The Synthesis Institute: 19+ Reviews, Prices, Photos & 2025 Schedule

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. Read More

Upcoming Retreats at The Synthesis Institute

Plant Medicine

Immersion: Synthesis’ 5-Day Legal Psilocybin Retreat in the Netherlands

Cameron's Staff Pick

August 16 - 20, 2025

The Synthesis Institute Hemrik, Netherlands

$5,797 / 5 days

5.00

Plant Medicine

Immersion: Synthesis’ 5-Day Legal Psilocybin Retreat in the Netherlands

Cameron's Staff Pick

October 7 - 11, 2025

The Synthesis Institute Hemrik, Netherlands

$5,797 / 5 days

5.00

Plant Medicine

Immersion: Synthesis’ 5-Day Legal Psilocybin Retreat in the Netherlands

Cameron's Staff Pick

August 16 - 20, 2025

The Synthesis Institute Hemrik, Netherlands

$5,797 / 5 days

5.00

Plant Medicine

Immersion: Synthesis’ 5-Day Legal Psilocybin Retreat in the Netherlands

Cameron's Staff Pick

October 7 - 11, 2025

The Synthesis Institute Hemrik, Netherlands

$5,797 / 5 days

5.00

Plant Medicine

Immersion: Synthesis’ 5-Day Legal Psilocybin Retreat in the Netherlands

Cameron's Staff Pick

August 16 - 20, 2025

The Synthesis Institute Hemrik, Netherlands

$5,797 / 5 days

5.00

Plant Medicine

Immersion: Synthesis’ 5-Day Legal Psilocybin Retreat in the Netherlands

Cameron's Staff Pick

October 7 - 11, 2025

The Synthesis Institute Hemrik, Netherlands

$5,797 / 5 days

5.00

Plant Medicine

Immersion: Synthesis’ 5-Day Legal Psilocybin Retreat in the Netherlands

Cameron's Staff Pick

August 16 - 20, 2025

The Synthesis Institute Hemrik, Netherlands

$5,797 / 5 days

5.00

Plant Medicine

Immersion: Synthesis’ 5-Day Legal Psilocybin Retreat in the Netherlands

Cameron's Staff Pick

October 7 - 11, 2025

The Synthesis Institute Hemrik, Netherlands

$5,797 / 5 days

5.00

Your Guides

Venue & Amenities

A/C in Rooms

Free Wifi

Spa

Sauna

Pool

Towels

Free Parking

Kitchen

Tour Assistance

Hot Tub

Coffee/Tea

Cafe

Restaurant

Fitness Center

Yoga Studio

Housekeeping

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. Read More

Meals

Menu Types

Vegan

Vegetarian

Pescetarian

Ayurvedic

Includes Meat

Organic

Gluten Free

Dairy Free

Nut Free

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. Read More

Getting Here

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. Read More

Customer Reviews

5.00 out of 5.0 average rating

JeanCharles • Jun 06, 2025

5.0

Verified

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. Read More

Liz • May 05, 2025

5.0

Verified

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. Read More

Mitchell • Apr 14, 2025

5.0

Verified

'Exceptional' does not adequately describe my experience

From my first interaction over Zoom, Synthesis gave me much more than I ever expected.

This is a 6-week retreat. The Integrative Zoom sessions before and after the 5-day in-person experience are important and powerful. I did not expect that this entire retreat was so deeply inclined towards meditation and a spiritual journey. There was much power and transformation that occurred even outside the 2 'Ceremonies'.

As well, the facilitators gave care and respect for my personal journey. Helping me, but always allowing me to find my own path. If you are undecided if the Medicine is right for you, I very much recommend that you reach out and have a discussion with Synthesis.

Come with an open mind and leave with an expanded Heart :) Read More

Patricia • Dec 19, 2024

5.0

Verified

Immersion Apprenticeship Retreat

This summer, I had the privilege of attending the immersion retreat from Synthesis in the Netherlands as an apprentice. It was a profoundly beautiful and insightful experience that provided invaluable lessons for my future practice as a psychedelic practitioner. The facilitators were experienced and very kind, creating a safe and supportive environment throughout the retreat. The food was also outstanding. I wholeheartedly recommend this immersion retreat. Read More

Daniel • Dec 18, 2024

5.0

Verified

Amazing experience, people and team!

As a complete novice to entheogens/psychedelics it was amazing to see how the retreat catered to those of all levels, helping a rookie like me feel very safe & secure while still keeping those with more experience really engaged! They do a great job of curating groups of awesome people, while our group was very diverse there was no drama or issues. Read More

The Synthesis Institute

Have a question for your host?

About The Synthesis Institute

Mission & Vision

Upcoming Retreats at The Synthesis Institute

Your Guides

Venue & Amenities

Meals

Menu Types

Getting Here

Directions

It can't get better than this

Five Stars: well supported

'Exceptional' does not adequately describe my experience

Immersion Apprenticeship Retreat

Amazing experience, people and team!

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