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What Is Reiki?
Reiki is a Japanese spiritual and complementary wellness practice that developed in the early twentieth century through the teachings of Mikao Usui. Reiki can be practiced with oneself or offered to another person, often through light touch or with the hands held just above the body. Depending on the lineage, Reiki practice may also include meditation, ethical precepts, formal initiation or attunement, and distance practice.
Within Reiki traditions, Reiki is commonly understood in terms of a spiritual or universal life-force energy. That traditional understanding is an important part of Reiki’s identity, while the existence and mechanism of a distinct Reiki energy have not been established scientifically.
Reiki in Brief
Reiki is often introduced as a hands-on healing practice, but that description captures only part of the tradition.
For many practitioners, Reiki is both an experiential practice and a way of cultivating awareness, presence, compassion, and self-reflection. Self-Reiki is a foundational form of practice in many lineages, while Reiki may also be offered to another willing person.
During a Reiki session, a practitioner may place the hands lightly on agreed areas of the body or hold them nearby without physical contact. The recipient’s comfort, preferences, and boundaries should guide whether and where touch is used.
Reiki traditions also include contemplative and ethical practices. The Reiki precepts, often called the Gokai, are an important example.
Reiki is broader than a treatment technique or a single type of session: self-practice, contemplation, ethical practice, and practice with others can all form part of the tradition.
What Does the Word Reiki Mean?
Reiki is commonly written in Japanese as 霊気. It is often explained in Western Reiki teaching by separating the word into Rei and Ki, but its meaning is more nuanced than a simple one-word translation of each character.
Rei · 霊
Rei can carry meanings associated with spirit, the spiritual or numinous, soul, or spiritual presence. Translating it simply as “universal” does not capture its full range of meaning.
Ki · 気
Ki is a broad Japanese concept whose meanings vary with context and can include ideas related to vitality, spirit, mind, mood, breath, atmosphere, and the East Asian concept often translated as vital energy.
Within modern Reiki traditions, “universal life-force energy” became a widely used way of expressing the spiritual understanding of Reiki. It is best understood as an important Reiki-tradition interpretation rather than the only possible linguistic meaning of the Japanese word.
What Does Reiki Practice Involve?
There is no single way every Reiki lineage practices. Methods have developed over time, and different teachers may emphasize different aspects of the tradition.
Self-Reiki
Reiki can be practiced with oneself. Self-Reiki may involve resting the hands on or near different areas of the body while maintaining quiet, attentive presence. For many practitioners, personal practice is central to Reiki rather than merely preparation for working with other people.
Reiki With Another Person
When Reiki is offered to another person, the practitioner generally works with the hands lightly touching agreed areas or held a short distance above the body. Reiki should be offered with consent and respect for personal boundaries. A person may prefer some touch, no touch, or may choose to stop a session at any time.
Practitioners may use structured hand placements, a more responsive or intuitive approach, or a combination of both. Methods vary by lineage and practitioner.
Distance Reiki
Some Reiki lineages also include practice in which the recipient is not physically present, commonly called Distance Reiki. Its traditions, methods, and evidence questions deserve separate consideration rather than assuming it functions identically to an in-person session.
Reiki as a Practice for Daily Life
Reiki historically includes more than offering sessions.
The Gokai, or Reiki precepts, form an ethical and contemplative part of the practice associated with Usui’s tradition. English translations vary, but recurring themes include how we relate to anger and worry, gratitude, integrity in daily responsibilities, and kindness toward others.
Rather than functioning as medical instructions or rigid religious commandments, the precepts can be approached as prompts for daily reflection and practice.
For this reason, many practitioners understand Reiki not only as something they “do” during a session, but as a practice that can influence how they meet ordinary life.
A short reflection on the Reiki precepts used in Biofield Transformations Reiki training.
How Reiki Developed
The system now known as Usui Reiki Ryōhō emerged in Japan in the early twentieth century and became publicly established during the 1920s.
Public-domain photograph via Wikimedia Commons.
Mikao Usui
Mikao Usui (1865–1926) is the historical figure most closely associated with the development of Usui Reiki Ryōhō.
An important early source is the memorial erected after Usui’s death by members of his organization. The memorial recounts that Usui undertook a period of fasting and spiritual discipline on Mount Kurama, traditionally described as lasting twenty-one days, and experienced something that became central to the Reiki origin tradition.
The account has longstanding importance within Reiki history. At the same time, the spiritual meaning of such an experience belongs to the tradition and is not something historical research can independently verify.
Source note: Material commonly published today under titles such as The Original Reiki Handbook of Dr. Mikao Usui contains important early Reiki material alongside later editorial and research material. Biofield Transformations therefore does not treat the modern published volume as one continuous text written entirely by Usui.
Chujiro Hayashi
Chujiro Hayashi, one of Usui’s students, became an important figure in the development and systematization of Reiki treatment practice. His work also formed a critical bridge in the transmission of Reiki to Hawayo Takata, whose teaching would profoundly influence how Reiki developed outside Japan.
Hawayo Takata and Reiki’s Wider Transmission
Hawayo Takata, a Japanese American woman from Hawai‘i, trained in Reiki with Hayashi in Japan during the 1930s and was already practicing Reiki in Hawai‘i before the Second World War.
That chronology matters because Reiki is sometimes described as having first reached the West only after World War II. Historical scholarship instead shows an earlier trans-Pacific movement between Japan and Hawai‘i.
Takata later became one of the most influential figures in Reiki’s wider transmission through Hawai‘i and North America. Her teaching network played a major role in the international spread of Reiki and in the development of forms of Reiki familiar to many practitioners today.
Historical context: Key sources for this section include Justin B. Stein’s Alternate Currents: Reiki’s Circulation in the Twentieth-Century North Pacific (University of Hawai‘i Press, 2023) and the Hawayo Takata Papers held by UC Santa Barbara Special Research Collections.
Lineage, Variation & Provenance
Reiki did not remain completely unchanged after Usui. Hayashi, Takata, later teachers, and multiple Japanese and international lineages transmitted, organized, interpreted, and adapted elements of practice in different ways.
This is one reason lineage and provenance matter.
In Reiki, lineage describes a teacher-to-student line of transmission. Understanding lineage can help clarify where particular practices came from, which teachings are associated with earlier Japanese Reiki, which developed through Hayashi or Takata, and which are lineage-specific or contemporary additions.
Lineage does not prove that Reiki is clinically effective. Its value is historical and educational: it helps distinguish provenance rather than presenting every modern Reiki practice as though it came directly from Mikao Usui.
Biofield Transformations documents Diana Dodds’s Reiki lineage and training standards while recognizing that one transmission line is not the only Reiki lineage.
Reiki and the Biofield
Reiki is commonly classified in contemporary research literature as a biofield therapy.
Biofield therapies are a research category that includes approaches such as Reiki, Healing Touch, Therapeutic Touch, and External Qigong. Current clinical-trial reporting guidance specifically includes Reiki within this family of practices.
Classification as a biofield therapy does not, by itself, establish how Reiki works or demonstrate a particular biofield mechanism.
In particular, the classification does not mean that science has demonstrated that a practitioner transfers a specific measurable energy field, that traditional Reiki energy has been physically identified, or that one particular mechanism has been established.
The relationship among biological fields, subtle-energy traditions, consciousness, physiology, and therapeutic interaction remains an active area of investigation.
EVIDENCE & RESEARCH
What Does Science Say About Reiki?
Reiki is being actively studied.
Recent research includes randomized and sham-controlled clinical trials, systematic reviews, and meta-analyses examining outcomes such as anxiety, stress, pain, and quality of life. A 2024 meta-analysis involving 824 adults reported a pooled reduction in anxiety favoring Reiki, although results varied across populations and intervention patterns.
A 2025 meta-analysis of randomized controlled trials also reported a small pooled improvement in quality of life. A broader 2025 scoping review identified hundreds of human studies of biofield therapies, including 88 Reiki studies, while emphasizing the importance of distinguishing the existence of a research literature from proof of effectiveness.
Other studies have produced mixed or nonsignificant findings, and important limitations remain. Reiki studies vary in population, sample size, intervention length, practitioner training, comparison groups, blinding methods, and use of sham Reiki.
So, is Reiki scientifically proven?
Not in the sense of having a universally established clinical effect or a confirmed biomedical mechanism.
But that is different from saying Reiki has not been studied or that there is no evidence worth examining. The evidence base is evolving, and some recent findings are promising enough to warrant continued rigorous investigation.
The U.S. National Center for Complementary and Integrative Health currently takes a more cautious position, noting that Reiki has not yet been clearly demonstrated to be effective for a health-related purpose and that existing research has important quality and consistency limitations.
At present, scientific research also has not established that the traditional concept of Reiki energy is a measurable causal mechanism. Clinical outcomes, when observed, should therefore not automatically be treated as proof of a particular energetic, nervous-system, immune, quantum, or biophotonic explanation.
Biofield Transformations follows the research as it develops, including supportive, mixed, null, contrary, and emerging findings while keeping clinical outcomes separate from proposed mechanisms.
Selected research: Liu and colleagues, 2024 meta-analysis of Reiki and anxiety; Liu and colleagues, 2025 meta-analysis of randomized trials and quality of life; the 2025 Biofield Therapies Clinical Research Landscape scoping review; and the U.S. National Center for Complementary and Integrative Health Reiki overview.
What Might You Experience?
There is no single experience a person is supposed to have during Reiki.
Some people describe feeling deeply relaxed, warm, quiet, heavy, light, or tingling. Others describe emotional responses, imagery, a sense of spiritual connection, or simply a period of rest.
Some people notice very little.
None of these experiences, by themselves, proves that an illness has been healed, an energy blockage has been removed, a chakra has changed, or a particular physiological process has occurred.
Likewise, not noticing dramatic sensations does not mean that someone has experienced Reiki incorrectly. Individual experience is personal and variable.
What Reiki Is — and Is Not
Reiki can be approached as a spiritual and complementary wellness practice while maintaining clear boundaries around what it does and does not represent.
Spiritual, Not a Required Religion
Reiki can have spiritual meaning, but practicing or receiving Reiki does not require adopting a particular religion or belief system.
Complementary, Not a Replacement for Care
Reiki is not medical or mental-health diagnosis or treatment. It should not replace appropriate professional care, prescribed medication, or emergency treatment.
No Guaranteed Experience or Outcome
Reiki does not guarantee a particular sensation, spiritual experience, or health outcome.
Tradition and Science Are Different Evidence Categories
Reiki’s spiritual framework can be respected without presenting every traditional explanation as established physiology. Historical tradition, personal experience, clinical outcomes, and proposed mechanisms each answer different kinds of questions.
Reiki involving another person should also respect willingness, autonomy, touch preferences, personal boundaries, and appropriate scope of practice.
Ways to Explore Reiki
Understanding Reiki can lead in different directions depending on what you are looking for. Continue with the path that best matches your question or interest.
Explore the Research
Go deeper into clinical studies, evidence quality, proposed mechanisms, biofield research, and areas where the science remains unresolved.
Learn Reiki
Explore Biofield Transformations’ documented Usui Reiki education pathway for developing a personal practice and progressing through structured training.
Experience Reiki
If you would prefer to experience Reiki with a practitioner before deciding whether you want to study it, explore the current Reiki services and personalized Remote Reiki offering.