Testosterone is the primary male sex hormone and anabolic steroid.
Low levels of testosterone cause, decreased sex drive, less body hair, thinner bones and etc.
Testosterone is the key male sex hormone that regulates fertility, muscle mass, fat distribution, and red blood cell production.
In men, testosterone is thought to regulate a number of functions alongside sperm production. These include:
1. Sex Drive
2. Bone Mass
3. Fat Distribution
4. Muscle Size and Strength
5. Red Blood Cell production