A<unk>  is a synthetic<unk> –androgenic steroid (AAS) that features an alkyl group, specifically a methyl or ethyl group, at the C17α position. Unlike many other AAS,<unk><unk>  AAS are orally active and do not require intramuscular injection. However, they uniquely possess a high potential for hepatotoxicity, which simultaneously limits their use. In addition, some have a high risk of gynecomastia due to uniquely high estrogenic activity, although this does not apply to<unk><unk>  AAS that are also 4,5α-reduced or 19-demethylated (i.e., that are also dihydrotestosterone (DHT) or nandrolone derivatives, respectively). The prototypical example of a<unk><unk>  AAS is methyltestosterone <unk> -methyltestosterone).
17α-Alkylated anabolic steroid
Thyroid blocker
Antiandrogen
Phytoestrogen
Anabolic steroid
Nonsteroidal antiandrogen
Antiestrogen
Estrogen conjugate