Jane Says: Consider Where Your Eggs Are From, Not Their Color. A yolk is a yolk is a yolk is a yolk, regardless of its hue. Feed mixed with marigolds or paprika lends its tone to henâs eggs. (Photo: Mike Harrington/Getty Images)
The normal range of testosterone levels in healthy adult males is between 280 to 1,100 nanograms per deciliter (ng/dL), reports the University of Rochester Medical Center. Itâs important to determine if a low testosterone level is due to normal aging or if itâs due to a disorder.
Function of Testosterone. Testosterone is a sex hormone produced in the testes that stimulates the development of male sex organs, secondary sexual traits, and sperm. Testosterone in men peaks at age 30 and gradually decreases at a rate of about 1 percent per year.