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Peterson says players using HGH

Minnesota Vikings running back Adrian Peterson responded to speculation that his rapid recovery from knee surgery was aided by human growth hormone by saying he is clean but adding that he believes NFL players are using HGH.

Peterson came back in nine months from ACL surgery last year to rush for more than 2,000 yards. He has seen the chatter on social media accusing him of using performance-enhancing drugs and is aware of the Twitter handle @HGHPeterson.

He wants the NFL to start testing for HGH.

"(Testing) will bring a lot of people to light," Peterson said. "It'll clear a lot of people, on the outside, their curiosity when it comes to different players. So I'm all-in for it. I don't worry about those types of supplements, using those, because I'm all natural.

"I work hard. This right here, it's a test for me personally that I know that, 'Hey, I'm clean as a whistle,' and other guys as well. And then, like I say, it'll bring some guys to the forefront and be like, 'Hey, I guess this is how this guy's been performing so well.'"

Peterson suggested that players will try anything to secure their jobs and make a living.

"You've got HGH, something that doesn't show up on a test, and you've got guys out there trying to provide for their families," Peterson said. "They're going to try to get that edge, get that advantage, especially if they're not worried about trying to get caught. Yeah, it's being used."