About Synthesis

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Synthesis offers legal, medically supervised, and scientific based psychedelic retreats in Amsterdam. We make the psychedelic experience accessible for curious individuals who want to utilize moderate-to-high doses of psilocybin truffles to catalyze creative breakthroughs, explore consciousness, find meaning, improve confidence, and search for a mystical experience. Find out here what our customers say about us.

A Recipe For Transformational Wellness

Synthesis spearheads a new era in the integration of psychedelics into modern culture. In carefully curated settings, these remarkable molecules can be agents of transformational experiences. They can restore our sense of wonder, and foster a renewed sense of connection; to ourselves, others, and the natural beauty of the wider world.

Our name is a tribute to our core mission; to catalyze synthesis between modern research, ancient shamanistic rituals, and spiritual practices through the ages, bringing these together to create a recipe for transformative wellness.

Through ritual and ceremony, open dialogue, bodywork, meditation, the power of sound, psychedelic education, and through the guidance of professional facilitators, psychedelics have the power to restructure thoughts, sharpen perceptual lenses, and awaken new forms of consciousness. This sense of possibility is what you will discover at Synthesis; a locus for true transformation and expanding horizons.


 The Retreat Team

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Natasja Pelgrom

Lead Facilitator

Natasja is a Holistic Transformational Mentor with significant experience in counseling; life and business coaching with over ten years of practice.

She is a highly intuitive guide and has trained, assisted and facilitated in 500+  psychedelic ceremonies.

As a medicine woman operating internationally, she curates medicine retreats and teaches empowerment workshops.

Natasja brings a rich and extensive resource of skills to Synthesis.

Daan Keiman

Lead Facilitator

Daan holds an MA in Spiritual Care and previously worked for the renowned mental health care and addiction research institute, the
Trimbos-institute. His experience with guiding and caring for people in altered states of consciousness spans over a decade.

He draws from his personal contemplative practices, psychedelic research and his professional experiences to create compassionate and powerful containers for personal transformation. As an avid explorer of consciousness, he is highly capable of guiding others through the landscapes of the mind.  

Tessa Van de Ven

Retreat Facilitator

In her role as a retreat facilitator, Tessa takes individuals on introspective journeys to connect with their true authentic self. Psychedelics entered her world when she experienced a challenging identity crisis and sought out nature-based healing modalities.

This exploration of self-healing led her towards various traditional and modern psychedelic ceremonies working with skilled guides and studies in the transformative potential of natural compounds. Tessa's strong intuitive abilities, empathy skills and deep connection with psychoactive plants make her an excellent guide on your journey through expanded states of consciousness.

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Sven Kimenai

Breathwork Coach
& Assistant Facilitator

Sven has a background in Psychobiology & Supplement Development. After his studies, he went on a path of exploring science-based methods for self-healing. He became a Wim Hof Method Instructor, a Breathwork Facilitator and started studying Psychedelics for transformational healing. He emphatically empowers others to step out of their comfort zones and supports them in exploring their inner landscapes. His aim is to research and apply psychedelics and breathwork, to catalyze personal growth, insight & human connection.


 The Corporate Team

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Martijn Schirp

Co-Founder & Executive Director

Martijn is the Co-Founder of HighExistence and Apotheosis, has a background in interdisciplinary science and philosophy, and with a strong foundation in coaching and entrepreneurship, he aims to make psychedelic tools accessible in a safe, legal, and modern context.

Martijn has been writing and speaking about psychedelics, interviewing experts in this field, and helped organize The Interdisciplinary Conference on Psychedelics Research 2016 in Amsterdam.

He first reached out to psychedelics when he was in search of new perspectives and clarity to reorient his way of being. Today it is his mission to lower the barrier for deep transformation.

Myles Katz

Director of
Business Development

Myles has spent his career on three different continents launching or leading VC-funded startups with technological, socially responsible, and green initiatives.

He has a strong belief that business and capitalism, when incentivized correctly, can be the most powerful tools we have to make positive, sustainable change in our modern society, and is excited to bring his experience to the psychedelic movement.

Specifically with Synthesis, Myles looks forward to developing an impact-focused business model that increases access to safe, legal and professionally-guided psychedelic experiences and sets an example for what a psychedelic-integrated future can look like.


Rachel Aidan

Director of Operations

Rachel is a serial entrepreneur, conscious business and leadership coach, speaker, and conscious social change facilitator with nearly 20 years of experience working with clients across the U.S., Europe and East Africa.

In addition to her passion for conscious business and leadership, Rachel is focused on the transformation of trauma into action and leadership. Her practice includes a variety of modalities integrating body, breath, meditation, and creative arts-based practices.

Rachel holds a B.A. in Transformative Education & Leadership and a M.A. in Clinical Mental Health and Mindful-Trauma Informed Leadership. Rachel is currently working on her PhD in Integral/Transpersonal Psychology.