CAM research databases and indexes

CAM on PubMed
PubMed provides access to more than 28 million citations for biomedical literature from the database MEDLINE, life science journals, and online books. CAM on PubMed is a subset of PubMed citations that focus on CAM:

The leading bibliographic database of biomedicine administered by the US National Library of Medicine. The free online version is called PubMed.

The second largest biomedical database after Medline. Paid source.

One of the largest databases of certified information on biomedicine.
A database of clinical studies conducted in various countries, provided by the US National Library of Medicine:

CINAHL – Cumulative Index to Nursing and Allied Health Literature
A database of selected journal articles about nursing, allied health, biomedicine and healthcare, including CAM.

An online search engine for scientific literature run by Google Inc.

NCCIH Clinical Trials A–Z
The National Center for Complementary and Integrative Health’s (NCCIH) website with CAM references to the database of clinical studies:
An online service with links to various information about CAM from the website MedlinePlus, run by the US National Library of Medicine:

Cancer Research UK
Research on CAM and cancer care in the United Kingdom and internationally.

CAM Quest
A European-wide search portal for clinical CAM studies, possible to searched according to method and disease:

AMED Allied and Complementary Medicine
A database by the British Library that focuses on complementary medicine.

A literature database of complementary and alternative medicine provided by the Department of Medical Theory and Complementary Medicine at the Witten/Herdecke University in Germany.

Cochrane Complementary Medicine
A database of clinical CAM studies provided by the Center for Integrative Medicine at the University of Maryland.

Lists of research databases that also include research on CAM:

Probably the largest summary of scientific research on Reiki
It contains about 105 clinical studies and 33 published articles (December 2017).
See the PDF document Reiki – The Scientific Evidence.

Some other lists of research on Reiki:

A Czech list of scientific databases by the Centre of Scientific Information of the Institute of Physiology CAS: