Testosterone replacement therapy is rising in popularity. What is it and what are there risks?

Testosterone replacement therapy, which involves taking manufactured forms of testosterone, has surged in popularity.  Prescriptions for the treatment rose from 7.3 million in 2019 to more than 11 million last year.

"It's exploding," CBS News chief medical correspondent Dr. Jon LaPook said Tuesday on "CBS Mornings Plus." 

But the treatment, also known as TRT, carries health risks to be aware of.