A research study at Hartford Hospital in Hartford, Connecticut indicates that Reiki improved patient sleep by 86 percent, reduced pain by 78 percent, reduced nausea by 80 percent, and reduced anxiety during pregnancy by 94 percent.
In 2009, The Center for Reiki Research completed the Touchstone Project, which summarized Reiki studies published in peer-reviewed journals. The 25 studies examined were further evaluated to determine the effectiveness of Reiki. The conclusion states: "Overall, based on the summaries of those studies that were rated according to scientific rigor as "Very Good" or "Excellent" by at least one reviewer and were not rated as weak by any reviewer, 83 percent show moderate to strong evidence in support of Reiki as a therapeutic modality."