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 Testosterone Replacement Therapy
http://www.harvardprostateknowledge.org/a-harvard-expert-shares-his-thoughts-on-testosterone-replacement-therapy