Testosterone is generally produced within the human body. For men, this hormone is produced in the testicles, which stimulates the production of sperm as well as man’s sexual drive and also helps in building bone and muscle mass. It has been seen that the testosterone level in men decreases after the age of 35, or after becoming a father. Now the question arises is that why the testosterone level decreases, is there any way to increase its level. There are natural ways by which one can increase its level.