The NFL released a statement on Monday saying that after a seven-month investigation into allegations made in a documentary produced by Al-Jazeera America, it found "no credible evidence" that Peyton Manning used HGH or any other performance-enhancing drugs.
In its documentary, released in December, Al-Jazeera used former British sprinter Liam Collins to go undercover to try to expose PED use by athletes. Collins spoke at length with a supplement salesman named Charlie Sly, who claimed he worked with Manning at the Guyer Institute, an anti-aging clinic in Indianapolis following Manning's 2011 neck surgery, and that the Guyer Institute sent HGH to Manning's wife, Ashley.
Manning, who retired about a month after his Denver Broncos beat the Carolina Panthers in Super Bowl 50, vehemently denied the allegations. Meanwhile, Sly -- who was recorded by Collins without consent -- later recanted his claims.
The NFL did not release all the details of its investigation, but it explained in its statement that both Mannings were "fully cooperative" with the investigation. They agreed to interviews and provided access "to all records sought by investigators," the NFL said.
The league did say that its investigation was led by the NFL's security and legal teams with "support from expert consultants and other professionals."
"The investigation involved witness interviews," the NFL said, "a review of relevant records and other materials, online research, and laboratory analysis and review."
Al-Jazeera's documentary implicated several other NFL players, including Steelers linebacker James Harrison, Packers linebackers Clay Matthews and Julius Peppers. The league said that its separate investigations into those claims are ongoing.
The NFL Players Association released the following statement regarding Manning:
As a former player, Peyton Manning is free to do whatever he believes is in his best interest. The Union knows that he understands the rights of players under the Collective Bargaining Agreement and would never do anything to hurt or undermine active players in support of those rights.