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Why People Said Oregon Psilocybin Services Improved Mental Well Being

The largest Oregon study of regulated psilocybin found most participants reported benefits and only a few serious adverse reactions.

  • On Wednesday, an Oregon Health & Science University-led study published in JAMA Network Open found that 346 participants in Oregon's regulated psilocybin program reported improved mental health with high safety, marking the most rigorous analysis of the non-medical model to date.
  • Oregon voters approved Measure 109 in 2020, establishing a non-medical model where adults 21 and older can access psilocybin at licensed service centers under supervision of trained facilitators without prescriptions or medical referrals.
  • Among the 346 participants, most reported improved well-being, though four first-time users experienced "serious adverse reactions" requiring medical attention. Researchers noted these events were rare, occurring in 1.2% of the study group.
  • Lead author Dr. Todd Korthuis told NPR "The data has swayed me," while Balzs Szigeti, a clinical data scientist at the University of California, San Francisco, said the program's safe operation is "definitely good news for psilocybin."
  • OHSU researchers secured a $3.3 million, five-year federal grant to study psilocybin's effect on substance use, while the Oregon Health Authority discusses doubling licensing fees for centers and facilitators to address budget shortfalls.
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Bias Distribution

  • 62% of the sources are Center
62% Center

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npr broke the news in Washington, United States on Wednesday, August 19, 2026.
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