It's no secret that anabolic steroids (., drugs that mimic testosterone) build muscle mass. However, existing supplements that claim to boost testosterone, like Tribulus Terrestris, D-Aspartic Acid, Eurycoma Longifolia and Fenugreek, have no scientific support proving that they are anabolic agents in young and healthy men. Even if they do boost testosterone slightly, the effect is not great enough in magnitude or duration to cause muscle growth. A much better approach than using alleged testosterone boosters is to train harder, sleep more and eat more high-quality food (and take creatine, protein and HMB).
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.