What is testosterone and the importance of it?

Testosterone: Testosterone is a vital hormone found in both males and females. It is the masculinizing hormone and is what changes fetuses from female to male in utero. Testosterone affects energy. Those with too low of levels are fatigued, sluggish, depressed. They often have sleep issues. They also may have low sperm production and low libido. They very well may have an inability to maintain an erection.