What does it take to be a major league baseball player? Great hand-eye coordination, lots of power and a bottle of androstenedione or creatine. At least that's what the manufacturers of these dietary supplements would like you to believe. Just look at Mark McGwire, who took both substances last year and cranked out a record 70 home runs. And Sammy Sosa, who took creatine and came in second in the great slugfest of 1998. They must know something the rest of us don't.
Then again, maybe not. In separate reports last week, scientists cast doubt on the ability of either substance...
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