Stamina will also improve with Trenbolone. Not just your physical, cardiovascular stamina – but also the strength of your muscles. They won’t get tired as quickly as they have in the past. Muscles will stay strong and power you through the workouts and competitions. You’ll recover quickly between workouts, meaning you can decide how much rest you want and whether you’re ready to get back to the gym and start lifting again. Trenbolone gives you more freedom and flexibility in your workouts; you don’t have to wait for the soreness or the swelling to subside. You’ll be recovered and ready to go because the endurance of your muscles has been increased.
Other significant adverse effects of testosterone supplementation include acceleration of pre-existing prostate cancer growth in individuals who have undergone androgen deprivation; increased hematocrit , which can require venipuncture in order to treat; and, exacerbation of sleep apnea .  Adverse effects may also include minor side-effects such as acne and oily skin, as well as, significant hair loss and/or thinning of the hair, which may be prevented with 5-alpha reductase inhibitors ordinarily used for the treatment of benign prostatic hyperplasia , such as finasteride .  Exogenous testosterone may also cause suppression of spermatogenesis , leading to, in some cases, infertility.  It is recommended that physicians screen for prostate cancer with a digital rectal exam and prostate-specific antigen (PSA) level before starting therapy, and monitor PSA and hematocrit levels closely during therapy.