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Veterans Report Reduced TBI and Depression Symptoms Following Psilocybin Retreats, Study Finds

Updated on October 29, 2026 3 min read
Juana Written by Juana

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It is estimated that approximately 67% of U.S. military veterans have experienced at least one traumatic brain injury (TBI)¹. Among those deployed to Iraq or Afghanistan, an estimated 14% to 16% have been affected by PTSD or depression². For too many veterans returning from service, the invisible wounds of war persist well beyond their military service. But a new peer-reviewed study reveals that legal psilocybin retreat programs may help military veterans reduce symptoms of depression, anxiety, post-concussion syndrome, and psychological stress – offering a path that doesn’t rely solely on traditional pharmaceuticals or talk therapy. As debates around veteran mental health, psychedelic policy, and the limits of conventional care continue to gain urgency, this new research signals a meaningful path forward.

Closer Look at the Study

On July 10, 2025, Brain and Behavior published a landmark study titled “Exploring the Therapeutic Effects of Psychedelics Administered to Military Veterans in Naturalistic Settings.” The research followed 58 veterans who participated in legal psilocybin and ayahuasca retreats hosted by Beckley Retreats and Synthesis Institute. The findings are among the most comprehensive to date examining the long-term effects of psychedelics outside of clinical trial settings. The participants, most of whom had been previously diagnosed with PTSD, depression, anxiety, or traumatic brain injury (TBI), were assessed at three points: before the retreat, immediately after, and again three months later. All retreats combined psychedelic sessions with therapeutic preparation and integration, group processing, and trauma-informed support.

What the Data Shows

The veterans who participated in psilocybin retreats reported statistically significant reductions in:

    • Depression: 29.1% reduction (PHQ-9)
    • PTSD: 26.1% reduction (PCL-5)
    • Anxiety and stress
    • Post-concussion symptoms
    • Difficulties with reintegration into civilian life
These improvements were sustained three months after the retreat. The study also found increased psychological flexibility and improved emotional regulation, factors associated with resilience and long-term wellbeing. Psilocybin vs. Ayahuasca: Different Compounds, Different Strengths While both treatment groups showed meaningful mental health improvements, the data revealed some interesting distinctions:
    • Veterans in psilocybin retreats showed greater improvements in post-concussion symptoms, depression, and civilian reintegration
    • Ayahuasca participants experienced slightly greater reductions in PTSD symptoms
These findings point toward the potential for different compounds to support different needs – a promising insight for future research and program development. Why This Matters for Brain Injury and Veteran Recovery Traumatic brain injury creates a complex web of interconnected symptoms: persistent headaches, cognitive difficulties, emotional dysregulation, and disrupted sleep patterns. Military members who experienced a traumatic brain injury were more than twice as likely to suffer from PTSD later on than service members who did not suffer a TBI. These symptoms can persist for years, and conventional treatments often address only individual symptoms rather than the whole person. This research suggests that psychedelic retreat programs, when delivered in safe, legal, and supportive environments, may offer a multi-dimensional approach to transformation and change. Rather than simply targeting one diagnosis, these experiences appear to support broader psychological wellbeing – clarity, connection, purpose, and the capacity to respond differently to stress. For veterans struggling with the compound effects of TBI and psychological trauma, this holistic approach may represent exactly the kind of comprehensive care that’s been missing from traditional treatment options.

The Science Behind the Success

The study’s rigor adds weight to its promising findings. Senior author Dr. Robin Carhart-Harris, head of the Carhart-Harris Lab at UCSF, noted: “These findings add to the growing body of evidence suggesting that psilocybin, when used in safe and legal settings with proper support, may lead to long-lasting improvements in mental health for veterans and others with complex trauma.” The research design included comprehensive pre-screening, professional therapeutic support throughout the process, and structured integration sessions to help participants process and apply insights from their experiences. Tools and Rigor Behind the Research To ensure reliable and nuanced data, researchers used a comprehensive suite of validated instruments, including:
    • Depression, Anxiety, and Stress Scales (DASS-21)
    • Patient Health Questionnaire (PHQ-9)
    • State-Trait Anxiety Inventory (STAI-T)
    • Post-Concussion Symptom Questionnaire (RPQ)
    • Military to Civilian Questionnaire (M2C-Q)
    • PTSD Checklist for DSM-5 (PCL-5)
    • Quality of Life After Brain Injury (QOLIBRI)
These assessments helped researchers track both clinical symptoms and overall functioning. What This Means for the Future of Veteran Care The mental health crisis among veterans demands innovative solutions. With nearly 414,000 service members worldwide having sustained TBI between 2000 and late 2019, and traditional treatments often falling short for complex trauma cases, this research points toward a potentially transformative approach. The future of veteran mental health care likely won’t be found in any single treatment, but in comprehensive systems that address healing at multiple levels – biological, psychological, social, and spiritual. This study represents a significant step toward that more complete vision. Moving Forward Responsibly At Beckley Retreats, we remain committed to building on this foundation responsibly. While more research is needed, these findings reflect what many in our community have long sensed: with the right preparation and environment, personal transformation may be possible. If you’re a veteran navigating the aftereffects of TBI, PTSD, depression, or reintegration challenges, know that new options are emerging. Beckley also offers veteran-specific retreat programs, and our team can help explore whether one may be a fit for you. For additional mental health resources, veterans can also reach out to organizations like the Heroic Hearts Project, Veterans Exploring Treatment Solutions, Veterans Community Living Centers, Wounded Warrior Project, or speak with a VA mental health professional about emerging treatment options.

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References:

[1] https://biausa.org/public-affairs/media/studying-tbi-in-veteran-populations [2] https://www.ncbi.nlm.nih.gov/books/NBK572092/

Before you apply

Beckley runs legal, guided psilocybin retreats in Jamaica and psilocybin retreats in the Netherlands: four weeks of preparation, two guided sessions on retreat, six weeks of integration, online and at your own pace, one to two hours a week. Plain answers to the questions people ask first:

What a psilocybin retreat costs · What happens, day by day · Jamaica or the Netherlands · Who should not attend · What research shows about lasting change · Apply

depression• integration• psilocybin• veterans• science & research

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