To increase testosterone levels depends on the cause of the decreased levels in testosterone, such as testicular lesions, pituitary lesions, hypothalamic lesions and other causes. 1. Testicular lesions: If the cause is due to testicular lesions, androgenic agents such as testosterone undecanoate can be taken to increase testosterone levels. 2. Pituitary lesions: If the pituitary gland cannot produce enough luteinizing hormone to stimulate the testes to produce testosterone, artificial supplementation of luteinizing hormone, such as chorionic gonadotropin injection, can increase testosterone levels. 3. Hypothalamic lesions: If the body lacks gonadotropin-releasing hormone, it will not activate the pituitary gland, and thus will not activate the testes. In this case, it is necessary to take gonadotropin-releasing hormone medications, such as goserelin, to stimulate the pituitary gland and testes, and to increase the level of testosterone. Note: All of the above medications should be used under medical supervision.