Systemic retinoid. Acitretin, the active ingredient of the drug – aromatic synthetic analog of retinoic acid. In preclinical studies of tolerance acitretin mutagenic or carcinogenic effects have been detected; there were no indications as to its direct hepatotoxicity. Acitretin what is trenbolone acetate exerted on the animals marked teratogenic effects. Clinical studies have confirmed that in psoriasis and disorders of keratinization acitretin normalizes processes of proliferation, differentiation and keratinisation of epidermal cells, and its side effects are generally well tolerated. The drug is purely symptomatic; its mechanism remains largely unknown….
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.