In Piazza autobiography he admits using andro and amphetamines, denies using other substances-NY Times

2/9/13, "A Big Hitter’s Baseball Life, Without the Bombshells," NY Times, David Waldstein

page 2, "He admits to using androstenedione as part of a supplement pack until the outcry over Mark McGwire’s use of it forced him to “phase it out.” Baseball later banned the substance.

He also writes that he briefly experimented with amphetamines until they were banned in 2006. And he describes hearing about human growth hormone, doing some research and asking the Mets’ former trainer, Fred Hina, if teams would start distributing it, unaware that it was a banned substance. According to the book, Hina said he would look into it and a day or two later told Piazza it was not a good idea."...

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