Erowid– easily the most extensive collection of information pertaining to psychoactive substances.
Multidisciplinary Association for Psychedelic Studies (MAPS) – a non-profit organization developing medical, legal, and cultural contexts for people to benefit from the careful uses of psychedelics and marijuana.
Heffter Research Institute– one of the major organizations in the United States conducting FDA-approved research on psychedelic substances. Here you can see videos and information about their research, read updates from the organization, and donate to support their research.
International Center for Ethnobotanical Education Research and Services (ICEERS)– an organization which works to integrate traditional plants into society and protect the environment and ethnobotanical practices of indigenous people. Their website contains information about ayahuasca and iboga, legal information and defense, and public policy.
The Third Wave– thorough and organized information about the major psychedelics, information on microdosing, and a great podcast.
Kahpi– an educational organization which offers online courses about ayahuasca.
Chacruna– articles about the science, spirituality, and culture of psychedelics from diverse and reputable authors.
PsychePlants is a website by ICEERS which offers detailed evidence-based information on a few select entheogens, integration and crisis support, and even an online course for healthcare professionals.
Psychedelic.Support has a network of clinics, therapists, counselors, and doctors that offer services (online and in-person) for psychedelic and plant medicine integration, transformational preparation, psychological and physical health, and personal growth. Search profiles, find integration events and professional trainings, and access free resources from the collective knowledge of the Psychedelic Support Network.
The Fellowship of the River by Joe Tafur
Ayahuasca Shamanism in the Amazon and Beyond by Beatriz Labate and Clancy Cavnar
Ethnopharmacologic Search for Psychoactive Drugs: 50 Years of Research (1967-2017) edited by Dennis McKenna
Zig Zag Zen: Buddhism and Psychedelics edited by Allan Badiner
Mystic Chemist: The Life of Albert Hoffman and His Discovery of LSD by Dieter Hagenbach & Lucius Werthmüller
Birth of a Psychedelic Culture by Ram Dass & Ralph Metzner
Ayahuasca Reader: Encounters with the Amazon’s Sacred Vine edited by Luis Eduado Luna & Steven F. White
Where the Gods Reign: Plants and Peoples of the Colombian Amazon by Richard Evans Schultes
The Harvard Psychedelic Club by Don Lattin
PIHKALand TIHKAL by Alexander and Ann Shulgin
The Doors of Perception by Aldous Huxley
Foods of the Gods by Terrence McKenna
DMT: The Spirit Molecule by Rick Strassman
The Ultimate Journey: Consciousness and the Mystery of Death by Stanislav Grof
LSD: Doorway to the Numinous by Stanislav Grof
The Encyclopedia of Psychoactive Plants by Christian Ratsch
The Secret Teachings of Plants by Stephen Harrod Buhner