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Building Muscle After 40 Medical news Today: Do Testosterone and Growth Hormone Impact on Muscle Building http://www.medicalnewstoday.com/articles/246728.php MayoClinic: Performance Enhancing Drugs http://www.mayoclinic.com/health/performance-enhancing-drugs/HQ01105 Harvard Medical School: Testosterone and the Heart http://www.health.harvard.edu/fhg/updates/testosterone-and-the-heart.shtml Mercola: 9 Body Hacks to Naturally Increase Testosterone http://fitness.mercola.com/sites/fitness/archive/2012/07/27/increase-testosterone-levels.aspx International Society of Sports Nutrition Position Stand http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2117006/ Harvard: A Harvard Expert Expresses his Thoughts on … Read more