New research suggests that one out of four men over 30 have low testosterone levels, but only one out of every 20 men have clinical symptoms linked to such a deficiency.
As men age, they are more likely to experience symptoms such as lack of sex drive and erectile dysfunction as a result of low levels of testosterone, the researchers explain.
Low testosterone is defined as 300ng/dL (nanograms per deciliter) of total testosterone and less than 5 ng/dL of free testosterone. Free testosterone ...