Testosterone industry is a prominent segment of the pharmaceutical industry. Testosterone is a steroid hormone which exerts effects on the males throughout life. Testosterone is significant for maintaining muscle bulk, adequate levels of red blood cells, bone growth, a sense of well-being, and sexual function. Low testosterone may result in decreased sex drive, erectile dysfunction, depression and loss of muscle mass. The testosterone level starts falling as the age of the person increases. Many other factors like injury or loss of testicles, chemotherapy, genetic abnormalities, chronic diseases and alcoholism may also result in low level of testosterone. Testosterone directly impacts the endocrine system, reproductive system, central nervous system and circulatory system of the body.