MORE: "The government is preparing major studies of substances that offer the hope of slowing the progression of Parkinsons disease instead of just treating its symptoms. First on the list is an over-the-counter dietary supplement.The National Institutes of Health is finalizing plans to enroll hundreds of early-stage Parkinsons patients in a study of super-high doses of coenzyme Q-10, or CoQ10, the agencys neurology chief announced Thursday.Some scientists theorize that CoQ10, a compound made in the body, may help preserve the nerve cells that die off in Parkinsons.An old antibiotic and a muscle-related supplement often used by bodybuilders are the next two candidates for a similar study. Preliminary research released on Thursday suggests that they, too, just might offer a chance at slowing Parkinson%u2019s.That is a tantalizing but still elusive goal for the 1.5 million people in the United States and 6 million people worldwide who have Parkinsons."