Psychedelic Science Newsletter
Issue #25February 23, 20267 studies

DMT cut depression scores by 7.35 points in 2 weeks vs placebo

This week brought some of the strongest clinical evidence yet for psychedelics in mental health treatment, with breakthrough results from controlled trials testing everything from DMT's rapid antidepressant effects to LSD microdosing protocols.

🧪 Single DMT dose beats placebo for depression in clinical trial

  • 34 adults with moderate-to-severe depression received either 21.5 mg DMT or placebo via IV infusion over 10 minutes, with psychotherapy support

  • DMT group showed 7.35-point greater reduction in depression scores (MADRS scale) at 2 weeks compared to placebo—a statistically significant difference

  • Effects lasted up to 3 months with no serious side effects, just mild issues like injection site pain, nausea, and temporary anxiety

Why it matters: This phase IIa trial provides controlled evidence that DMT—known for its ultra-short psychedelic experience—may offer lasting antidepressant benefits from a single session.

🏆 Top 0.1% journal 🔗 Nature medicine 🗓️ Feb 16

Key Findings

🔬 Psilocybin plus CBT shows promise in pilot depression trial

  • 16 participants completed psilocybin-assisted cognitive behavioral therapy (PA-CBT) with two doses (10 mg and 25 mg) plus 12 therapy sessions over 4 months

  • 13 of 16 participants showed at least 25% improvement by 3 months, with 9 achieving full remission

  • Effect sizes ranged from 1.9-2.7 (considered very large) and improvements were sustained at 3-month follow-up

💡 Combining psilocybin with structured CBT may enhance treatment outcomes compared to less structured therapy approaches.
🥉 Top 5% journal 🔗 Journal of affective disorders 🗓️ Feb 18

🧬 LSD microdosing improves daily mood in depression study

  • 19 participants with major depression took 8 μg LSD doses twice weekly for 8 weeks, with dose adjustments from 6-20 μg

  • Daily mood scores showed significant improvements on dosing days (creativity, happiness) compared to non-dosing days

  • No evidence of tolerance or sensitization despite repeated dosing over the 8-week period

💡 Microdosing may offer mood benefits without the intense psychedelic experience of higher doses.

🎯 Touch therapy gets mixed reviews in psilocybin treatment

  • 18 participants from a psilocybin clinical trial were interviewed about their experiences with therapeutic touch during sessions

  • Most valued having touch available and described it as fostering emotional connection and providing grounding during intense states

  • Some participants reported discomfort or distraction, highlighting the need for individualized consent and careful preparation

💡 Therapeutic touch may enhance psychedelic therapy when properly consented to, but requires careful attention to individual preferences and trauma history.
Top 20% journal 🔗 Brain and behavior 🗓️ Feb 17

🧠 Ayahuasca shows sustained depression relief in 280-person study

  • 280 adults at São Paulo clinics received ayahuasca treatment with psychotherapy support and were followed for 6 months

  • Depression scores (MADRS) showed significant reductions shortly after treatment that were sustained for up to 180 days

  • Benefits extended beyond depression to include improvements in anxiety symptoms and substance dependence

💡 Real-world ayahuasca treatment combined with therapy may provide lasting benefits across multiple psychiatric conditions.
Top 20% journal 🔗 Frontiers in psychiatry 🗓️ Feb 16

⚠️ Adolescent psilocybin exposure causes lasting brain changes in mice

  • Male and female mice received 3.0 mg/kg psilocybin every other day from postnatal days 40-50, then were tested 40-70 days later

  • Males showed more pronounced effects including reduced brain volume, altered water diffusivity, and decreased neuroplasticity protein markers in the prefrontal cortex

  • Both sexes showed increased functional brain connectivity and altered responses to rewarding and aversive stimuli

💡 Psychedelic exposure during adolescence may have long-term developmental consequences, particularly in males.
🥉 Top 5% journal 🔗 Neuropsychopharmacology 🗓️ Feb 18

💡 Ketamine's antidepressant effects don't require the 'trip'

  • 96 adults with alcohol use disorder received three weekly ketamine infusions (0.8 mg/kg) or placebo in a controlled trial

  • Ketamine produced strong psychoactive effects on all measured scales compared to placebo, but these effects didn't predict treatment success

  • Ketamine reduced alcohol consumption regardless of how intense the psychoactive experience was during infusion

💡 Ketamine's therapeutic benefits may work through biological mechanisms independent of the subjective drug experience.
🥉 Top 5% journal 🔗 Addiction (Abingdon, England) 🗓️ Feb 16

Implications

These studies suggest psychedelic medicine is moving toward more precise, evidence-based treatments with clearer protocols for different conditions. The data shows promise across multiple compounds and approaches, but also highlights the need for careful attention to dosing, timing, and individual patient factors—especially for vulnerable populations like adolescents.

Studies in this issue

Primary sources used for this newsletter.

  1. How psilocybin exposure during adolescence affects behavior, brain structure, brain connections, and sensory perception differently in males and females
    key findingNeuropsychopharmacology : official publication of the American College of Neuropsychopharmacology2026-02-18PMID 41708994
  2. How People Experience Healing Touch During Psilocybin Therapy
    key findingBrain and behavior2026-02-17PMID 41699875
  3. Psilocybin with cognitive behavioral therapy for major depression: Early trial results
    key findingJournal of affective disorders2026-02-18PMID 41707717
  4. LSD microdosing and its effects on mood and drug levels in major depression
    key findingProgress in neuro-psychopharmacology & biological psychiatry2026-02-19PMID 41713673