About The Synthesis Institute

Mission & Vision

Synthesis is committed to safely, legally, and effectively stewarding psychedelics into modern culture through our use of psilocybin mushrooms (or truffles containing psilocybin in the Netherlands). In our professionally curated settings, this remarkable organism can be an agent of life-enhancing experiences.



Using our integrative approach to transformative wellness, we combine leading-edge research with ancient wisdom traditions, rituals, and spiritual practices to curate a potent container that has the potential to catalyze change.



Led by professional facilitators, Immersion Retreat integrates psychedelic education, workshops, open-dialogue, breathwork meditation, sound, psychedelic ceremonies, and integration with the aim of restructuring disempowering thoughts.

Venue & Amenities

A/C in Rooms icon A/C in Rooms
Free Wifi icon Free Wifi
Spa icon Spa
Sauna icon Sauna
Pool icon Pool
Towels icon Towels
Free Parking icon Free Parking
Kitchen icon Kitchen
Tour Assistance icon Tour Assistance
Hot Tub icon Hot Tub
Coffee/Tea icon Coffee/Tea
Cafe icon Cafe
Restaurant icon Restaurant
Fitness Center icon Fitness Center
Yoga Studio icon Yoga Studio
Housekeeping icon Housekeeping
Bicycles For Rent icon Bicycles For Rent
HOLOS is a private retreat and residency space located in the lush Diamante Valley of southwest Costa Rica. This sacred space is lovingly stewarded with deep care and integrity, offering a community-centered environment dedicated to helping individuals find wholeness through connection with nature, intentional living, and a focus on embodied, evolutionary wellbeing.

Meals

Menu
Menu

Menu Types

We provide tasty vegetarian and organic dishes. You will have the chance to savor a diverse menu with various options. Gluten-free choices are available, and we can accommodate your allergies as well.

Getting Here

Location icon The Synthesis Institute, Hemrik, the Netherlands

Directions

You can reach the Retreat Center easily by taking a train from any part of the country to Heerenveen, and then taking a taxi to New Eden. Alternatively, you can also use taxi services such as Uber, Bolt, and private taxi companies that operate in the country.

Customer Reviews

5.00 out of 5.0 average rating

5.0
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Transformative, Healing, and Professionally Inspiring
My week at Synthesis was a profound journey of healing, learning, and self-discovery. The retreat was beautifully organized, with incredible attention to detail and care for every participant. I came with both personal and professional intentions, and left with both fulfilled.

The ceremonies were intense, transformative, and deeply healing. I experienced somatic release, emotional clarity, and energetic realignment, supported by facilitators who held space with kindness, skill, and deep presence. The blend of indigenous ritual, music, and ceremony with modern methods was inspiring, offering a bridge between tradition and contemporary practice.

Beyond the medicine, I gained invaluable insight into holding space as a practitioner, witnessing how empathy, structure, and attentiveness can support profound transformation. I left with new clarity, gratitude, and important questions about my life, my legacy, and how to live more fully in love and service.

Synthesis is a space of deep care, professional excellence, and transformative experiences. I wholeheartedly recommend it to anyone seeking personal growth, healing, or professional training in the art of holding psychedelic space.

5.0
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Immersion retreat in the Netherlands
This was a transformative retreat. All components of the place, people, activities and experiences made it a once in a lifetime event. I was able to look at things from different angles, to slow life and meet myself and other as new delicate details were able to unfold. The process enabled me to go deep, to face fear and to feel I was held safely and then heal

5.0
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Receiving the space to come into my fullness
Synthesis Immersion retreat was nothing but exceptional. The attention to detail and scheduling gave enough structure and freedom to move freely with the insights that were offered through the multiple ceremonies. Each facilitator brought such a unique strength and presence to the space and everything was orchestrated in perfect harmony. Having music be the main guiding force during the ceremonies was breathtaking and it provided so much wealth and allowance to navigate the energies moving throughout not only the ceremony room but throughout the New Eden space and through each participant and facilitator. I went into this experience with no expectations and with the intention to learn more about how to be more of service moving forward and I received so much teaching, guidance and support by everyone involved. What a state of the art experience and I will truly cherish it for forever.

5.0
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It can't get better than this
I spent a week at a psychedelic retreat in Costa Rica, and it was pure paradise. Every day we swam in clear waterfalls and walked through lush green jungle. The food was fresh and delicious, and the staff treated us with real care and respect. The guides were skilled and kind, making every ceremony feel safe and meaningful. Most of all, the other guests felt like instant friends. Beautiful nature, great people, tasty meals—this retreat gave me healing and happiness. It really couldn’t have been better.

5.0
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Five Stars: well supported
The surrounding jungle, wildlife and waterfalls were powerful support for me throughout the week. Our facilitators were mindful, gifted with wisdom and music so personal that the experience felt orchestrated for my best interest. I experienced an intentional layering of preparation that felt like being surrounded by goodness. The food was outstanding. The accommodations a bit rustic but clean and very close to nature. I hope I can return to this space in my mind for the rest of my life.

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