The Science Behind Reiki: What Research Actually Says
SCIENTIFIC STUDIES
5 min read
The Science Behind Reiki:
For many people, the experience of Reiki is difficult to describe. You may leave a session feeling calmer, lighter, more grounded, or simply more connected to yourself. But what does science have to say about it?
Reiki has increasingly become the subject of clinical research, particularly in areas such as stress, anxiety, pain, relaxation, and quality of life. While some studies have produced encouraging results, the scientific picture is still developing. Understanding that distinction is important. Reiki doesn't have to be presented as a cure or replacement for medical treatment to be a meaningful part of someone's wellness practice.
The National Center for Complementary and Integrative Health (NCCIH), part of the National Institutes of Health, notes that there is currently no scientific evidence establishing the existence of the energy field proposed in Reiki. It also states that research has not clearly demonstrated Reiki's effectiveness for a specific health-related purpose.
That doesn't mean researchers haven't observed interesting results. It means we're still trying to understand what happens during Reiki, why some people report benefits, and which effects can reliably be separated from factors such as relaxation, attention and expectation.
Reiki and the Nervous System
One way of thinking about the experience of Reiki is through relaxation.
Modern life can leave us feeling as though we're constantly "on." Work, responsibilities, phones, family, relationships and endless stimulation can make it difficult to slow down. A Reiki session intentionally creates a very different environment: you are usually lying or sitting comfortably, stimulation is reduced, and you're given uninterrupted time to rest. Some studies have also measured physiological outcomes such as heart rate and blood pressure alongside people's reports of pain and anxiety. For example, a randomized placebo-controlled study of mechanically ventilated patients reported lower pain and anxiety following Reiki compared with sham Reiki, along with differences in heart rate and diastolic blood pressure.
These findings are interesting, but they shouldn't be interpreted as proof that Reiki has been shown to regulate the nervous system through an energy mechanism. Instead, they raise questions researchers can continue investigating about the relationship between Reiki, relaxation and physiological responses.
What Does the Research Say About Anxiety?
Anxiety is one of the more frequently studied outcomes in Reiki research.
A 2024 meta-analysis examining Reiki and anxiety included 824 participants. The researchers found an overall reduction in anxiety associated with Reiki, although the results varied depending on the population and circumstances being studied.
Individual studies haven't always reached the same conclusion.
For example, a randomized trial involving third-molar surgery patients compared Reiki with sham Reiki and no intervention. Reiki was associated with lower postoperative pain, but it did not significantly reduce preoperative anxiety compared with the other groups.
That difference is important.
Scientific research isn't simply about finding studies that show something works. Researchers also look at studies where an intervention doesn't produce the expected effect.
Taken together, the evidence suggests there may be something worth continuing to investigate, rather than providing a final answer about Reiki and anxiety.
What About Pain?
Pain is another area researchers have explored.
A recent systematic review and meta-analysis examined 15 randomized controlled trials involving 1,219 surgical patients. Researchers reported reductions in postoperative pain and anxiety associated with Reiki.
However, the authors rated the evidence as only moderate to low certainty and emphasized that the studies were limited in number and often had relatively small samples. They specifically called for larger, rigorously designed trials, including sham-controlled research.
Research involving people with cancer has produced similarly interesting but mixed findings. A systematic review covering 572 patients found reductions in pain in five included studies, while two studies did not find Reiki effective for pain.
This is why it's more accurate to say some studies suggest Reiki may help people with their experience of pain rather than saying Reiki has been proven to treat pain.
Reiki and Quality of Life
Researchers have also begun looking beyond individual symptoms.
A 2025 meta-analysis of randomized controlled trials examined Reiki and quality of life. Across 661 participants, the researchers found a statistically significant, though relatively modest, improvement in quality of life following Reiki.
This area may be particularly relevant when thinking about Reiki as a complementary wellness practice.
Well-being isn't always about "fixing" something.
Sometimes it's about creating space to rest, reconnect with yourself, become more aware of what you're feeling, and feel supported while navigating difficult periods of life.
Could the Benefits Be a Placebo Effect?
This is one of the most important questions in Reiki research.
Researchers sometimes use sham Reiki, where someone mimics the actions of a Reiki practitioner without intentionally practicing Reiki. Why? Because simply lying quietly in a relaxing environment while receiving focused attention could potentially make someone feel better. Expectation matters too. If you believe an experience will be relaxing, that expectation itself may influence how you feel. Scientists therefore want to know whether Reiki produces effects beyond these contextual factors.
The results so far aren't simple. Some placebo-controlled studies have reported differences between Reiki and sham Reiki, while the overall research literature remains inconsistent. That's one reason major scientific bodies such as the NCCIH currently conclude that Reiki hasn't been clearly demonstrated to be effective for a health-related purpose. And "placebo" shouldn't necessarily be interpreted as "imaginary." The experience of receiving care, slowing down, feeling safe, setting an intention and taking time away from everyday stress can itself influence how someone experiences their body and emotions. The scientific question is which effects are specifically attributable to Reiki and which come from the larger experience surrounding the session.
We don't have a definitive answer yet.
Where Spirituality and Science Meet
Reiki comes from a tradition that talks about concepts such as energy, balance and connection.
Science operates differently. Researchers need something that can be observed, measured and repeatedly tested. At present, the energy field described in Reiki traditions has not been scientifically established. For someone who practices or receives Reiki, however, the experience may still carry personal or spiritual meaning. Those two perspectives don't necessarily need to compete. You can appreciate Reiki as a spiritual or energetic practice while also acknowledging the limits of what science currently knows about it. In fact, curiosity may be a better approach than certainty.
So, Does Reiki "Work"?
The most accurate answer right now is: research is still developing.
Some randomized trials and systematic reviews have reported promising results involving anxiety, pain, stress and quality of life. Other studies haven't found significant benefits, and limitations such as small sample sizes, study design and difficulty creating convincing placebo controls make the evidence harder to interpret. Reiki therefore shouldn't be considered a replacement for medical or mental-health treatment. Instead, it can be approached as a complementary wellness practice — something that may exist alongside appropriate medical care, therapy, movement, meditation and other forms of self-care.
Making Space for Yourself
Perhaps one of the simplest aspects of Reiki is also one of the easiest to overlook. For a period of time, you're being asked to do very little. You don't have to answer an email. You don't have to solve a problem, You don't have to perform for anyone. You can simply slow down and notice what is happening within you.
Science is continuing to investigate what Reiki can and cannot do. We don't have to exaggerate those findings for Reiki to have value as a personal practice.For me, Reiki is about creating a space where you can slow down, reconnect with yourself and become more intentional about your own well-being. Sometimes, giving ourselves that space is meaningful in itself.
Reiki is a complementary wellness practice and is not intended to diagnose, treat, cure or prevent medical or mental-health conditions. It should not replace care from a qualified healthcare professional.
Research referenced: NCCIH overview of Reiki · 2026 surgical-care meta-analysis · 2024 anxiety meta-analysis · 2025 quality-of-life meta-analysis · Cancer pain systematic review