19-Norandrosterone
It is on the list of substances prohibited by the World Anti-Doping Agency since it is a detectable metabolite of nandrolone, an anabolic-androgenic steroid (AAS).[1] Consumption of androstendione products contaminated with traces of bolandione may also result in testing positive for nandrolone.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,[3] but another study failed to replicate the result.[5] 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.[6] Consumption of boar meat, liver, kidneys and heart also increased 19-norandrosterone output.