Picture two people in separate rooms, one sending Reiki at a distance and the other simply waiting, with an electroencephalogram running on each. The appealing hypothesis is that their brainwaves would drift into the same rhythm, a measurable sign of connection. It is a vivid image. The evidence does not support it.
Start with distant Reiki on its own. A 2008 systematic review of randomized trials by Lee and colleagues concluded that the evidence was insufficient to show Reiki works for any condition, leaving its value unproven. Reviews of distant healing more broadly have found mixed and methodologically weak results, with the better-controlled studies tending toward no effect. When people cannot see or sense the practitioner, the reported benefits shrink.
Then there is the brainwave-synchronization part, which is a stronger claim still. Asserting that two separated nervous systems lock into the same EEG pattern through Reiki would require careful, replicated, controlled measurement. That work has not been published. There is no credible dataset showing practitioner and recipient brainwaves synchronizing across distance. Treating it as established would mean inventing findings that do not exist.
What can be said honestly is narrower and more human. People who sit quietly with the intention to relax often do relax, and slow breathing or restful attention can shift a person’s own brain activity in familiar ways. That is one nervous system responding to calm, not two nervous systems syncing through space. Shared belief, ritual, and expectation can make a distant session feel meaningful to both people without any signal passing between them.
The relaxation is genuine. The sense of connection can matter to those involved. Neither requires, nor demonstrates, brainwave synchronization at a distance.
Anyone weighing this should hold the line between a comforting experience and a physical claim. Distant Reiki may be experienced as soothing, and that experience is real for the person having it. A measurable meeting of two brains across separate rooms is a different assertion, and on current evidence it stays unsupported. Reiki of any kind is best understood as a possible complement to care, never a substitute for medical treatment.