Reiki: Systematic Review

Summary

Lee et al. conducted one of the most comprehensive systematic reviews of Reiki therapy, examining evidence across multiple conditions. The review assessed clinical trials of Reiki for pain management, anxiety, depression, and various chronic conditions. The overall conclusion was that the evidence base for Reiki remains weak, with most studies suffering from significant methodological limitations that prevent firm conclusions about efficacy.

Key findings

Of the studies reviewed, most were small, poorly controlled, and at high risk of bias. Some trials reported positive effects on pain and anxiety outcomes, but these were generally not replicated in higher-quality studies. No consistent physiological mechanism for Reiki has been identified. The review found no evidence supporting claims that Reiki can treat specific diseases or conditions beyond placebo effects.

Methodology

The systematic review followed standard systematic review methodology, searching multiple databases for randomized and quasi-randomized trials. Studies were assessed for risk of bias using standard criteria. Heterogeneity across studies prevented meaningful meta-analysis for most outcomes.

Criticism / Limitations

The review highlighted fundamental problems with the Reiki evidence base: inadequate sample sizes, lack of proper blinding, inconsistent outcome measures, and absence of plausible biological mechanisms. Many studies failed to account for therapeutic contact and attention as confounding variables.

Verification notes

The conclusion that Reiki lacks strong evidence is consistent with assessments by major health organizations including the Australian NHMRC and the UK’s NHS. Individual positive studies do not change the overall assessment of weak evidence quality. Practitioner and patient expectations likely account for reported benefits in uncontrolled studies.

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