Scientists have found that although testosterone is in charge of the development, differentiation and growth of cells too much of it could be lethal.

It has been found that too much testosterone could cause brain cells to self-destruct and lead to dementia similar to the Alzheimer's disease.
This new finding explains why long use steroid that turns into testosterone causes behavioral changes like aggressiveness and suicidal tendencies.
Scientists warn those men who are thinking about taking testosterone supplements to think twice before doing so. Although such products may aid in building muscular mass it could cause your brain to die and then the muscular mass wouldn’t matter.