Testosterone undecanoate, sold under the brand names Nebido, Aveed, and Andriol among others, is an androgen and anabolic steroid (AAS) medication which is used mainly in the treatment of low testosterone levels in men. It is also used in hormone therapy for transgender men. It is taken by mouth two to three times per day with food or given by injection into muscle once every 12 weeks or so.Testo…