Evidence & Research on Reiki and Biofield Therapies
Research on Reiki and related biofield therapies has grown substantially, but the evidence is not uniform. Some studies and recent reviews report improvements in outcomes such as anxiety, pain, and quality of life, while other studies find mixed, nonsignificant, or sham-comparable results.
This page reviews that evidence as it currently stands. It separates clinical outcomes from physiological observations and proposed mechanisms, distinguishes Reiki from other biofield therapies, and includes limitations and unanswered questions alongside supportive findings.
Evidence reviewed through September 2026.
What Does the Research Landscape Look Like?
The research literature is larger than a handful of isolated studies. A 2025 scoping review identified 353 human intervention studies of biofield therapies, including 255 randomized controlled trials. Reiki was represented in 88 studies, Therapeutic Touch in 71, Healing Touch in 31, and external qigong in 16. The studies covered a wide range of populations and outcomes.
That volume is important, but study count is not the same thing as evidence of effectiveness. The review was designed to map the research landscape rather than calculate a pooled treatment effect. It also found substantial variation in interventions, populations, outcomes, controls, and reporting. The authors concluded that inconsistent research and reporting continue to limit firm conclusions about effectiveness for specific conditions.
Evidence summary
2025 Biofield-Therapy Research Landscape
What was studied: 353 human intervention studies across multiple biofield-therapy modalities and populations.
Finding: The literature is substantial and includes many randomized trials.
Material limitation: This was a scoping review designed to map the field, not determine efficacy, effectiveness, or safety. Study counts and result-direction counts should not be treated as pooled evidence of benefit.
How We Evaluate the Research
Different studies answer different questions.
A systematic review or meta-analysis may combine evidence across multiple studies. A scoping review maps what research exists but does not necessarily determine whether an intervention is effective. A randomized trial can provide stronger evidence of treatment effects than an uncontrolled study, while a credible sham comparison can help researchers examine whether outcomes exceed effects associated with attention, expectation, rest, touch, or the treatment setting.
The quality of the comparison matters particularly in Reiki research. A 2026 review of sham-Reiki protocols found that only 35 of 154 eligible in-person Reiki randomized trials included a sham group, and sham groups themselves sometimes improved. Those findings do not show that Reiki is simply a placebo. They do show why well-designed controls are important when asking what effects are specific to Reiki.
Researchers within the biofield field have also developed Biofield Therapies: Reporting Evidence Guidelines (BiFi REGs) intended to improve the transparency and reproducibility of clinical trials. These guidelines address intervention details and established clinical-trial reporting requirements, including harms and unintended effects.
A positive result is a finding to understand, not automatic proof of established efficacy. Likewise, a null result is part of the evidence rather than evidence to hide.
What Does Clinical Research Show?
Clinical findings are most useful when they stay tied to the modality, population, comparator, and outcome that were actually studied. The strongest current Reiki evidence is concentrated around anxiety and stress, pain in selected settings, and quality of life.
Anxiety & Stress
Anxiety is one of the better-developed areas of Reiki research.
A 2024 meta-analysis included 824 participants and found an overall reduction in anxiety favoring Reiki, with a standardized mean difference of −0.82. The authors also reported that results varied by population and that findings were less consistent for some forms of preoperative and cancer-related anxiety.
More recent controlled trials continue to produce both supportive and mixed findings. In a 2026 sham-controlled study of mechanically ventilated intensive-care patients, Reiki was associated with greater reductions in pain and anxiety than sham Reiki. Other studies have found that one outcome improves while another does not, which argues against treating “Reiki works” as a single all-or-nothing conclusion.
Current interpretation
Anxiety & Stress: Supportive but Heterogeneous
Finding: A recent meta-analysis reported a pooled anxiety reduction favoring Reiki.
What qualifies it: Results varied substantially across populations and study designs, so the pooled result should not be treated as a universal anxiety-reduction claim.
Source: Guo et al., Therapeutic effects of Reiki on interventions for anxiety: a meta-analysis (2024).
Pain
Pain has also been studied in a range of clinical settings.
A systematic review of Reiki for cancer-related pain identified seven experimental or quasi-experimental studies involving 572 participants. Five studies reported pain reductions, while two did not. The reviewers described the findings as positive but limited and called for more high-quality randomized research.
More recent sham-controlled work adds to that evidence. In the 2026 intensive-care trial noted above, Reiki produced greater pain reduction than sham Reiki.
Current interpretation: Several controlled studies report favorable pain outcomes, and pain is one of the more consistently investigated Reiki outcomes. The evidence is nevertheless heterogeneous and does not support a universal pain-relief claim.
Quality of Life
A 2025 meta-analysis of 11 randomized controlled trials involving 661 participants reported a statistically significant improvement in quality of life with Reiki. The pooled effect was small, with a standardized mean difference of 0.28.
The size of the effect matters. A statistically significant result does not automatically imply a large or clinically important improvement for every person. Populations, Reiki protocols, session frequency, and quality-of-life measures also differed among the included studies.
Current interpretation
Quality of Life: Small Supportive Pooled Effect
Finding: Eleven randomized trials produced a small pooled quality-of-life effect favoring Reiki.
What qualifies it: The studies were heterogeneous, and individual populations and measures differed. The pooled result should be described proportionately rather than as a large or universal improvement.
Other Outcomes Studied
Fatigue, sleep, depressive symptoms, relaxation, comfort, and emotional wellbeing have also been investigated. Some studies report favorable outcomes, particularly within oncology, chronic illness, and supportive-care populations, but these evidence bases are generally smaller or less consistently synthesized than the literature for anxiety, pain, and quality of life.
For that reason, these outcomes are best described as promising or developing areas of research rather than established benefits.
Supportive & Palliative-Care Settings
Reiki and Therapeutic Touch have been studied as complementary approaches in palliative and end-of-life care, where researchers have evaluated symptoms including pain, anxiety, depression, fatigue, stress, sleep, relaxation, and emotional wellbeing.
A 2026 systematic review identified nine studies involving 415 participants. Some reported improvements in symptoms or quality-of-life domains, but the reviewers judged the overall evidence to be very low certainty because of small numbers of studies, methodological limitations, heterogeneity, and other sources of uncertainty.
These studies concern supportive and symptom-related outcomes. They do not show that Reiki or Therapeutic Touch treats the underlying disease.
Evidence Across Biofield Therapies
Research grouped under the term biofield therapy includes distinct practices. Evidence for one modality should not automatically be transferred to another. For a broader explanation of the category and how these practices differ, see What Is Biofield Therapy?
Reiki
Reiki has the largest research literature among the modalities emphasized here and currently has the strongest recent modality-specific syntheses. Supportive findings are most apparent for anxiety and stress, pain in selected contexts, and quality of life, while mixed and null findings remain part of the literature.
Therapeutic Touch
Therapeutic Touch also has a substantial clinical literature. A 2021 rapid evidence assessment identified 21 studies involving 1,302 participants; 18 reported favorable outcomes, but only four were judged to have low risk of bias, and the reviewers concluded that high-quality evidence was lacking for the claimed benefits.
This makes Therapeutic Touch a useful example of why positive-study counts and evidence quality must be considered together.
Healing Touch
Healing Touch has a smaller research base. Recent studies continue to examine symptom and recovery outcomes. In a 2026 randomized trial in patients undergoing coronary artery bypass surgery, patient-reported anxiety and distress decreased following Healing Touch sessions, while rates of postoperative atrial fibrillation and delirium did not significantly differ from standard care.
The study illustrates an important distinction: improvement in a subjective symptom does not necessarily mean that harder clinical outcomes changed.
External Qigong
The intervention literature for practitioner-delivered external qigong is considerably smaller and older. The 2025 biofield-therapy map identified 16 studies. Older systematic reviews found encouraging results in some pain comparisons but inconsistent or nonsignificant findings in others and called for stronger trials.
Research in which people practice qigong exercises themselves should not automatically be treated as evidence for external qigong delivered by another practitioner.
What About Distance Reiki?
Distance Reiki should be evaluated separately from in-person Reiki.
The 2025 research landscape review identified only 10 studies specifically classified in the broader category of “distant or remote healing,” considerably fewer than the number of in-person Reiki studies.
More recent distance-Reiki research remains limited. A 2024 randomized trial involving nursing students examined distance Reiki for test anxiety and academic performance. The study did not demonstrate a clear significant treatment effect across the anxiety measures, and final academic performance did not significantly differ between groups.
Some studies combine in-person and distance Reiki within the same intervention. Those designs cannot tell us whether any observed result was produced by the distance component specifically.
Current interpretation: Evidence for distance Reiki remains limited and inconclusive. Findings from in-person Reiki should not be assumed to apply equally to distant practice, and current research does not establish a nonlocal or quantum mechanism.
What Does the Research Say About Safety?
Reiki and related noninvasive biofield practices appear to have a low direct physical-risk profile in much of the published literature, but the safety evidence is less complete than statements such as “completely safe” or “no side effects” would suggest.
The 2026 palliative-care systematic review found that harms reporting was limited: only one of the nine included studies explicitly monitored adverse events, and that study reported one serious event considered potentially related to the intervention. The relationship remained uncertain. The reviewers therefore cautioned against drawing firm safety conclusions from the available evidence.
The most accurate distinction is between few documented direct harms and proof that harms do not occur. Those are not the same thing.
Important Context
Reiki and other biofield practices are best understood as complementary approaches. They should not replace appropriate medical or mental-health evaluation, diagnosis, or treatment.
What Has Been Measured Physiologically?
Researchers have measured cardiovascular, hormonal, electrophysiological, inflammatory, and other physiological variables during studies of Reiki and related practices.
Some controlled studies have reported changes in measures such as heart rate or blood pressure. In the 2026 intensive-care trial, Reiki was associated with greater reductions in heart rate and diastolic blood pressure than sham Reiki.
Other findings are more difficult to interpret. In a 2024 randomized cardiac study, post-treatment cortisol was lower in both the Reiki and sham-Reiki groups than in the no-treatment control group. Electrocardiogram findings did not significantly differ among groups, although anxiety scores were lower in the Reiki group.
That distinction matters. A physiological measure can change during a study without demonstrating why it changed or whether that change caused the clinical outcome.
Immune and inflammatory biomarkers have also been explored, but current evidence is too preliminary and inconsistent to support claims that Reiki “boosts immunity” or improves clinical immune defense.
Measurement is evidence of what was observed. It is not automatically evidence of mechanism.
For deeper background on measurable biological phenomena, bioelectricity, biomagnetism, and ultraweak photon emission, see What Is the Biofield?
How Might Reiki Work?
The mechanism of Reiki remains unresolved.
Mechanism boundary: Clinical outcomes, biomarker changes, and established adjacent biology can generate hypotheses, but they do not by themselves demonstrate a Reiki-specific causal mechanism.
Autonomic and Physiological Hypotheses
Because researchers sometimes observe changes in heart rate, blood pressure, heart-rate variability, cortisol, or subjective relaxation, autonomic regulation has been proposed as one possible pathway.
These findings make autonomic questions reasonable to investigate. They do not establish that Reiki works by stimulating the vagus nerve or activating the parasympathetic nervous system. A causal mechanism would require evidence that the physiological change mediates the clinical effect rather than simply occurring alongside it.
Bioelectric, Electromagnetic and Photonic Hypotheses
Electrical and magnetic processes are fundamental to biology. Cells maintain membrane potentials, nervous and cardiac activity can be measured electrophysiologically, and living biological systems also emit extremely low levels of light known as ultraweak photon emission.
Ultraweak photon emission is a real measurable phenomenon associated largely with metabolic and oxidative processes. A 2024 review summarizes the phenomenon, its measurement, and proposed biological roles.
That does not establish that Reiki operates by changing photons, electromagnetic fields, or endogenous bioelectric signaling. A 2025 narrative review proposed ultraweak-photon-mediated biocommunication as one possible model for biofield therapies while explicitly calling for further experimental validation.
Established biology can make a hypothesis scientifically investigable without demonstrating the bridge to Reiki.
Coherence, Information and Quantum Proposals
Quantum biology is a legitimate research field. Quantum effects are investigated in specific biological systems including photosynthetic energy transfer, enzyme reactions, spin-dependent processes, and other molecular phenomena. A 2026 review summarizes established and developing areas of quantum biology.
That does not mean Reiki has been shown to work through quantum entanglement, nonlocality, or another quantum mechanism.
Quantum and information-based explanations do appear in some biofield literature, but they remain theoretical unless studies directly demonstrate the proposed mechanism during the intervention. General quantum biology cannot substitute for Reiki-specific evidence.
Traditional Reiki Explanations
Within Reiki traditions, practice is commonly understood through concepts of ki or universal/life-force energy. Related traditions may use terms such as qi or prāṇa.
These traditional and spiritual frameworks are important to the history and identity of the practices. Scientific research can examine outcomes and measurable physiology without assuming that traditional energetic concepts have been identified as electromagnetic fields, photons, quantum phenomena, or established anatomical structures.
The traditional explanation and the scientific mechanism question can therefore be presented together without treating them as the same kind of claim.
For deeper foundational context, see What Is the Biofield? and What Is Reiki?
Why Is the Evidence Still Difficult to Interpret?
The main challenge is not simply that some studies are positive and some are not. Studies often differ in population, session length, number of sessions, practitioner background, touch versus non-touch delivery, comparison group, outcome measure, and follow-up period.
- Small samples: many individual trials remain underpowered.
- Heterogeneity: populations, interventions, comparators, and outcomes differ substantially.
- Sham-control quality: credible controls remain relatively uncommon in Reiki research.
- Blinding limitations: practitioner blinding is generally not possible, while participant and assessor blinding varies.
- Subjective outcomes: pain, anxiety, wellbeing, and quality of life are meaningful but can also be influenced by expectation, attention, and therapeutic context.
- Replication: a promising finding in one population may not yet have been independently reproduced.
- Safety reporting: adverse-event monitoring has often been inconsistent.
- Modality and delivery aggregation: Reiki, Therapeutic Touch, Healing Touch, external qigong, in-person delivery, and distant delivery should not be treated as interchangeable.
The 2026 sham-Reiki review illustrates one of these challenges: relatively few in-person Reiki randomized trials included a sham group, and sham interventions sometimes produced improvements. The Therapeutic Touch evidence assessment similarly found that a high proportion of positive studies could coexist with substantial design and bias concerns.
These limitations do not mean the research should be dismissed. They determine how much confidence a particular finding deserves.
What Remains Uncertain?
The current evidence leaves important questions open. Those questions are part of the science, not a failure of it.
Research Questions We’re Watching
- Will larger and better-controlled Reiki trials reproduce the current anxiety, pain, and quality-of-life signals?
- Can Reiki-specific effects be distinguished more clearly from rest, attention, expectation, touch, and therapeutic context?
- Will emerging findings for fatigue and sleep replicate across different populations?
- Will newer distance-Reiki research strengthen, weaken, or substantially change the current limited evidence picture?
- Can physiological changes be shown to mediate clinical outcomes rather than simply accompany them?
- Will better adverse-event monitoring change the current understanding of safety?
- Can any proposed autonomic, electromagnetic, bioelectric, photonic, information-based, or other mechanism be directly tested and independently replicated?
The evidence on this page will be reconsidered when new research materially changes these questions or the balance of findings.
Selected Research & Sources
This is a curated source trail for the synthesis above, not an exhaustive bibliography. The internal living-evidence register is broader and includes additional supportive, mixed, null, methodological, safety, and frontier sources.
Research Landscape & Methods
Biofield Therapies Clinical Research Landscape: A Scoping Review and Interactive Evidence Map
Maps 353 human intervention studies across multiple biofield modalities. Useful for field size and research distribution; not designed to determine efficacy or safety.
Biofield Therapies: Guidelines for Reporting Clinical Trials
BiFi REGs supplement CONSORT with biofield-therapy intervention reporting details and support more transparent, reproducible trials.
Investigation and Assessment of Sham Reiki Protocols in Reiki Research
Examines sham-Reiki protocols and placebo responses, highlighting why control design matters when trying to isolate Reiki-specific effects.
Clinical Outcomes
Therapeutic Effects of Reiki on Interventions for Anxiety: A Meta-analysis
Reports a pooled anxiety reduction across 824 participants, with meaningful variation across populations and study contexts.
Does Reiki Benefit Mental Health Symptoms Above Placebo?
Reviews 14 placebo-controlled trials. Reports supportive signals for some symptom categories while emphasizing small evidence groups and risk-of-bias concerns.
Effects of Reiki Therapy on Quality of Life: A Meta-analysis of Randomized Controlled Trials
Eleven RCTs and 661 participants; reports a small pooled quality-of-life effect with significant heterogeneity.
The Effect of Reiki on Pain Applied to Patients With Cancer: A Systematic Review
Seven studies and 572 participants; five studies reported pain reduction and two did not. The review calls the evidence positive but limited.
Finds some favorable symptom and quality-of-life reports but rates the overall evidence very low certainty and identifies major limitations in harms reporting.
Other Biofield Modalities
A Rapid Evidence Assessment of Recent Therapeutic Touch Research
Identifies 21 studies and many positive reports, while finding that most studies had substantial methodological limitations and that high-quality evidence was lacking.
Reports lower patient-reported anxiety/distress after Healing Touch sessions while postoperative atrial fibrillation and delirium did not significantly differ.
Physiology & Mechanism Context
Effect of Reiki on Pain, Anxiety, and Hemodynamic Parameters in Mechanically Ventilated Patients
Contemporary sham-controlled evidence for pain, anxiety, and selected hemodynamic changes in one specific intensive-care population.
Useful for distinguishing symptom findings from physiology: anxiety favored Reiki, cortisol was lower in both Reiki and sham versus control, and ECG findings did not significantly differ.
Ultra Weak Photon Emission—A Brief Review
Reviews established UPE biology, measurement, and proposed roles. It provides adjacent biophysical context, not evidence that UPE mediates Reiki.
Advancing Biophysics in Energy-Based Clinical Interventions: A Narrative Review
Proposes UPE-mediated biocommunication as a possible model for biofield therapies and explicitly calls for further experimental validation.
Quantum Biology: From Mechanisms to Medicine
Provides contemporary context for experimentally studied quantum phenomena in biology. It is adjacent science and does not establish a quantum Reiki mechanism.
Distance Research
A useful recent distance-Reiki trial with mixed/limited findings; it does not establish equivalence with in-person Reiki or a nonlocal mechanism.
Continue Exploring
Build the foundation behind the research with the core Biofield Transformations learning resources.
What Is Reiki?
Explore Reiki history, terminology, practice, and traditional context.
What Is the Biofield?
Explore measurable biological phenomena, scientific constructs, frontier hypotheses, and traditional frameworks.
What Is Biofield Therapy?
Explore modality definitions, how these practices are used, and general scope and safety.