Very interesting decision from the one of the leading scientific publications to publish an article about Reiki therapy.
http://www.nature.com/news/consider-all-the-evidence-on-alternative-therapies-1.18547
[Edit: should be Nature publishes an article about alternative therapy]
The article isn't so much about Reiki as about intentionally utilizing the placebo effect in medicine. And that there is some evidence that, for the group of people that currently believe (medicine x) is effective, the placebo effect of fake (medicine x) may be stronger than that of fake (medicine y) and (medicine x) has fewer medically significant side effects than (medicine y).
Placebo doesn't affect objective outcomes anyway.
See Orac for a bitter "discussion" about this article. http://scienceblogs.com/insolence/2015/10/15/in-the-pages-of-nature-a-full-throated-defense-of-integrating-quackery-into-medicine/