Testosterone is a hormone, which is present in both men and women but it is a lot higher in the men than in the women. This particular hormone is responsible for the male characteristics like a typically deep voice, sexual drive, muscles and sometimes aggressiveness. In the men it is found in the testicles and in the women it is found in the ovaries. Because of the muscle building program properties testosterone has, this is why it is used in many body building supplements. When you body bu