Psychedelic Workshop February 10 2023 - 15:00 CET
Psychedelic retreat program


This three-step psychedelic retreat program offers a natural way to refresh your mind and reconnect with your body. You’ll discover how to transform old habits and patterns into more beneficial thoughts and behavior. You’ll learn how to create more calm, clarity and creativity in your life. Our expert guides are with you all along the way.


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This program is more than a psychedelic retreat. You’ll be guided by our experts from intake to integration. We offer a comprehensive learning program leading up to a profound psychedelic experience with safe and legal truffles containing natural psilocybin. You will be supported by meditative practices and immersive live music.

stEP 1:

Your preparation starts with our psychedelic Masterclass in the Spinoza app. This is followed by a two-hour online preparation workshop where you meet your guides and your curated group of participants. You’ll learn how psychedelics work on a physiological level and we explore a number of meditation and breathwork practices. You’ll have all the knowledge and practical skills to confidently start your psychedelic journey.

Preparing for psychedelic experience

Step 2:

The pinnacle of the program is a beautiful psychedelic ceremony with immersive live music in our cozy yurt. This takes place during a one-day and one-night retreat in the midst of a lush forest. Based on your preferences and intention, you’ll receive a moderate to high dose of truffles containing natural psilocybin, allowing you to access deeper levels of consciousness. We take care of every detail, so you can comfortably turn your attention inward.

A cup of warm psychedelic truffle tea

SteP 3:

Integrating a psychedelic experience requires attention and inquiry. During a two-hour online integration workshop, we will explore and reflect on the insights and challenges you may have encountered during your psychedelic journey. You’ll receive expert guidance and loving support to process your insights and evaluate their meaning. The Spinoza app gives you all the practical tools to integrate them into your daily life.

WHat CAnyou EXPect?

  • The Spinoza app provides access to our educational platform, which includes a comprehensive psychedelic Masterclass, a library of meditation techniques and breathwork practices – both in audio and video – and mesmerizing, four-hour Music Journeys – specifically composed to follow the flow of a psychedelic experience.

  • Before we start your process of personal growth, we’d love to get to know you a bit and speak about your intentions and needs. We’ll gladly answer any questions you may have. Please don’t be shy to fill out the contact form, so we can get in touch with you. Speak soon!

  • Our ceremonies are led by experienced guides, specialists and experts, including therapists, who solely act in service of your well-being and who are there to care for your every need before, during, and after the ceremony. We facilitate a safe space where anything can be processed that needs to arise.

  • With everyone who shows interest in our ceremonies, we always aim to create a balanced group of like-minded people with a maximum of 10 participants.

  • Preparation is essential in order to make your journey most beneficial for you. In this two-hour online preparation workshop, you’ll meet your guides and your curated group of participants. You’ll learn how psychedelics work on a physiological level and we explore a number of meditation and breathwork practices. You’ll have all the knowledge and practical skills to confidently start your psychedelic journey.

  • Your psychedelic ceremony takes place in the midst of the beautiful woods of Maarn. This is where you’ll meet your guides and other participants in real life. Together, we’ll go for a good walk in the forest and practice breathwork and meditation and some light body movement, before going into the yurt for the ceremony. You’ll be immersed in wonderful live music. All meals, bites and drinks are included.

  • This ceremony is designed as a deep dive, which means we generally offer a dose of 21 grams of fresh truffles or more. However, dosing is highly personal and we consult with each person individually to determine which dose suits your intention best. The ceremony is complemented by meditative and breathwork practices before and after in order to provide solid ground for your process to unfold. You’ll be immersed in wonderful live music.

  • During the preparation workshop, we share some dietary suggestions prior to the ceremony. This includes (at least a relatively short period) of fasting. After the ceremony, we make sure that we enjoy a delicious, vegan, nourishing, warm meal together. More food for the soul 😉 All meals and drinks are included.

  • Your process of growth doesn’t end with a psychedelic ceremony. Integrating a psychedelic experience requires attention and inquiry. During this two-hour online integration workshop, we will explore and reflect on the insights and challenges you may have encountered during your psychedelic journey. You’ll receive expert guidance and loving support to process your insights and evaluate their meaning.

  • This psychedelic retreat will prove its worth over the course of a lifetime. As this program is aimed at personal growth, many participants allocate it to personal development programs. When you are a business owner, leadership and personal development programs are often deductible. Please request an invoice with us for €990,- excluding VAT.

€1198,- incl. VAT


Mentor & Teacher

jannEKE KRIJGsman

Janneke loves guiding people to reconnect to their most authentic selves. She has been teaching meditation, yoga and breathwork for over a decade, while also exploring the fields of plant medicine.

Over the past five years, she has focused her attention on guiding personal growth processes, assisting people to find more clarity in the various challenges life confronts us with. Continuously surprised and inspired by her own inner journey, Janneke naturally invites people to discover their inner world, with all its depth and beauty.

Janneke has been with Spinoza from day one and has been essential in creating the Spinoza programs. She brings her equally peaceful and powerful presence as well as her beautiful voice and soulful music to each Ceremony.

Janneke loves having deep, explorative conversations, early morning dips in the sea, and sharing homemade food with her loved ones. She lives in The Hague and is a dedicated mother to her son Maas and daughter Ief.

Mentor & Founder


Maarten has been teaching meditation and assisting people to make the journey inward for nearly fifteen years. With silence, music, plants and fungi he guides people toward their own natural wisdom.

Maarten has co-founded Delight Yoga and a number of other initiatives aimed at inspiring a more natural and conscious way of living. Spinoza forms the pinnacle of a personal journey with plant medicine which started in 1999 and has grown into an intelligent network of therapists and scientists united in the mission to experience and experiment with the health potential of natural medicine and nature therapy.

Maarten is a proud father to Philip, Alexander and Victoria, and dedicated husband to Anna.



Marjolein has a background in conscious leadership and coaching in both personal and professional settings. Her experience in leadership and executive coaching combined with her warm, compassionate and empathetic approach has helped many people to find their purpose and essence in life.

In recent years, she has rekindled her love and passion for music. Marjolein loves to use the healing power of frequency, melody and her voice to guide people through profound processes.

At Spinoza, she’s able to empower people by combining many of her personal interests; from spirituality to plant medicine, her own life experience and her love for music. Marjolein is a proud mother of Beer and is happily together with Edo.


Let's talk

booK a CaLL

We understand you may have many questions, which we’ll gladly answer.
An exploration call is free and without any further obligation.
We’d be happy to speak with you.

Please also take a look at our FAQ below

FrequENTLY ASKED questioNS

  • A psychedelic experience allows you to gently and calmly open up to thoughts and feelings that you may avoid in everyday life. You may feel a deeper connection with yourself, allowing you to address a wide range of issues. Psychedelics improve the brain’s neuroplasticity, which can be helpful in breaking thought patterns and replacing old habits with more beneficial behavior. Psychedelic journeying is most beneficial when supported by our preparation and integration workshops and the daily practices we offer in our app.

  • Psychedelic plants and fungi have been used in indigenous medicinal traditions for thousands of years. The scientific world has studied the benefits of psychedelic truffles since the 1950s and has repeatedly reported positive effects on behavior, cognition, spirituality and consciousness. As scientific research continues, promising results are made in neuroscience, mood and mental disorders, addiction and habit formation.

  • There are two main considerations when taking psychedelics: your physical and mental health and the timing in your life. If you are receiving treatment or taking medication, please consult your doctor. As for timing, trust your intuition. Do you have enough time and space in your life? Are you in a balanced and open state of mind? The tools we offer, like our Psychedelic Masterclass, are designed to help you create the optimal conditions for mind and body.

  • Your experience and the duration of its benefits are likely to improve when you’re well-prepared. Our Psychedelic Masterclass offers a variety of practices to create the right mindset and environment for a meaningful, insightful and safe journey. We will give you detailed practical information on dietary recommendations and help you find peace of mind through meditative practices and breathwork in the Preparation workshop and before we start the ceremony. 

  • Psilocybin is completely safe when used responsibly in a safe environment with people you know and trust. It is a naturally occurring substance that is converted by the body into psilocin, which acts on the serotonin receptors in the brain. Psilocybin is not addictive and there are no known reports of overdoses. We do advise you to conduct your own research as well and to consult various sources of information. 

  • Fresh truffles containing natural psilocybin are legal to buy and consume in the Netherlands. This is not the case in most parts of the world yet, but more and more countries currently have legislation under consideration to make psychedelic therapy more widely available.

  • In our ceremonies, we offer legal truffles containing natural psilocybin. This induces a psychedelic experience of approximately 4-6 hours. We generally offer a high dose of 21 grams of fresh truffles or more. Dosages are determined in consultation with each individual participant and based on your experience, intention, and physical and mental condition.

  • Our Sclerotia Psilocybe are 100% natural, unprocessed and free of additives. Do not consume if you are under 25 years of age, pregnant or breastfeeding. Do not take in combination with alcohol, drugs or medication or while driving. Please consult your doctor beforehand if you have a mental and/or medical condition. Read more in our protocol.

  • Do not consume psilocybin when you take medication. Always consult a doctor before you take any further steps. If you have any specific questions, we can also consult our medical expert to help you gain clarity.

  • (PLEASE CONSULT A DOCTOR WHEN IN DOUBT) There are a few important contra-indications, such as if you are suffering from heart problems, if you are currently dealing with mental issues, or when you are pregnant.

    Please make sure that you carefully check the following contra-indications:

    – You have no current physical or mental health disorder;

    – You have no history of psychosis or close relative with a schizophrenic disorder;

    – You do not currently take any medication;

    – You are not currently pregnant or breastfeeding.

OUr MEthod

We believe that the positive effects of psychedelics can be enhanced and prolonged by embedding them in nature and supporting them with meditation practices and musical experiences.

Nature offers an infinite source of inspiration, insight and loving connection. By making a conscious effort to reconnect with nature, we can tap into its healing energy.

Ask your local forester what it is that keeps trees healthy and happy, and he or she will answer ‘mycelium’; fungi. In our case, these are truffles containing natural psilocybin.

Meditation helps to create calm and clarity in the mind. It’s a tool to be aware of the here and now, to face our fears and to accept what needs to be accepted.

Learn how to use your breath to get acquainted with altered states of consciousness. It will also help you shift your attention from your mind to your body.

Music plays an essential part in the way you experience a psychedelic journey. Our signature music is engineered to release various emotions, allowing them to be processed on a deeper level.

You can count on having a solid and loving community to support you during your transformative process. Our community regularly gets together to share experiences.

GROund for GRowth

Our psychedelic retreat program provides solid ground for personal growth. It can shed light on aspects of your life or personality that may need more attention. You’ll also be able to shift your awareness from your head to your heart – from rational to intuitive decision-making.

  • Access deeper layers of consciousness to determine what is essential to you.

  • A psychedelic experience can help you to go beyond the individual self and get a sense of something much greater that we are a part of.

  • Recreational use can be fun, intentional use can help you bring real change into your life.

  • Move beyond your conditioned mind and connect to a deeper intuitive intelligence.

  • Experience the power of the shift of perspective that a psychedelic experience can bring about.


In our ceremonies, we offer legal truffles containing natural psilocybin. This induces a psychedelic experience of approximately 4-6 hours.

Dosages are determined in consultation with each individual participant and based on your experience, intention and current physical and mental condition.

After ingestion, Psilocybin is metabolised by our bodies into Psilocin, which is responsible for inducing the psychedelic state. Its molecular structure fits precisely into one specific serotonin receptor (5HT2A).

What is serotonin?
Serotonin, like dopamine, is a neurotransmitter. It’s sometimes referred to as the “happiness” or “feel good” molecule. It practically controls all human behavioural processes and plays a dominant role in the Central Nervous System.

What is neuroplasticity?
Thoughts and habits create neurological pathways in the brain. When we repeat a particular habit or thought, this pathway gets ingrained in the mind. The longer, the deeper, sometimes even to the point that we think there’s no other option.

Neuroplasticity is the ability of the brain to form new connections. New connections can mean new insights, ideas and perspectives on an existing problem or observation.

A psychedelic experience can create a window of time where there is an opportunity to rearrange or reroute some of these pathways. This can enable you to replace habits and thought patterns that may no longer be beneficial to you.

WE ARE Here to guIDE YOU

Whether you have no experience at all and want to familiarize yourself with psychedelics in a safe and responsible way, or if you are looking for more profound and meaningful experiences, you are welcome with us. We offer a highly personalized approach, from preparation to integration. We’re here to guide you all along the way.

PHAses OF APSYchedeLIC jourNEY

no PRIor EXPErienCEwith PSYCHEdelICSREQuired

COnnect TO YOUr own WISdom

WAnT to ReaD morE?

Dive into a selection of our articles that give some more in-depth information on
the subject of psychedelics – specifically psychedelic truffles containing natural psilocybin.
Get more background information, a bit of history, some recent scientific findings, and
about applying them with care and intention.

Spinoza Journal