Andropause is caused by the natural decline of Testosterone in men.
Testosterone is the primary male sex hormone. It is what makes a man, a man. It helps males grow larger muscles, have facial and body hair and develop deep voices. Testosterone also fuels the libido, helps to produce sperm and contributes to functional erections.
Testosterone also directly affects bone density, metabolism of salts, maintains fluid balance, regulates red blood cells, cholesterol profiles and manages different functions of the brain including energy levels, moods, and cognitive functions. It is what keeps you feeling young and vital.