Methyltestosterone

Methyltestosterone (brand names: Android, Androral, Oraviron, Testred, Virilon), also known as 17α-methyltestosterone, is a 17α-alkylated anabolic steroid used to treat males with a testosterone deficiency. It bears close structural similarity to testosterone, but has a methyl group at C17 in order to increase oral bioavailability. Due to aromatization to the metabolization-resistant estrogen 17α-methylestradiol, methyltestosterone has relatively high estrogenicity and hence side effects such as gynecomastia.