US government probes chelation-heart disease study

"The largest alternative medicine study the U.S. government has ever launched has stopped enrolling people while officials investigate whether participants were fully informed of the risks and are being adequately protected, The Associated Press has learned. More than 1,500 heart attack survivors are involved in the research, which tests a controversial treatment called chelation. It is mainly used to treat lead poisoning. More than two people have died, although the Miami doctor leading the study said the deaths were not a direct result of the treatments. He said he doesn't know exactly how many deaths have occurred"