Resources 2019-12-11T19:02:43+00:00




Robert Masters & Jean Houston

AKA ‘The Varieties’. A comprehensive and tactful academic treatise of psychedelic experience based on guided sessions with hundreds of healthy well-educated subjects. The words between these pages reveal the elusive and multifaceted effects of classical psychedelics for all to witness in plain, worldly English, leaving no stone un-turned. Easily one of the most masterful scholarly works ever written on visionary experiences. Authentic, intimate, highly sensible, judicious in its humour, and brimming with articulate archetypal examples. A highly accessible classic that stands the test of time–an audacious monument in terrain otherwise brimming with myst and fairytales. If nothing more, it defies the ineffable. One of the single most important books ever written, and worth changing your mind about picking up Pollan this winter.


Benny Shanon

Outstanding. From the book description: This is a pioneering cognitive psychological study of Ayahuasca, a plant-based Amazonian psychotropic brew. Benny Shanon presents a comprehensive charting of the various facets of the special state of mind induced by Ayahuasca, and analyzes them from a cognitive psychological perspective. He also presents some philosophical reflections. Empirically, the research presented in this book is based on the systematic recording of the author’s extensive experiences with the brew and on the interviewing of a large number of informants: indigenous people, shamans, members of different religious sects using Ayahuasca, and travellers. In addition to its being the most thorough study of the Ayahuasca experience to date, the book lays the theoretical foundations for the psychological study of non-ordinary states of consciousness in general.


Lewis Lewin

From the book description: The publication of Louis Lewin’s Phantastica in 1924 began an era of ethnobotany that is still flourishing today. Until Lewin, books on the use of drugs were purely works of anthropology, concerned with how people used these plants, rather than how the plants produced their famous effects. Lewin, a world-renowned pharmacologist and toxicologist, was fascinated by both, and Phantastica was the first book to bring scientific insights to a survey of the use of drugs around the world. Lewin traveled extensively and acquired an astonishing variety of knowledge, reflected in this book, which provides detailed information on all major drugs of the time, including opium, cocaine, heroin, cannabis, peyote, fly agaric, henbane, datura, alcohol, kava, betel, coffee, tea, cocoa, and, of course, tobacco.


Torsten Passie

Great scholarly book by a great scientist. A lot like his and Hintzen’s The Pharmacology of LSD – more of a dense and detailed work of science than a casual coffee table read. Includes a much needed discussion on the sub-perceptual idea. Outlines prior research with psycholytic and active placebo doses of various psychedelics.


Mike Jay

From the book description: This eye-opening history of mescaline extends from the ancient Americas to the present day. Offering a rich narrative of mescaline’s many lives, Mike Jay draws on botany, pharmacology, ethnography, and the mind sciences as he explores how its mind-altering properties have been used by shamans, scientists, artists, and philosophers.


Wade Davis

Harvard scientist and anthropologist Wade Davis was the protégé of the eminent biologist and celebrated explorer Richard Evans Schultes, known as the father of modern ethnobotany (whom brought 30 000 plant specimens back from the Amazon, 2000 of which were medicinal plants previously unknown to science). Described as “a rare combination of scientist, scholar, poet and passionate defender of all life’s diversity,” Wade is one of the most talented and dexterous linguistic craftsmen of our time, and we are beyond blessed to have such an articulate mind to tell the tale of Richard Evans Schultes and his legacy through his own eyes and through experiences with the man himself.

Wade Davis is also well-known for discovering the phenomenon of zombis in Haitian vodoun culture, which he told inThe Serpent And the Rainbow.


Adam L. Halberstadt, Franz X. Vollenweider, David E. Nichols (Eds.)

Medical volume. Each chapter is an independent academic research paper. From the back cover: This volume brings together the latest basic and clinical research examining the effects and underlying mechanisms of psychedelic drugs. Examples of drugs within this group include LSD, psilocybin, and mescaline. Despite their structural differences, these compounds produce remarkably similar experiences in humans and share a common mechanism of action. Commonalities among the substances in this family are addressed both at the clinical and phenomenological level and at the basic neurobiological mechanism level. To the extent possible, contributions relate the clinical and preclinical findings to one another across species. The volume addresses both the risks associated with the use of these drugs and the potential medical benefits that might be associated with these and related compounds.


Christian P. Müller & Barry L. Jacobs (Eds.)

Medical volume. Each chapter is an independent academic research paper.

The work is divided into four parts:
1. Functional anatomy of the serotonergic system.
2. Review of the neurophysiology of the serotonergic system and its single components.
3. Involvement of serotonin in behavioural organization.
4. Serotonin in behavioural pathologies and psychiatric disorders.


Stephanie Hancock & William McKim

A well-organized textbook on the fundamentals of how drugs work. From the book description: Stephanie Hancock describes basic pharmacological concepts of drug administration and pharmacokinetics, research methodology and clinical trials, tolerance and withdrawal, drug conditioning, addiction processes, and the neuroscience of drug action. In each chapter, these concepts are applied to different classes of recreational and therapeutic drugs within a historical and social backdrop. The Eighth Edition has been substantially revised and updated to include the newest research findings and real-world examples related to drug use and addiction.


David J. Linden

Introductory psychology. This book is a fun read and a good undergraduate introduction to the neuropsychology of why we like and want what we do.

Dr. Linden is a neurobiologist and professor of neuroscience at the Johns Hopkins University School of Medicine, editor in chief of The Journal of Neurophysiology, and has published other works such as The Accidental Mind: How Brain Evolution Has Given Us Love, Memory, Dreams, and God

Psychedelic Retreats and legal exemptions

If you’re thinking of traveling to the Amazon for a retreat, read this (ICEERS).

Explore facilitators, travel guides, work exchange, events, retreats, shamans and ceremonies throughout the world, with testimonials.

Search and sort by highest rated, most affordable, and by category: Ayahuasca, Iboga, Magic Mushroom, Peyote, San Pedro and Kambo retreats.

Directory of psilocybin retreats and private sessions.

Search psychedelic teachers, leaders, retreats and centers with reviews around the world.

Trusted Retreat Finder
Personal retreat curator that gets you personalized recommendations within a week.

Search for ayahuasca retreats and reviews by country and by city.

Religious organizations with legal exemption to use psychedelics in Canada:

Céu do Montréal / The Eclectic Centre for the Universal Flowing Light

Céu da Divina Luz do Montreal

Église Santo Daime Céu do Vale de Vida in Val-David, Quebec

Céu de Toronto

Beneficient Spiritist Center União do Vegetal

Risks and safety


If you plan on traveling for a retreat, read this (ICEERS)

MAPS: How to Work with Difficult Psychedelic Experiences

The Zendo Harm Reduction Manual (pdf)

Harm Reduction International – Global State of Harm Reduction 2018 (pdf)

The Manual of Psychedelic Support (pdf)

Psychedelics can be used safely…

  • The Global Drug Survey[1] has consistently found psilocybin and LSD to be the least addictive of all drugs.
  • The UK Independent Scientific Committee on Drugs deemed classical psychedelics to be among the least damaging to the self and to society, compared to all other drugs.[2]
  • In over 2000 carefully controlled clinical trials, where participants were properly screened for predisposition to psychosis and other contraindications, no serious adverse events were recorded,[3] and cases of Hallucinogen Persisting Perceptual Disorder (HPPD) are rare.[4]
  • Psilocybin used in the clinical setting is considered safe, well tolerated, showing no signs of neurotoxicity.[3]
  • Psychedelic use does not appear to be associated to negative mental health. In fact data suggest the opposite may be true.[5]
  • A deluge of research demonstrates that these experiences are often rated in 7/10 cases as the single or among the top five most meaningful experiences in the lives of participants, and a single experience in a controlled setting can provide profound and sustained relief to those suffering from addictions, depression, and anxiety.[6]

but they do carry risks.
In uncontrolled sets and settings, and in those predisposed to psychotic disorders, psychedelics can lead to significant problems. Psychedelics

  • may induce Hallucinogen Persisting Perceptual Disorder (HPPD) under circumstances involving intense fear or panic that goes unsoothed during the psychedelic experience.[4] See A Very Brief Summary of HPPD, based on Halpern, Lerner & Passie (2016).
  • should not be used by those with schizophrenia or bipolar disorder, or history of these in immediate family.[3]
  • can interact with antidepressant and other medication, (such as SSRIs, MAOIs and UDG enzyme modulators)[3]
  • decrease the threshold for seizures[3]
  • may affect a quarter of the population more dramatically due to a known serotonin 2A genetic polymorphism that disrupts sensory gating.[7]
  • may lead to anxiety, dysphoria, hypertension, exhaustion and general incapacitation, and disrupt vigilance, working memory, cognitive flexibility, and communication, and may lead to paranoid ideation or ideas of reference; at the highest doses, may lead to sense of disconnection from body and environment, and the loss of ability to distinguish fantasy from reality.[3][8]
  • may produce experiences beyond the user’s ability to conceptualize using existing world-models and language, and require a period of integration that may be understood as extending off into the following days, weeks or years, and may require specialized social support.

Benzodiazepines, antipsychotics and hypertension medication are typically kept on hand in case of emergencies.[3] Interruptions and uncertain environments & people should be completely eliminated, and the user should not operate heavy machinery or engage in activities that require sustained attention and carry a hazard.

Find support providers at Psychedelic.Support and PsychedelicsToday

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[1] Global Drug Survey (2018)

[2] Nutt, D. J., King, L. A., & Phillips, L. D. (2010). Drug harms in the UK: a multicriteria decision analysis. The. Lancet, 376(9752), 1558–1565. doi: 10.1016/S0140-6736(10)61462-6

[3] Huston, P., Cozzi, N., Vollenweider, F., Nichols, D., Greer, G., Johnson, M., May, D., Ross, S., Jerome, I. (2018) Psilocybin Investoator’s Brochure V2.0.  Usona Institute. 

[4] Halpern, J. H., Lerner, A. G., & Passie, T. (2016). A Review of Hallucinogen Persisting Perception Disorder (HPPD) and an Exploratory Study of Subjects Claiming Symptoms of HPPD. In A. Halberstadt, D. Nichols, F. X. Vollenweide (Eds), Behavioral Neurobiology of Psychedelic Drugs (pp. 333-360). doi:10.1007/7854_2016_457

[5] Johansen, P., & Krebs, T. S. (2015). Psychedelics not linked to mental health problems or suicidal behavior: a population study. J. Psychopharmacol., 29(3), 270–279. doi: 10.1177/0269881114568039

[6] Carhart-Harris, R. L., & Goodwin, G. M. (2017). The Therapeutic Potential of Psychedelic Drugs: Past, Present, and Future. Neuropsychopharmacology, 42(11), 2105-2113. doi:10.1038/npp.2017.84

[7]  Vollenweider, F. X. [Horizons]. (2011). Neuronal Networks and Neurotransmitter Dynamics underlying Altered States of Consciousness. Retrieved from

[8] Preller, K. H., & Vollenweider, F. X. (2016). Phenomenology, Structure, and Dynamic of Psychedelic States. in Behavioral Neurobiology of Psychedelic Drugs. Current Topics in Behavioral Neurosciences, 221-256. doi:10.1007/7854_2016_459