Testosterone levels peak during male puberty and decline with age in both males and females. With low testosterone in males, you can have a decreased sex drive, trouble with erections, and low sperm ...

Boys conceived using intra-cytoplasmic sperm injection (ICSI) have lower serum testosterone levels than their naturally conceived counterparts, according to a recent study from Denmark where 1.5% of ...

As males age they experience a natural and gradual decline in testosterone, and research has established a relationship between low levels of the hormone and increased incidence of type 2 diabetes. In ...