Regardless of whether Peyton Manning used HGH, NFL players believe there is an HGH problem with the league

Players Bleacher Report spoke to estimated that somewhere in the range of 10 to 40 percent of current players use HGH. 

A player using HGH will only get caught "if the NFL gets really, really lucky, like win-the-Lotto-every-month lucky," said one player.

"The bodies of players are basically acting as chemistry sets," one veteran said. "What's going to happen to these guys five or 10 years from now?"

The NFL and union agreed to HGH testing in 2011. Testing did not begin until October 2014.