Course Provider
Door of Perception is the practice of Dorien, a Netherlands-based psychedelic guide, coach, and medical anthropologist who co-founded the OPEN Foundation in 2007 and brings over 20 years of experience in harm reduction at festivals such as Kosmicare, Zendo, and Psycare. She offers online courses for safe DIY psychedelic journeys, one-on-one psilocybin truffle sessions in Amsterdam, and training workshops for guides and mental health professionals.
Door of Perception looks like a seasoned, independent psychedelic guide rather than a formal school. Its strongest suit is practical, safety-first preparation for people seeking legal psilocybin truffle work in Amsterdam, plus consultative support for newer guides and curious public users. The lineage is credible in the Dutch field, with Dorien Tatalas citing long involvement with OPEN Foundation, festival harm reduction, and work alongside ADEPT, but this is still a practitioner-led offering rather than an accredited academic programme.
Best for people wanting a carefully held legal truffle session in Amsterdam, or self-directed explorers who want a structured online toolkit for responsible use. It also suits beginning guides and allied professionals who want supervision-style consultation rather than a formal certification.
For masterclasses, Dorien says attendees should already have some experience guiding psychedelic journeys and ideally around twenty personal psychedelic experiences plus at least three years of serious interest and study. For one-to-one sessions, the site indicates screening and an introductory call, but no formal licence or profession is stated as required.
No formal external accreditation, CME/CE credit, or university certification is stated on the sources reviewed. Dorien does state membership of the Guild of Guides in the Netherlands and adherence to its Code of Conduct, and she says she occasionally works as an experiential facilitator with ADEPT, a two-year training programme for therapists learning to work with psychedelics.
Pricing was not visible in the sources reviewed. The site frames the service as bespoke and preparatory, with 1-on-1 truffle work in Amsterdam including screening and a minimum of three meetings, plus an online toolkit and separate consultations for guides and professionals.
Learners or clients should walk away with practical preparation, safety, and integration skills for psychedelic journeys, plus clearer intention-setting and a grounded understanding of what the work can and cannot offer. For beginning guides, the implied outcome is more confidence, ethical awareness, and practical guidance for starting a responsible practice, but no formal credential is advertised.
Linked Courses
2
Active Listings
0
Primary Formats
Live Classes, Self-paced
Programs linked directly to this provider in the Blossom course dataset.
By Door of Perception
Master Class on guiding truffle journeys safely and responsibly. Intended for starting or aspiring psychedelic guides and coaches with some prior experience in guiding, sitting, or harm reduction work.
By Door of Perception
The Meaningful DIY Journey course is designed for those ready to embark on their (first) psychedelic experience with confidence and the necessary tools for a safe and meaningful journey.
Delivery: Online + Self-paced
No medicine self-experience listed
Reference points selected from shared training modalities, learner audience, level, delivery format, pricing, and location.