I asked Dr. Jay Hoffman, Professor and Chair of the Department of Health and Exercise Science at the College of New Jersey,  about the theory that sports supplements are a gateway to anabolic steroid use. He replied in an email:

I do not believe that this is the case. There really isn’t any documented evidence to support such a claim. Although all anabolic steroid users I would venture to guess use sport supplements – I do not necessarily support the hypothesis that increasing supplement use would increase anabolic steroid use.

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