Scientific Research on Reiki

Scientific studies on Reiki have multiplied over the past two decades, particularly in the fields of complementary medicine and integrative oncology. Below is an overview of current clinical data on the subject.

Documented Physiological Effects

Autonomic Nervous System

Studies measuring heart rate variability (HRV), blood pressure, and skin conductance show a significant shift from the sympathetic nervous system (stress/fight) to the parasympathetic system (relaxation/recovery).

Stress Markers

A decrease in salivary cortisol levels has been observed after Reiki sessions compared to control groups.

Clinical Application Areas

Pain Management

Several controlled trials indicate a perceived reduction in postoperative and chronic pain.

Anxiety and Depression

Measurable decreases in anxiety scores (STAI scales) have been reported among patients undergoing major medical or oncological treatments.

Quality of Life in Oncology

Reduced cancer-related fatigue, improved sleep, and overall well-being in patients receiving chemotherapy or radiotherapy.

Main Methodological Limitations

Placebo Effect and Control Groups

Implementing a “sham Reiki” (performed by an untrained person) is difficult to standardize, making strict blinding complex.

Sample Size

Many published studies rely on small participant groups, requiring larger meta-analyses to confirm the scope of results.

Systematic reviews published in indexed journals (such as PubMed or the Journal of Alternative and Complementary Medicine) generally conclude that Reiki is a safe and effective complementary intervention to promote relaxation and reduce stress and pain, while recommending further large-scale research.

Official Scientific Databases

PubMed (National Library of Medicine)

The reference search engine for medical publications. Keywords such as Reiki systematic review, Reiki pain, or Reiki anxiety lead directly to abstracts and often full articles. 🔗 https://pubmed.ncbi.nlm.nih.gov/ (pubmed.ncbi.nlm.nih.gov in Bing)

NCCIH (National Center for Complementary and Integrative Health)

The U.S. agency for complementary health provides a concise information sheet summarizing the state of research and scientific evaluation on Reiki. 🔗 https://www.nccih.nih.gov/

Major Systematic Reviews and Meta-Analyses

Meta-analysis on Anxiety (2024)

Published in BMC Palliative Care, compiling several clinical trials on Reiki’s effectiveness in reducing anxiety and stress. 🔗 PubMed Central (PMC): https://www.ncbi.nlm.nih.gov/pmc/ (ncbi.nlm.nih.gov in Bing)

Review on Pain and Quality of Life (2019)

Published in BMJ Supportive & Palliative Care, analyzing Reiki’s role in pain reduction and quality-of-life improvement. 🔗 PubMed: https://pubmed.ncbi.nlm.nih.gov/ (pubmed.ncbi.nlm.nih.gov in Bing)

Cochrane Systematic Review (2015)

Evaluates the methodological rigor of randomized controlled trials on Reiki for anxiety and depression. 🔗 Cochrane Library: https://www.cochranelibrary.com/

Clinical Trials in Oncology

Study on Anxiety and Pain in Oncology (2012)

Published in the American Journal of Hospice and Palliative Medicine, measuring Reiki’s impact on oncology day-center patients. 🔗 PubMed: https://pubmed.ncbi.nlm.nih.gov/ (pubmed.ncbi.nlm.nih.gov in Bing)

ClinicalTrials.gov Registry

Lists ongoing research protocols, including study NCT06354049 on symptom improvement in cancer patients. 🔗 https://clinicaltrials.gov/

Studies on Animals and Plants

Research has also been conducted on animals and plant organisms, offering methodological advantages by eliminating psychological placebo effects.

Animal Studies

Physiological Stress Reduction (Rats)

University of Arizona studies (Ann Linda Baldwin, 2006 & 2008) showed significant decreases in heart rate and microvascular stress damage in Reiki-treated rats compared to sham Reiki.

Veterinary Applications

Observational and clinical studies evaluate Reiki’s use in dogs and horses to accelerate postoperative recovery, calm anxious behaviors, and reduce stress biomarkers.

Plant and Biological Model Studies

Germination and Growth Rates

Laboratory trials on seeds (radish, barley, cress) sometimes show increased germination and growth speed compared to controls.

Resilience to Water or Chemical Stress

Protocols compare recovery in stressed plants (drought, salinity) treated with intention/Reiki versus untreated controls.

In Vitro Culture and Microorganisms

Research explores effects on cell cultures and yeast germination, though replicability remains debated.

These studies are less common than human trials but are frequently cited when analyzing Reiki’s impact on autonomous biological systems.

Database References

Reiki and Microvascular Stress Damage in Rats (2006)

Published in The Journal of Alternative and Complementary Medicine. Shows significant reduction of sound-induced microvascular lesions in Reiki-treated rodents.

Reiki and Heart Rate Homeostasis in Rats (2008)

Also from the University of Arizona, demonstrating Reiki’s ability to regulate heart rate during acute sound stress.

Energy Therapies and Sound on Seed Germination (2004)

Published on PubMed (NCBI) by K. Creath & G.E. Schwartz. 🔗 https://pubmed.ncbi.nlm.nih.gov/ (pubmed.ncbi.nlm.nih.gov in Bing)

Intention-Modulated Germination (2001)

Double-blind study on intention-infused water affecting germination rates of peas and wheat.

🔗 https://www.researchgate.net/ https://www.researchgate.net