12:53.60 Bernard Lagat (Nike) 07/22/11
12:54.12 ——Lagat 06/04/10
12:55.53 Chris Solinsky (Nike) 08/06/10
12:56.27 Dathan Ritzenhein (Nike) 08/28/09
12:56.45 ——Solinsky 08/19/10
12:56.66 ——Solinsky 06/04/10
12:58.21 Bob Kennedy (Nike) 08/14/96
12:58.56 Matt Tegenkamp (Nike) 09/04/09
12:58.75 ——Kennedy 07/08/96
12:58.90 Galen Rupp (Oregon TC) 06/02/12
30% of the top US ten 5000m times were achieved using hormone therapy. 40% of the top ten US marathon times were achieved using the same treatment. These usage numbers don't match usage numbers in the general public, let alone usage in males aged 20 - 30. Draw your own conclusions!