The testicles and ovaries produce testosterone. Producing too little or too much testosterone can affect your physical and mental health. Testosterone is a hormone found in humans, as well as in other ...

Low testosterone levels in males can lead to erectile dysfunction. They can also affect sleep, mood, the size of the testicles, and more. In both males and females, low testosterone can lead to lower ...

Testosterone affects many aspects of your health, from sexual function to disease risk. You may be able to increase your levels naturally by lifting weights and getting more of certain nutrients.