Yes he did, but later (and by "later" I mean age 40 and after) he maintained (and still does) a magnificent physique with training & diet only.
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there are many players in the mlb that use steroids. My guess would be 30-40.
Larry Scott won the first 2
40%
Mark McGwire announced January 11, 2010 that he used steroids for nearly a decade while playing baseball.
No. In fact there was quite a crackdown on steroid use, especially with soldiers serving in the Republic of Korea, where it was much easier to acquire anabolic steroids than in the US.