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After I turned 60, a routine checkup showed that I had lower-than-normal free testosterone levels. I hadn\u2019t noticed anything that would have alerted me. No symptoms. No indication. Everything worked well. But it nagged at me. I knew testosterone did much more for a man\u2019s health than just \u201cbuild muscle\u201d\u2014which I had no real interest in at this point\u2014so I decided to explore TRT, or testosterone replacement therapy.

(This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)