Minnesota Vikings running back Adrian Peterson emphasized that he's completely clean and doesn't use performance-enhancing drugs.

He doesn't believe the same statement can be made about all of his colleagues around the league when it comes to HGH, which the NFL is attempting to implement a testing program.

"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 told Minnesota reporters. "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."

And Peterson has heard a lot of feedback via social media accusing him of using HGH to make it back to earn Most Valuable Player honors last season only nine months after undergoing a serious knee procedure.

"[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.'"

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Aaron Wilson covers the Ravens for The Baltimore Sun