Testosterone is the primary male sex hormone.
Testosterone is a vital male hormone that is responsible for the development and maintenance of male attributes like a deeper voice, beard and body hair. It also promotes muscle mass and sex drive.
It also can play a role in certain behaviours, including aggression and dominance.
Muscle, Fat and bone
Testosterone is one of many factors involved in the development of muscle bulk and strength. Testosterone increases neurotransmitters, which encourage tissues growth.
Testosterone increases levels of growth hormone. That makes exercise more likely to build muscle.
Testosterone also plays a role in fat metabolism, helping men to burn fat more efficiently.
Below are photos from 2011 through to 2019 of me pre T and now.