Welcome to Synthesis

Synthesis is a safe, legal, and modern psychedelic retreat utilizing psilocybin truffles for creative breakthroughs, personal growth, and spiritual development. Click below to join us on our next retreat!

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Personal & Professional Breakthroughs

Steve Jobs called it one of the most profound experiences of his life.

Tim Ferriss, best-selling author and tech entrepreneur, has said that all the billionaires he knows, with few exceptions, take this journey on a regular basis.

And Plato formed his foundational beliefs by utilizing the psychedelic experience, thus setting the groundwork for all of Western philosophy. 

Why does this matter for you? Well, we’ve created a retreat around this very experience - one of the most meaningful, profound experiences an individual can have - and made it available to you at our retreat center just outside of Amsterdam.

At Synthesis we facilitate personal transformation retreats for forward-thinking individuals who want to utilize psychedelics within a modern, legal, and medically supervised context. 

When used within a structured framework, psychedelics are one of the only modalities that creates dramatic, impactful change within just hours of utilization.



How We Do It

First off, we administer the truffles in a unique way to eliminate physical discomfort and nausea. Then, taking into consideration your intention, sensitivity, and previous experience, we optimize the best dosage for you. Finally, we integrate the latest findings and best practices from the psychedelic research community to ensure your experience is as profound and effective as possible.

Nothing like Synthesis has been offered before. In short, we’re making the ‘secret sauce’’ of thousands of self-actualized individuals - one that’s remained underground due to cultural stigma - available to you.

In committing to this experience, you will be a pioneer in your own right, joining a specially curated list of attendees who are contributing to the next conscious evolution of humanity in a significant way.

Are you ready to join us on this journey?



The Synthesis Experience

By joining our retreat, you will:

  • Have a legally sanctioned, professionally guided, optimally comfortable, moderate-to-high-dose psilocybin experience in a beautiful, modern setting

  • Catalyze breakthroughs in your self-understanding to live a more meaningful, purpose-driven life

  • Further develop your educational framework on the use of psychedelic substances, empowering you to use these transformational tools in a responsible, intentional manner

  • Connect with other successful, motivated individuals who have a deep, vested interest in the emerging topic of psychedelic use

  • Contribute to nascent psychedelic research, helping to pave the future path for best practices in retreat settings

But Synthesis isn't just about the experience. It is also about the transformation that will be with you for the rest of your life.

One of the most important aspects of any meaningful psychedelic experience is the integration process. You will learn how to integrate your profound insights through our “Microdosing & Integration” workshop.

Then, once you go back home, you will receive lifetime access to the SYNTHESIS ‘Inner Circle’ as part of your retreat commitment. This will be an ever-evolving group that will provide professional support and networking as you continue the process of your own personal development in utilizing psychedelics to grow and mature.  

We believe our SYNTHESIS ‘Inner Circle’ is the most valuable aspect of committing to this retreat. You will meet and deeply connect with other ambitious, talented, and inspiring participants who will become valuable contacts in your professional pursuits. You will also get access to all other alumni of SYNTHESIS.


It was very intense while I was going through it. I felt very emotional and compassionate for my loved ones as I thought of them I cried for each loved one and loved them all the more. I really appreciated the retreat it was beautiful and spiritual. I felt like I let out so much emotion and now I can take stress easier because I have more room for it. I also still feel the beautiful compassionate love that I experienced and spend more time thinking about how my interactions affect others. I thought the team were also very good and sincere and I would like to thank them again.


Your Experience at Synthesis

We are offering an exclusive 3-day retreat in Amsterdam for individuals who want to utilize moderate-to-high doses of psilocybin truffles to catalyze creative breakthroughs, deepen self-understanding, and feel ready to make their next big ‘leap’ in life.

This is the first legal opportunity to take psychedelics in a safe, intentional and expert-guided setting to facilitate productive outcomes like heightened creativity, clarity on next steps in your life, and general personal development.

During the experience, we will control for the following six conditions that play an essential role in every psychedelic experience:

  • Set: the mental attitude of a would-be psychedelic voyager

  • Setting: the surroundings in which a psychedelic substance is ingested

  • Guide: a person experienced with non-ordinary states of consciousness who helps to mitigate challenges and channel insights

  • Substance: the type and quantity of psychedelic agent

  • Session: the entirety of a psychedelic trip, including all activities and rituals

  • Situation: the environment, people, and culture from which a person comes to a session and returns afterward

When these vectors are not controlled, and psychedelics are not done in a safe, supportive, and structured setting, many of the benefits will not be experienced. That’s why we pay such close attention to the environment we create for your experience. We understand working with psychedelics can be intimidating, at times, and we believe by curating an excellent space, much of the potential concern is mitigated.

Further, because of the power of psychedelics, and the strong influence of others on your experience, we limit each workshop to 12-16 carefully selected participants. This retreat is not open to everyone, and an application process for the 3-day retreat is mandatory for each individual.


Three Focal Points of Synthesis

The 3-day retreat will be held with experienced facilitators in a safe, structured, and legal format. The psychedelic we use, psilocybin-containing truffles, are legal and socially accepted in the Netherlands. For ease of mind, medical assistance will on site during your psychedelic session. 

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1-on-1 conversations with your lead facilitators to help clarify intentions and calibrate your dose level. We also discuss whether you want to optimize your experience for creativity on a professional level, personal development, or for having a mystical experience.

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Consuming the psilocybin truffles at either a low, moderate, or high dose, fully prepared and in a perfectly optimized setting with eye mask, moving music to explore both your inner and outer world. 

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Our 'Microdosing and Integration' workshop, which provides guidance and understanding on how to integrate your experience, so you can bring your newfound insights back with you and make concrete, meaningful changes in your everyday life. 


Thank you again for organising such an amazing event and making it so rewarding for me and the other participants.

You guys made this possible... by your energy and compassion, by your intelligence, experience and humour... and by how you brought the group together skillfully and created an environment that helped everyone open up to one another.

It was quite special to feel so connected with a group of people in just a couple of short days. Everyone in the group really appreciated the opportunity to talk about psychedelics and bio-hacking with kindred spirits who share this unique and special interest.
I feel that I made one of the best decisions of my life by deciding to attend the Synthesis retreat. My life has improved on numerous fronts and I have adopted new practices (e.g., daily meditation and free-flow writing) to sustain my new outlook on life.

I have learned that my ego, itself, is not a bad thing and that I need to have the same compassion for it that I have for other people. I have also learned to live in the present moment and embrace life as it comes to me.

In addition to gaining profound clarity on the self-betterment intentions I brought with me to the retreat, the bonds and relationships that I built with everyone else there were some of the strongest I have ever felt – an unexpected dividend of this experience.
— Jon, 27, USA

Your 3-Day Synthesis Retreat includes



  • Journaling tools to cultivate your intention before the workshop

  • Recommended education materials

  • General education on self-care modalities, like meditation

  • Online video call with your lead facilitators and the participants in your retreat



Day 1

12:00 - Arrival - Transfer from Amsterdam
13:00 - Opening circle
14:00 - Welcome lunch
15:00 - Flight instructions
16:00 - 1-on-1 conversations
19:00 - Dinner
20:00 - Conversation time, Q&A



Day 2

08:00 - Breakfast
09:30 - Breathwork/Yoga/Meditation
12:00 - Psilocybin ceremony
21:00 - Dinner
22:00 - Conversation time



Day 3

08:00 - Breakfast
09:00 - 1-on-1 conversations
12:00 - Integration workshop
14:00 - Closing lunch
15:00 - Free time



Watch this four minute video to understand the impact of Synthesis on previous attendees



Upcoming Retreats


JANUARY 8th-10th

9 spots left


January 18th-20th

5 spots left

January 25th-27th

6 spots left

February 8th-10th

10 spots left

February 15th-17th

9 spots left


February 22nd-24th

12-16 spots left

March 1st-3rd

12-16 spots left

March 8th-10th

9 spots left

March 15th-17th

12-16 spots left


March 29th-31th

10 spots left



The Synthesis Team


Your Facilitators:

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Natasja Pelgrom

Lead Facilitator

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Tessa Van de Ven

Lead Facilitator

Daan Keiman

Daan Keiman



Managing Team:

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Paul Austin

Co-Founder & Director of Business Development

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Martijn Schirp

Co-Founder & EXECUTIVE Director

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Myles Katz

Director of Operations & Finance

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Kristyn Judkins

General Counsel

Is Synthesis Right For You?

Synthesis is great for you if:

  • You want to connect with ‘like-minded’ individuals and start to build a community around you of people interested in the modern, responsible use of psychedelics.

  • You’ve been stuck on a major professional or personal problem for an extended period of time and are looking for creative inspiration.

  • You want to explore the outer reaches of your consciousness, unlocking aspects of your mind that have yet to be accessed.

  • You’re curious about the utility of psychedelics and want to do them in a safe, legal, and structured setting.

  • You feel like there’s a psychological blockage preventing you from reaching that ‘next stage’ in your professional or personal development.

  • You want to reset your default mode network.

  • You’re open to the potential value of psychedelics but haven’t found the right time and place yet.

  • You’re intent on being your ‘best self’ and you want to learn how to utilize psychedelics to accelerate the process of personal development.

Synthesis is not for you if:

  • You have a clinical diagnosis of depression, bipolar, borderline, PTSD, or schizophrenia.

  • You have a family history of schizophrenia or psychosis.

  • Currently prescribed to anti-depressant medications (please contact us if you want to be notified when medical spots open up).

  • You are just looking to get high and have fun.

Full Disclosure:

Despite the exciting potential for the clinical use of psychedelics, Synthesis is not a retreat for people looking to experience psychedelics to treat a specific clinical condition. By going through the application process, you accept that we can not accept individuals on prescription medication for mental disorders, there is no clinical motivation for your participation, and that Synthesis Retreat will not be held accountable for any issues that arise from your Synthesis Experience.


+ Who will facilitate the sessions and what are their qualifications?

Please refer to the about page for information on facilitators and their qualifications. Please feel free to contact us if you have any further questions.

+ How will the psychedelic sessions be set up?

We provide a comfortable indoor space with mattresses to lay down on, eye shades, and profound music. In creating an optimal environment for your psychedelic experience, we combine ceremonial aspects rooted in age-old tradition with modern approaches that have proven, in scientific research, to be effective at facilitating a deep, meaningful experience.

+ Why should I invest in this experience if I can take mushrooms at home?

We believe the context of a group retreat and having experienced guides are essential ingredients to properly optimize for safety and getting the most out of a psychedelic experience. From years of retreat experience we know the value of this experience is rooted in the relationships you will build.

+ Can I do more than one retreat?

Yes, you can. In fact, we recommend doing more than one ceremony, whether that is over the course of a week or multiple months. Most research indicate that while a single ceremony is highly effective, the changes are more profound and durable with three or more psychedelic ceremonies. Please indicate in your application form if you're interested in doing a series of retreats.

+ Is there any prep or post work included with the retreats?

Prior to the 3-day retreat, you will have a 1-2 hour group video call with your facilitators to discuss the retreat. More preparation documents will be sent over nearing your retreat date. During the retreat, you will have two 30-minute private conversations to discuss anything that might come up. We will always be available for any assistance post-retreat.

+ Are psilocybin truffles safe?

According to recent studies, psilocybin mushrooms (which have the same active ingredient as truffles) are the safest drug currently available - safer than tobacco, cannabis, and alcohol. These substances are non-addictive, non-toxic, and, when taken within a structured setting, have little to no risk.

+ Where can I learn more about psilocybin truffles?

To get more information about psilocybin truffles, please read through this Essential Guide on Psilocybin Mushrooms.

Here is a brief overview of the legal status of psilocybin truffles in the Netherlands.

+ What are the long term risks associated with psilocybin truffles?

As long as you do not have a pre-disposition to psychosis or schizophrenia, and are currently not prescribed any there are little to no long-term risks associated with psilocybin truffles.

+ Will my personal information be confidential?

We keep all personal information confidential, none of it will be shared with third parties.

+ I’m excited about this opportunity but nervous about trying psychedelics for the first time. Do you have further resources I can check out?

The best beginning resource is The Third Wave, a website dedicated to psychedelic literacy and education.

+ Can I opt out for the research?

Yes, you may opt out at any time, participating with our research is not mandatory. Part of these retreats is to discover the potential of psychedelics on human development and to improve the integration of these substances in your life. If you do choose to participate, all of your data will be held strictly anonymous.

+ Do you offer 1-to-1 guided sessions if I prefer to do this in private?

Yes, we do! Please use the application form or reach out to us through our contact form to get more information on a private psilocybin experience with one of our experienced guides. We also offer 1-to-1 preparation and integration coaching for an additional fee. If you're interested in working with us in this capacity, please indicate this in your application form.


Next Steps

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1. Fill out the application

Please fill out the following form. Be as truthful and precise as possible. We will follow up on all answers and any questions you might have during our preparation call. 

Fill out my application now

Not ready to apply yet? Reach out to us through our contact form with any questions you have.

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2. Pay your application fee

We kindly ask all potential participants to pay a non-refundable fee of €50 before we consider your application.

We will contact you shortly after to set up a mandatory call. For safety reasons, your spot is only reserved after this call.

If you have any further questions, please contact us.

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3. Fly to Amsterdam

Once the event draws nearer, we will send you all the practical information you need. We will also ask you to dive deep in a few exercises to optimally prepare your mind and body for this event.

We recommend to arrive in Amsterdam the day before the start of your retreat to allow ample time to rest and adjust. 

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