“…Among those, established target metabolites such as androst‐3,5‐diene‐7β‐ol‐17‐one were found but also newly identified features attributed to C‐2‐hydroxylated species such as androst‐5‐ene‐2α/β‐ol‐7,17‐dione, based on mass spectrometric information. With a single oral dose of 25 mg of arimistane, no significant effect on the tested persons' steroid profiles was observed; whether or not the continued use of synthetic isoflavones as “natural” aromatase inhibitors might necessitate consideration as confounding factors of the steroidal module of the ABP was discussed by Iannone et al 143 In order to enable anti‐doping laboratories to identify the administration of isoflavones and, if required, include the presence of these into ABP interpretations, elimination studies with methoxyisoflavone (450 mg per day, 3 days) and ipriflavone (200 mg per day, 3 days) were conducted, yielding eight and six tentatively identified metabolites, respectively. The most common metabolic reactions were dealkylation and hydroxylation, allowing for an unequivocal detection of isoflavone administration.…”