Testosterone Undecanoate can have an effect on men. The main effects of Testosterone Undecanoate are: for the treatment of primary or secondary testicular hypoplasia, delayed physical puberty in boys, palliation of breast cancer metastases, adjuvant treatment of aplastic anemia, and partial androgen deficiency syndrome in middle-aged and elderly. If you want to improve the efficacy. This drug has side effects, such as: hirsutism, acne, abnormal erection of the penis, semen reduction; for adolescents can be a condition of precocious puberty; gastrointestinal discomfort. This medicine should not be used by patients with prostate cancer and breast cancer. Testosterone undecanoate is an androgen supplement, which can be metabolized in the body to produce androgens directly, so it has an effect on men. It is important to use this medicine under the supervision of a doctor to avoid adverse reactions.