http://nccam.nih.gov/clinicaltrials/factsheet/index.htm
National Center for Complementary and Alternative Medicine, National Institutes of Health
A clinical trial is a research study in which a treatment or therapy is tested in people to see whether it is safe and effective. The National Center for Complementary and Alternative Medicine (NCCAM) explores complementary and alternative healing practices through carefully selected, designed, and conducted clinical trials.