Low testosterone (T) symptoms may include low sex drive, erectile dysfunction, fewer sexual thoughts, mood problems, fatigue, loss of muscle, poor concentration, sleep disturbances, and fewer morning erections. Low T is also associated with several chronic medical conditions, including obesity, diabetes, osteoporosis, depression, and cardiovascular disease.

Men who get treated for low T have a very positive experience. The changes in appearance and mental state can be very profound. Interestingly, these positive changes associated with T therapy, have been found to occur at different times. A study from the University of Koln in Germany analyzed the relationship of time following administration vs. the effects on sexual functioning and mood on forty subjects. Researchers found sexual thoughts and fantasies occurred within weeks of initiating T therapy. Total number of erections rose steadily and peaked at 9 weeks. Ejaculations per week steadily rose and plateaued over 12 weeks. Depression decreased gradually and leveled off at 6 weeks. Mental concentration improved within the first 3 weeks, but overall mood did not improve until weeks 6 – 9.
The Aging Male 2009, 12: 113-118