Steroid use is down among teenagers, but experts warn that young people are replacing it with a potentially dangerous booster. Researchers from the University of Michigan found that while anabolic steroid use among teens has significantly decreased over the past two decades, creatine use is surging. “I did this study given the rise in social media trends that glorify toxic gym culture, along with the rise in ‘looksmaxxers,’” said study author Philip Veliz.  While steroid use…