Hormones play a vital role in the different processes of the body, such as growth and development, reproduction, metabolism and sexual function.  The pituitary, pineal, thymus, thyroid, adrenal glands, and pancreas produce the most of hormones in our body, but the testes (in males) and the ovaries (in females) produce the hormones in charge of sexual and reproductive function. Most hormone levels are not checked routinely since hormone levels tend to decline as you age, but if your hormone levels are low (such as testosterone, estrogen, or cortisol), there are numerous actions you can take to boost your levels and feel much better.
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 anabolic steroids, 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, five-time 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.