Synthesis is one of the leading international psilocybin retreats. Based in The Netherlands, it has a very international clientele. The services offered range from a weekend to 5-day retreats. The price does match the professional and scientific vibe.

The Company

“Synthesis offers legal, medically supervised, and scientific-based psychedelic retreats [near] Amsterdam. We make the psychedelic experience accessible for curious individuals who want to utilize moderate-to-high doses of psilocybin truffles to catalyze creative breakthroughs, explore consciousness, find meaning, improve confidence, and search for a mystical experience. Find out here what our customers say about us.”

Founded: 2018-04-01


  • Mental health (diverse)
  • Personal Growth

The Retreat

Synthesis offers 5 different retreats. The main retreat is the 3-day core retreat (as described below), this can also be done private (at a higher price). The other retreats all last 5 days and are for expansion, men, or women separately. The first day of the retreats are centred around the preparation and the last day around integration and sharing experiences.

“We offer an exclusive 3-day retreat [near] 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.”


  • Netherlands


  • 3 Days
  • 5 Days

Costs: from €2000 to €9000


  • Psilocybin (Mushrooms)

Group Size:

  • Private Retreat
  • 10-13 Participants
  • 14+ Participants

Guide Density:

  • 1 Participant per Guide
  • 5 Participants per Guide
  • 6 Participants per Guide

More information

Synthesis has access to four beautiful venues that they are using for the retreats.

They are working together with researchers at Imperial College London.

The advisory board is impressive and includes Robin Carhart-Harris and Rosalind Watts.

In July 2020 they raised $2.75 million to develop an end-to-end professional platform for psychedelic wellness & therapy.

Company Information

Synthesis Website

April, 2018


B2C Educational / Training Retreat

Compounds of Interest

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HQ / Office Weesperstraat 61, 1018 VN Amsterdam, Netherlands
Retreat Vuurse Steeg 1, 3749 AN Lage Vuursche, Netherlands
Retreat Spanbroekerweg 33, 1715 GH Spanbroek, Netherlands
Retreat Noorderstraat 2, 1901 MT Castricum, Netherlands