Currently, carnosine has shown anti-aging effects in Drosophila flies   and senescence-accelerated mice.   The first mice study noted that a 50% survival rate was increased by 20% in animals treated with carnosine. This increase in median lifespan was replicated in the second study, which used an oral dose of carnosine (100 mg/kg/day, which correlates to a little over 8 mg/kg/day in humans, so about 725 mg/day for a 200-lb subject). Both mice studies only noted an increase in median lifespan, with no change in maximum lifespan.
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 steroid 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.