Heavy consumption of the essential amino acid lysine (as indicated in the treatment of cold sores) has allegedly shown false positives in some and was cited by American shotputter C. J. Hunter as the reason for his positive test, though in 2004 he admitted to a federal grand jury that he had injected nandrolone.  A possible cause of incorrect urine test results is the presence of metabolites from other AAS, though modern urinalysis can usually determine the exact AAS used by analyzing the ratio of the two remaining nandrolone metabolites. As a result of the numerous overturned verdicts, the testing procedure was reviewed by UK Sport . On October 5, 2007, three-time Olympic gold medalist for track and field Marion Jones admitted to use of the drug, and was sentenced to six months in jail for lying to a federal grand jury in 2000. 
Normally taken orally but some non-EU or US countries produce injectable versions. Its ability to increase muscle mass, harden the body and increase stamina has made it one of the go-to steroid choices for many a user – and it’s the one they use on racehorses to make them go faster. But many users report acne flare-ups and dry joints, and while it’s easy on the hairline, it’s hard on the liver. Warning signs of liver problems include abdominal pain, light-coloured stools, dark-coloured urine, unusual fatigue, nausea and yellowing of the skin or eyes. Brand names include Winstrol.