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Jan. 6, 2000 (Atlanta) -- Seen those advertisements about the body-building effects of the popular supplementsDHEA and androstenedione? Don't buy them. Contrary to some previous studies and a lot of industry hype, a new study in the December issue of Medicine and Science in Sports and Exercise finds they are ineffective.

Among those disappointed with the study's findings -- its lead author. "I was hoping for more," M. Brian Wallace, PhD, director of research, applied physiology, and nutrition at LGE Performance Systems of Orlando, Fla., tells WebMD. What Wallace got instead was statistical proof refuting claims that using DHEA or androstenedione, commonly called "andro," leads to increased lean body mass and a decrease in body fat.

Forty middle-aged men with more than a year's experience in weight training participated in the study. Their ages ranged from 40 to 60 -- an age group that should have benefited most from using the supplements, since natural production of these hormones drops off steadily after young adulthood, according to the researchers.

The men were assigned to three supplementation groups. For a period of three months, one group took a daily dose of androstenedione, another group received a dose of DHEA, and a third group got a placebo. All the men continued their usual exercise and dietary regimens during this time.

Wallace says that theoretically both androstenedione and DHEA should have increased lean body mass at the expense of fat, because they are transformed in the body to the male hormone testosterone. But there was little change in muscle mass or body fat content using either supplement. There also was no significant change in muscular strength, based on how much the men could bench and leg press. And their aerobic capacity didn't change much, either.

At the dosage used in the study -- 100 mg per day -- the researchers found no significant side effects at the end of the study.

"I think the big problem with the study is the low dose used [100 mg]," says Cathy Fomous, PhD. "Typically, weightlifters take 500-1200 mg a day. It seems to me they didn't really test a realistic situation."

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