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|Section2= |Section3= }} 19-Norandrosterone is a nandrolone and 19-norandrostenedione metabolite. It is created as a byproduct of nandrolone via the 5-alpha reductase enzyme and is on the list of substances prohibited by the World Anti-Doping Agency since it is a detectable metabolite of nandrolone which is an anabolic steroid. Consumption of androstendione products contaminated with traces of 19-norandrostenedione also results in testing positive for nandrolone. Traces of 19-norandrosterone may be naturally present in human urine. An experiment conducted on athletes showed that after a prolonged intense effort, the 19-norandrosterone concentration can be increased by a factor varying between 2 and 4, but another study failed to replicate the result. Concentration also increases in the urine of female athletes during menstruation. The consumption of edible parts of a non-castrated pig, containing 19-nortestosterone, has been shown to result in the excretion of 19-norandrosterone in the following hours, so athletes should prudently avoid meals composed of pig offal in the hours preceding doping tests. Consumption of boar meat, liver, kidneys and heart also increased 19-norandrosterone output. 19-Norandrosterone is also the basic skeleton structure for a family of C18 steroidal compounds called "dehydronorandrosterones". ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「19-Norandrosterone」の詳細全文を読む スポンサード リンク
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