In many men aged 50 and over and most often in diabetic patients, symptoms such as a reduced muscle mass, a lack of energy, a decrease in strength and endurance and lower libido can be observed. These are some of the characteristic signs of hypotestosteronemia (lower level of testosterone in the blood). Through well controlled dosing and periodical follow-ups, it is possible to bring the level of testosterone in these patients to a more acceptable level and consequently to improve their quality of life.