http://nccam.nih.gov/chelation/q-and-a.htm
National Center for Complementary and Alternative Medicine, National Institutes of Health
The Trial To Assess Chelation Therapy (TACT) is the first large-scale, multicenter study to determine the safety and efficacy of EDTA (ethylene diamine tetra-acetic acid) chelation therapy for individuals with coronary artery disease. The questions and answers in this fact sheet provide additional information on coronary artery disease, EDTA chelation therapy, and the study.