Men you are wired to perform. Wired for strength. Wired to protect. Your chemical makeup drives your body to succeed and you have testosterone to thank for that! Testosterone is the primary male sex hormone responsible for sex drive, semen volume, hair loss, bone mass, body fat, red blood cell production, and overall mood. We can all agree that testosterone plays a major role in a man’s day-to-day productivity and overall well-being. Testosterone is also the primary hormone that has a direct effect on skeletal muscle tissue. It promotes growth hormone responses which directly impact the size and potential strength of a muscle.