Erowid is a US-based organisation that provides ‘reliable, nonjudgmental information about psychoactive plants, chemicals, and related issues’.

Bluelight is an ‘international, online, harm-reduction community committed to reducing the harms associated with drug use’.

The Multidisciplinary Association for Psychedelic Studies (MAPS) is a US-based ‘non-profit research and educational organisation that develops medical, legal, and cultural contexts for people to benefit from the careful uses of psychedelics and marijuana’.

DanceSafe is a public health organisation, founded in California, that provides ‘a nonjudgmental perspective to help support people who use drugs in making informed decisions about their health and safety’.

PsychonautWiki is a ‘community-driven online encyclopaedia that aims to document the field of psychonautics in a comprehensive, scientifically grounded manner’.

The Psychedelic Renaissance (2nd ed, 2017) by Ben Sessa is an excellent introductory textbook that describes the cultural history of psychedelics, and is the most up-to-date review of contemporary work in the field.

Consciousness Medicine: Indigenous Wisdom, Entheogens, and Expanded States of Consciousness for Healing and Growth (2019) by Françoise Bourzat with Kristina Hunter is a ‘comprehensive guide to the safe and ethical application of expanded states of consciousness for therapists, healing practitioners, and sincere explorers’.

How to Change Your Mind: What the New Science of Psychedelics Teaches Us About Consciousness, Dying, Addiction, Depression, and Transcendence (2018) by Michael Pollan is a ‘brilliant and brave investigation into the medical and scientific revolution taking place around psychedelic drugs ­– and the spellbinding story of his own life-changing psychedelic experiences’.