What are normal testosterone levels by age? An older photographer mentors a younger one. Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical ...

There are no official numbers for the optimal levels of testosterone, but certain medical laboratories use the following reference values for typical total serum testosterone, measured in nanograms ...

Three forms of testosterone are found in serum: sex hormone-binding globulin (SHBG)-bound (60%-70% of total), albumin-bound (20%-30% of total), and free (1%-3% of total). SHBG-bound testosterone is ...

DEAR DR. ROACH: Television is full of ads touting testosterone and other body supplements that are supposed to take a 40-something male and turn his body back into a 20-year-old again. Their spokesmen ...

The standard cutoff point for low testosterone levels may not be accurate for men in their mid-forties and younger, reports a study in The Journal of Urology ®, an Official Journal of the American ...