Francisca Niklitschek
Contributing Authors
Dmitrij Achelrod PhD
Francisca Niklitschek
Legal psilocybin-truffle retreats in the Netherlands are offered by at least six providers operating at meaningful scale: Beckley Retreats, Synthesis Institute, Kiyumi, Acsauhaya, Spinoza and Evolute Institute.
They vary widely on facilitator-to participant ratio (1:2 to 1:4), medical screening, and program length (one night to twelve months). This page compares them against a published evaluation framework, not against each other’s marketing claims.
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Don’t see the provider you’re looking for? If your chosen center isn’t on this list, click here to check our secondary blog where we compare more providers across Europe.
About this Comparison
The criteria below come from the Psilocybin Retreat Evaluation Framework, co-authored by Evolute and published under CC BY 4.0 – open to revision by any researcher, health professional, retreat provider, journalist, or policymaker on GitHub. Each standard is evidence-graded (Direct, Transferred, or Operational), and we flag where the evidence is still developing rather than presenting every line item as equally proven.
Beckley, Evolute Institute or Spinoza? Top Psilocybin Retreats 2026 – Comparison Table (Netherlands Focus)
Several well-known psilocybin retreat providers operate in the Netherlands and beyond, including Beckley Retreats, Synthesis Institute, Kiyumi, Acsauhaya, Spinoza, and Evolute Institute. While they all share the goal of facilitating meaningful inner experiences, their approaches, structures, and levels of support vary considerably.
- Beckley Retreats – it runs programs in Jamaica and the Netherlands. They are known for their science-backed framework and luxurious setting.
- Synthesis Institute – one of the largest and most renowned psychedelic retreat providers but they went bankrupt at the beginning of 2023. Now they offer a seven-week journey that includes a five-day retreat in the Netherlands.
- Kiyumi provides six-day retreats in the Netherlands. Their model focuses on trauma-informed work, hosting around 16 participants and the curriculum is limited to the retreat duration.
- Acsauhaya organizes retreats in the Netherlands and Costa Rica. They also offer ayahuasca ceremonies in the Netherlands, although this remains legally unclear.
- Spinoza runs one-night psilocybin retreats in the Netherlands, focusing on short, design-oriented experiences. Their format includes one ceremony without specified group size, medical supervision, or integration support.
- Evolute Institute stands out for its 3-month (and up to 12-month) hybrid program that combines extensive preparation, a four-day psilocybin retreat, and a structured integration phase. The retreat takes place in the Netherlands with a 1:2 participant-to-facilitator ratio and a medical doctor present during the ceremony. Each participant receives four one-on-one sessions as part of the overall process, supported by a science-backed and psychologically grounded curriculum that integrates neuroscience, mindfulness, and leadership development frameworks.
Here is a comparison of the main variables to consider within the 3 critical categories when choosing the best legal retreat:
1. For Safety Standards:
Use the checklist below to verify the safety standards of any provider:
| Critical Category | Retreat Provider | Evolute Institute | Beckley Retreats | Synthesis Institute | Kiyumi | Acsauhaya | Spinoza |
|---|---|---|---|---|---|---|---|
| Safety | Facilitator-Participant Ratio* | 🟢(1 : 2) | 🟠(1 : 3) | 🟡(~1 : 2/3) | 🔴(1 : 4) | 🟠(1 : 3) | Unspecified |
| Safety | Medical Doctor On-site | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ |
| Safety | Written & Verbal Medical Screening (Psychiatrist) | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Safety | MAPS-certified facilitators | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ |
| Safety | 1-on-1 Prep & Integration | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ |
| Safety | 1-on-1 Sessions (Total) | 4 | 2 | 3 | 3 | 1 | ❌ |
| Safety | Discovery call with founders | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Safety | Explicit ethical guidelines | ✅ | Unspecified | ✅ | ❌ | ❌ | ❌ |
2. For Curriculum Design
Compare the depth and structure of the program using these key variables:
| Critical Category | Retreat Provider | Evolute Institute | Beckley Retreats | Synthesis Institute | Kiyumi | Acsauhaya | Spinoza |
|---|---|---|---|---|---|---|---|
| Curriculum Design | On-Site Retreat Duration | 4 days | 6 days | 5 days | 6 days | 3 day | 1 night |
| Curriculum Design | Curriculum Duration | 3–12 Months* | 6 weeks | 7 weeks | 3 weeks | 8 weeks | pre-recorded content |
| Curriculum Design | Unlimited Check-ins | ✅* | ❌ | ❌ | ❌ | ❌ | ❌ |
| Curriculum Design | Unique curriculum at the intersection of psychedelics, personal growth, and leadership | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ |
| Curriculum Design | Substance (focus) | Truffles | Truffles | Truffles | Truffles | “Dutch Ayahuasca Brew” | Truffles |
| Curriculum Design | Lifelong Alumni Network | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ |
3. For Setting & Container
Ensure the environment creates the right level of intimacy and comfort by checking these elements:
| Critical Category | Retreat Provider | Evolute Institute | Beckley Retreats | Synthesis Institute | Kiyumi | Acsauhaya | Spinoza |
|---|---|---|---|---|---|---|---|
| Setting | Geographic Focus | Netherlands | Jamaica | Netherlands | Netherlands | Costa Rica & Netherlands | Netherlands |
| Setting | Live Integration & Prep Sessions (Total) | 8 | 6 | 6 | 2 | 5 | pre-recorded content |
| Setting | Group Size | 6-10 | 15 | 15-20 | 16 | 10 | 11 |
| Setting | Private Room (en-suite bathroom) | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ |
Final Takeaway
Of the six providers compared here, Evolute is the only one that meets every baseline and strong-practice standard in this framework simultaneously – the comparison table above shows exactly which line items each provider does and doesn’t meet, so that claim is checkable rather than asserted. Evolute has also published its own self-disclosure against this same framework, domain by domain, rather than asking you to take the comparison table’s word for it.
Why These Variables Matter
The criteria below come from the Psilocybin Retreat Evaluation Framework, co-authored by Evolute and published under CC BY 4.0 — open to revision by any researcher, health professional, retreat provider, journalist, or policymaker. Each standard is evidence-graded, and we flag where the evidence is still developing rather than presenting every line item as equally proven.
Safety Standards
Facilitator-to-Participant Ratio
Evidence: OperationalThe widest documented spread among the six providers compared here runs from 1:2 to 1:4. There's no single validated ratio for commercial retreats, but the more qualified facilitators per participant, the more likely someone in distress gets timely attention instead of waiting their turn. A 2026 group-retreat trial ran cohorts of five to eight participants with four core and two backup facilitators, explicitly measuring unattended distress — an informative capacity-planning example, not proof this exact ratio is required everywhere (Back et al., 2026a, 2026b).
Medical Presence
Evidence: TransferredOf the six providers compared here, only two disclose an on-site MD. "On call" means little if no one on-site can recognize deterioration or activate emergency services. No comparative retreat study proves on-site MD presence alone reduces adverse events — it's the more defensible standard for medically complex groups, not a guaranteed outcome.
Medical and Psychiatric Screening
Evidence: TransferredMost providers on this page do not disclose a formal screening process. Screening exists to identify people for whom psilocybin's acute effects make a non-clinical retreat unsafe — medication changes should be directed by the participant's own prescriber, not retreat staff. Lithium co-use specifically is associated with seizures, which is why it should be excluded outright rather than tapered on-site (Nayak et al., 2021).
Trained Facilitators
Evidence: TransferredNo single certificate — MAPS or otherwise — has been validated as a predictor of retreat safety or outcome. The competency literature supports structured training and ongoing supervision, not a single commercial training pathway or badge (Phelps, 2017).
Explicit Ethical Guidelines
Evidence: DirectA published ethics pledge means little on its own — what matters is whether the complaint route is independent of the accused and of commercial leadership.
Curriculum Design
Preparation and Integration Depth
Evidence: TransferredNaturalistic follow-up research finds most people report improvement after psilocybin use, while a minority report persistent negative effects — meaning follow-up needs to be neutral enough for someone to say "I am worse" without being told deterioration is a necessary stage (Nayak et al., 2023).
The Facilitation Model
Evidence: TransferredTerms like "neuroscience-backed" or "leadership curriculum" aren't self-validating — a provider should be able to explain in plain language what each term means and where it refers out to licensed care, rather than relying on vocabulary alone (Carhart-Harris et al., 2018).
Legal and Substance Transparency
Evidence: DirectTruffles and mushrooms carry different legal status and potency profiles, so naming the exact product and its legal basis matters. The Netherlands' legal status for psilocybin truffles is confirmed by the Trimbos Institute — an independent Dutch government source, not a provider's own claim (Trimbos Institute, 2023).
Setting & Community
Group Curation / Admission Process
Evidence: OperationalWho is admitted to a group session, and on what basis, is itself a safety variable — participants affect one another and compete for finite staff attention. A defensible process weighs clinical suitability and whether someone needs more individual care than a group model can provide, rather than accepting anyone who can pay. Group cohesion can add real value, but only when facilitators actively manage group dynamics (Kettner et al., 2021).
Group Size and Private Setting
Evidence: OperationalSmaller groups mean more individual facilitator attention per person. Privacy after the ceremony matters because participants are often unusually open and sensitive to overstimulation in the following days.
Community and Alumni Support
Evidence: AssociationalAn alumni network can reduce isolation and support meaning-making after a retreat, but it can just as easily introduce unqualified peer advice or pressure to adopt a particular worldview. Of the six providers compared here, four report some form of alumni network — the more useful question than whether one exists is whether participation is optional and the space is actually moderated (Kettner et al., 2021).
References
- Back, A.L. et al. (2026a). Group Retreat Psilocybin Therapy for People with Metastatic Cancer with Symptoms of Anxiety and Depression: Safety and Efficacy Outcomes of a Phase 1/2 Study. Psychedelic Medicine. https://doi.org/10.1177/28314425251413856
- Back, A.L. et al. (2026b). Group Retreat Psilocybin Therapy for People with Metastatic Cancer with Anxiety and Depression: A Rite of Passage Facilitation Model for a Phase 1/2 Study. Psychedelic Medicine. https://doi.org/10.1177/28314425251404460
- Carhart-Harris, R.L. et al. (2018). Psychedelics and the essential importance of context. Journal of Psychopharmacology, 32(7), 725–731. https://doi.org/10.1177/0269881118754710
- Kettner, H. et al. (2021). Psychedelic Communitas: Intersubjective Experience During Psychedelic Group Sessions Predicts Enduring Changes in Psychological Wellbeing and Social Connectedness. Frontiers in Pharmacology, 12, 623985. https://doi.org/10.3389/fphar.2021.623985
- Nayak, S.M. et al. (2021). Classic Psychedelic Coadministration with Lithium, but Not Lamotrigine, Is Associated with Seizures: An Analysis of Online Psychedelic Experience Reports. Pharmacopsychiatry. https://doi.org/10.1055/a-1524-2794
- Nayak, S.M. et al. (2023). Naturalistic psilocybin use is associated with persisting improvements in mental health and wellbeing: Results from a prospective, longitudinal survey. Frontiers in Psychiatry, 14, 1199642. https://doi.org/10.3389/fpsyt.2023.1199642
- Phelps, J. (2017). Developing Guidelines and Competencies for the Training of Psychedelic Therapists. Journal of Humanistic Psychology, 57(5), 450–487. https://doi.org/10.1177/0022167817711304
- Trimbos Institute. (2023). Factsheet: Psychedelica in Nederland [Dutch public-health factsheet]; and Trimbos Institute (n.d.), Wat is het verschil tussen paddo's en truffels? Drugsinfo.nl. https://www.drugsinfo.nl/paddos-truffels/wat-is-het-verschil-tussen-paddos-en-truffels/
These are the citations used on this page. The full ~70-reference bibliography behind the complete evaluation framework is available in the framework itself.
FREQUENTLY ASKED QUESTIONS
How is "best" or "most reputable" actually determined on this page?
Rather than a subjective ranking, every provider above is compared against the Psilocybin Retreat Evaluation Framework — a ten-domain, evidence-graded protocol covering screening, medical presence, facilitator training, and integration depth. Evolute has also published its own self-disclosure against this same standard, so the comparison is checkable rather than asserted.
How does Evolute's facilitator-to-participant ratio compare to other Netherlands providers?
Evolute maintains a 1:2 ratio. Among the providers compared on this page, Synthesis Institute runs approximately 1:2.5, Beckley Retreats 1:3, and Kiyumi 1:4. There’s no universally validated ideal ratio, but a tighter ratio generally means more individual attention is available if someone needs it during the ceremony.
What medical and psychiatric safeguards does Evolute Institute have in place?
A Medical Doctor is physically present on-site throughout every EvoSHIFT ceremony, and every participant undergoes medical and psychiatric screening by a psychiatrist before acceptance. Of the six providers compared here, only Evolute and Beckley disclose an on-site MD.
What's included in Evolute's program beyond the four-day retreat itself?
The full arc runs three to twelve months and includes four individual 1:1 coaching sessions, structured group preparation and integration, and a discovery call with the founders before acceptance, not just the on-site ceremony.
