Performance-enhancing drugs (PEDs) are an issue in both high-school and professional-level football. Steroid use has been linked to an increased risk for musculoskeletal injuries among players. Human growth hormone (HGH) is used by some players to improve performance, recover from injuries, decrease aging, and to lose weight. Although none of these uses are scientifically proven or legal, HGH places users at risk for adverse side effects such as onset of diabetes and negatively impacting joints and organs such as the heart. However, there have been no studies of HGH use or the baseline levels of the hormone in NFL athletes. NFL players are routinely subject to drug tests in accordance with the NFL's two substance policies. Players found using performance-enhancing drugs, including anabolic steroids, can face suspension and other penalties. As of 2014, the league does not test for HGH use among players.