"This study is important because testosterone products have been marketed for many years as treatments for a variety of conditions," said Evan C. Hadley, M.D., director of NIA's Division of Geriatrics and Clinical Gerontology, which is the primary funder of the trial. "We hope this trial will establish whether testosterone therapy results in clear benefits for older men."

Recruitment of study participants began in October of 2009. Men age 65 and older who are interested in participating should call the site closest to them. Men living within a 50-mile radius of the study centers, listed below, are especially encouraged to participate.

Participating institutions and their phone numbers include:

University of California, Los Angeles; 310-222-5297 University of California, San Diego; 877-219-6610 Boston University; 617-414-2968 University of Pittsburgh; 800-872-3653 Albert Einstein College of Medicine, Bronx, N.Y.; 718-405-8271 Baylor College of Medicine, Houston, Texas; 713-798-8343 University of Minnesota, Minneapolis; 612-625-4449 Yale University, New Haven, Conn.; 203-737-5672 University of Alabama at Birmingham; 205-934-2294 University of Washington, Seattle; 206-768-5408 Northwestern University, Evanston, Ill.; 877-300-3065 University of Florida, Gainesville; 866-386-7730, 352-273-5919

Additional information about the study is available at www.ttrial and at clinicaltrials/ct2/show/NCT00799617.

Source: University of Pennsylvania School of Medicine