa Rica and Ecuador. Nobody is checking anyone's training. That is not a reason to panic; it is a reason to stop treating a retreat brochure as a safety document.
What the research shows, and what it does not
Research groups have studied the brew in controlled trials, including for depression and trauma, and early results point to possible potential. Three qualifications belong with that sentence every time it is made. The work is early. It happens exclusively in medically supervised settings with screening, dosing control and someone trained standing by. And a supervised trial and a self-directed experiment are not the same activity in any respect that matters.
No agency has approved ayahuasca as a treatment for anything. Nothing in the literature supports the claim, common in retreat copy, that it cures depression, trauma or addiction.
Risks, in plain terms
- Drug interactions. The MAO inhibitors in the caapi vine interact dangerously with SSRIs, SNRIs, MAOIs, lithium, tramadol, triptans, some cold medicines and stimulants. The result can be serotonin syndrome, which can be fatal. This is the single most important paragraph on this page.
- Cardiovascular strain. Blood pressure and heart rate rise. Existing cardiac disease is a serious contraindication.
- Psychiatric risk. A personal or family history of psychosis, bipolar disorder or schizophrenia is a contraindication that responsible facilitators screen for — and that many do not.
- Physical reactions. Nausea, vomiting and diarrhea are expected, not exceptional.
- Setting. Deaths of foreign visitors at Amazon retreats have been reported over the years, sometimes involving undisclosed medications, sometimes involving no medical support on site and hours to the nearest hospital.
The Shaman and Ayahuasca — Don José Campos on Sacred Realms (paperback)
If your interest is the tradition rather than the trip, read a Peruvian curandero describing the practice in his own terms. It is the part of the subject that retreat marketing skips, and the part that explains why the ceremony has a shape at all.
$27.99
See the bookFrom the Amazon outward — and the argument that came with it
For most of its history the brew was known almost exclusively within Amazonian forest cultures. In twentieth-century Brazil, syncretic churches — Santo Daime and the União do Vegetal — placed it in a religious frame and, in some countries, won legal recognition for ceremonial use. From the 1990s on, global interest in consciousness and alternative healing pulled it into international view.
That arrival brought a real argument with it, and it has not been settled: cultural appropriation, ceremony tourism, and who gets to profit from Indigenous knowledge. Amazonian communities have watched a practice they maintained become a product sold by people with no relationship to them. An American reader who takes the subject seriously has to hold that question alongside the pharmacology.
Integration: the part everyone skips
In the contemporary conversation, integration — deliberately working through an experience afterward, in ordinary life — is treated as the decisive piece, and it is the piece retreats under-serve most. Reflection, writing, time outdoors, people you can speak to honestly, and a quiet steady ritual all carry more weight than the ceremony they follow. This is also true of experiences that involve no substance at all.
Temple tip: the question that sorts a retreat in one email
Ask, in writing, before paying anything: What is your medical screening, who reviews it, what medications disqualify me, what medical support is on site, and how far is the nearest hospital? A serious operation answers all five specifically. A vague or offended answer is the answer.
The same qualities, without the substance
Much of what people go looking for — letting go, clarity, a sense of connection — can be cultivated on gentler and safer routes. Breathwork, long silence, deliberate time in nature and ritual smoke are old tools for the same intention. Ceremonial cacao is the South American plant ceremony you can legally keep at home: warming and alert, with no intoxication. Regular sitting practice and inner-sense work offer a protected frame for looking inward without legal or medical exposure.
What we do not promise
- That ayahuasca heals depression, trauma or addiction. Controlled research is early and no approval exists.
- That any ceremony, retreat or facilitator is safe. There is no U.S. licensing or oversight for any of them.
- That the religious exemptions extend to commercial retreats or to individuals. They do not.
- That this article is guidance for use. It is not, and it is not a substitute for medical or psychological care.
Frequently asked questions
What is ayahuasca?
A traditional plant brew from the upper Amazon, made from the Banisteriopsis caapi vine and usually chacruna leaves, taken in ceremony under the guidance of an experienced healer.
Is ayahuasca legal in the United States?
Generally no. DMT is a Schedule I controlled substance federally. Narrow religious exemptions exist for the União do Vegetal, following a 2006 Supreme Court ruling, and for specific Santo Daime congregations after a 2009 federal ruling in Oregon. Colorado's Proposition 122 decriminalized personal use of certain plants at the state level. None of that covers a commercial retreat.
What are the main risks?
Dangerous interactions with antidepressants and several other medications, which can cause potentially fatal serotonin syndrome; cardiovascular strain; psychiatric risk for people with a history of psychosis or bipolar disorder; and strong physical reactions. Setting matters too — many retreats have no medical support.
Does Oregon's psilocybin law cover ayahuasca?
No. Measure 109 created a regulated framework for psilocybin services only. It does not cover ayahuasca or DMT.
Is the science settled?
No. Controlled trials for depression and trauma are underway and early results suggest possible potential, but the research is at an early stage, is conducted only under medical supervision, and has produced no approved treatment.
What does integration mean?
Deliberately working through an experience afterward in ordinary life — through reflection, writing, time outdoors, honest conversation and a steady quiet ritual. It applies to any intense experience, substance or not.
Sources and further reading
- Controlled Substances Act, 21 U.S.C. § 812 — DMT listed in Schedule I.
- Gonzales v. O Centro Espírita Beneficente União do Vegetal, 546 U.S. 418 (2006).
- U.S. District Court for the District of Oregon, 2009 ruling on Santo Daime sacramental use under RFRA.
- Oregon Measure 109 (2020), psilocybin services; Colorado Proposition 122 (2022), Natural Medicine Health Act.
- Pharmacological literature on DMT and monoamine oxidase inhibition; clinical reviews of serotonin syndrome.
- Ethnobotanical documentation of ceremonial practice in the upper Amazon basin.
- In the magazine: What ceremonial cacao is · Shamanic journeying, the drum method · Four families of meditation technique · A cacao ceremony at home
- Poison Control (U.S.): 1-800-222-1222 · Suicide & Crisis Lifeline (U.S.): call or text 988
- Questions about an order or a product: 28@templeofdesire.com
This piece informs about a culturally and scientifically debated subject. It is not an invitation to use, and it makes no claim of efficacy.