Cholesterol is a key building block for testosterone. Through a process called steroidogenesis, cholesterol sets the stage for testosterone creation in the Leydig cells found in the testes.

"For about three months, I felt superhuman. It was great," one TRT user said.

Dear T.B.: Although I am never fond of insurance companies making medical decisions, this does make sense from physiology. Cholesterol is made in the body, mostly in the liver and mostly at night ...

It's natural for testosterone to fluctuate, but sleep, diet and other factors can affect a man's levels on a daily basis.

Make sure the number on a testosterone check opens a real evaluation of health instead of becoming a shortcut to a prescription, Dr. Jamin Brahmbhatt advises.

Cholesterol often gets a bad reputation, but the story is more nuanced than "cholesterol = bad." Sure, too much LDL cholesterol in your blood can be harmful for your heart, but the cholesterol your ...