Friday, Jul 24, 2026 The claims desk. Receipts included. POWERED BY LENZ ↗
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HEALTH

The Claim

The placebo effect can occur even when individuals are aware they are receiving a placebo.

Verified by Lenz ·

The Short Version

This claim is true. Multiple peer-reviewed randomized controlled trials, systematic reviews, and neuroimaging studies — from institutions including Harvard, Oxford, and NIH — consistently demonstrate that open-label placebos (given with full patient knowledge) can produce measurable clinical benefits across conditions like pain, stress, anxiety, and opioid use disorder. The key qualifier "can occur" is well-supported. However, effects vary by condition, may depend on contextual factors like clinician interaction, and systematic reviews note moderate certainty due to risk-of-bias concerns.

Caveats

  • Open-label placebo effects are not universal — they are more consistently demonstrated for subjective symptoms (pain, stress, fatigue) and may not generalize to all medical conditions.
  • Many open-label placebo trials include explanatory rationales and clinician interaction; observed benefits may partly reflect these contextual healing factors rather than the inert pill alone.
  • Systematic reviews flag risk-of-bias concerns and moderate certainty, meaning the magnitude and reliability of open-label placebo effects should not be overstated for clinical decision-making.

The Receipts

  1. The Possibility of Open-Label Use of Placebo in Healthcare Practice: A Systematic Review of Recent Clinical Trials - PMC

    PMC

  2. The Fascinating Mechanisms and Implications of the Placebo Effect - PMC - NIH

    PMC - NIH

  3. Why a Placebo May Work Better When You Know It's a Placebo - Medscape

    Medscape

  4. Unraveling the mystery of placebo effect in research and practice

    PubMed Central (NIH)

  5. MSU study finds placebos reduce stress, anxiety and depression

    MSU Today

  6. Why do open-label placebos work? A randomized controlled trial of an open-label placebo induction with and without extended information about the placebo effect in allergic rhinitis | PLOS One - Our journal portfolio - PLOS

    PLOS One

  7. Open-Label Placebo Improved Outcomes in Opioid Use Disorder | Harvard Medical School

    Harvard Medical School

  8. A placebo can work even when you know it's a placebo - Harvard Health

    Harvard Health

  9. Placebos work even when patients know what they are

    Nuffield Department of Primary Care Health Sciences, University of Oxford

  10. Open-Label Placebo Effects on Psychological and Physical Well-Being: A Conceptual Replication Study - PMC

    PMC

+ 10 more sources — see the full list on Lenz

Filed Under

placebo effect