The following link: CHIROPRACTIC-AN INTRODUCTION provides you access to a six page brochure published by the National Center for Complementary and Alternative Medicine (NCCAM) which is the Federal Government's lead agency for scientific research on complementary and alternative medicine ( CAM). It is just 1 of the 27 institutes and centers that make up the National Institutes of Health (NIH) within the U.S. Department of Health and Human Services.